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Table of Content

    15 August 2013, Volume 42 Issue 08
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    Research on Mechanical Property and Failure Pattern of Rock Samples in Different Stress Conditions
    LUO Tao, GAO Yong-Tao, LU Hong-Jian
    2013, 42(08):  1-4. 
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    In order to research on the behavior law of mechanical property and failure pattern of rock samples in different stress conditions，rock samples were collected from four in-situ stress measuring points in a certain mine.Afterwards，combining with in-situ stress data，rock mechanics tests in different stress conditions were carried out.The research showed that weak rocks usually shows X-shear failure pattern and hard rock shows extension failure pattern in uniaxial compression test.With the increase of confining pressure，the failure pattern of rock samples changes into oblique-shear failure mode，the peak strength and the residual strength have been increased rapidly，especially，the residual strength grows fastest.Combining on-site stress conditions with mechanical test，it is concluded that the rock-burst in surrounding area of measuring point Wuhkang 1 was most impossible.
    Experimental Study on Upward Drift Stoping Method with Backfill in Xiaoguanzhuang Iron Mine
    QIU Jing-Ping, XIN Guo-Shuai, ZHANG Guo-Lian, XING Jun, SUN Xiao-Gang
    2013, 42(08):  5-7. 
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    In view of the mining conditions of the soft and broken lump ore，scattered distribution of ore in northern area of Xiaoguanzhuang Iron Ore，the upward drift mining with cementing filling is selected.Through the simulation analysis，the structural parameters of the upward drift are optimized: the drift height at 3.5 m，the drift width at 3.5 m，and the path length of 60 m.In the industrial trials，the filling mining technique is improved，and some measures for improving the roof-contact filling are proposed.And the quantity of mining preparation is reduced so as to realize the safe and efficient production of the testing lump ores.
    Prediction of Rock Caving Height and Ballast Stone Thickness Based on the Residuals G-LSSVM
    CHEN Shang-Bo, ZHANG Yao-Ping, XIA Yi-Jiang, TIAN Liu-Feng
    2013, 42(08):  8-10+15. 
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    Due to the complexity and randomness of the forming condition of the mined-out area and its change，the prediction accuracy for roof rock caving height and ballast stone thickness of the mined-out area by the traditional method is often lower.In this paper，combining with the advantages of various single forecasting methods based on artificial intelligence，a forecasting model of residual grey squares new support vector machine prediction model (G-LSSVM) is put forward and then applied to predicting the roof caving height and ballast stone thickness of an iron ore.The predicting results are very close to the actual drilling photography monitoring result.The tests show: the residual type G-LSSVM for predicting the covering caving height and ballast stone thickness is feasible and effective.
    Research on Engineering Geology and Exploitation Technical Condition of the Deposit in South Area of Sijiaying Iron Mine
    LI Gang, YANG Zhi-Qiang, GAO Qian, MA Yao
    2013, 42(08):  11-15. 
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    According to the stoping design requirements of the deposit with sublevel backfilling in South Area of Sijiaying Iron Mine，the research is carried out about engineering geological condition and exploitation technical condition of the mineral deposit.On the basis of ore-body's geologic structure and the characteristic analysis of the surrounding rock，the ore-body and surrounding rocks are classified，and the rock stability evaluation is made so as to determine the mechanical parameters of rock mass.Then，the spatial form and the grade distribution of deposit are shown by using the 3D geologic model of deposit which is built with use of the exploration and drilling data.Thus，By means of engineering experience and previous research results，the ground stress parameters of the ore district are preliminarily discussed.The research results lay a foundation for mining design with back-fill method and decisions optimization.
    Mine Pressure Behavior Law of Fully-mechanized Face in Complicated Geological Condition
    LI Yang, YANG Tian-Hong, LIU Hong-Lei, YAO Fei
    2013, 42(08):  16-19+23. 
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    Using the top dynamic monitoring system KJ216 of Uroica company，the mine pressure monitoring of the 1st east working face of the 13th seam axis working face in Da′anshan coal mine is made.Through analyzing the monitoring results，the mine pressure behavior law of fully-mechanized face having gently inclined seam with complicated geological structure is obtained，which ensures the safe mining of working face and provides the scientific basis for the similar face.The monitoring results show that the average first weighting length is 52.67 m，the average periodic weighting length is 22.12 m，the range of stress increasing in front of the face is 8~16.2 m and 5.2~13.6 m and the average peak of stress increasing is 24 MPa and 23.57 MPa as the pressure changes，and the mine pressure at the middle of the face is obviously higher than the upper and the lower part.
    Research and Practice of Ore Pillar Recovery Engineering in Mined-out Area of Tianmashan Sulfur-gold Deposit
    WU Jia-Ping, HU Yong-Quan
    2013, 42(08):  20-23. 
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    There are quantities of underground goaf in Tianmashan sulfur gold deposit，and lots of ore pillars are left in the goaf.In order to safely and effectively recover these parts of resources，through investigations on the geological environment and status of the mined-out area，and according to the ground pressure monitoring results，the numerical simulation method is adopted to demonstrate the new stoping scheme for the largest underground #1 ore pillar，which is implemented successfully.On the premise of ensuring the safety，good economic benefits with ore recovery of 82,000 t have been obtained，and the research provides experiences for the recovery of other pillars in this section as well.
    Study of Stage Stoping Sequence based on Flac3D Numerical Simulation Software
    YANG Yu-Xue, CHENG Hong, YANG Tian-Bao
    2013, 42(08):  24-26. 
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    With Fanshan phosphate mine as carrier，simulation on roof stress，displacement and other characteristics under different stoping sequences at two stages are carried out through Flac3D numerical simulation software.The stress value of the stope and surrounding rocks with the stage underhand stoping is less than that with the stage overhand stoping，which is beneficial to the stability of the stope.When adopting the stage underhand mining，the filling body from the upper stage is acted as the buffering body for the deformation of the overburden rocks at this stage，by which the deformation development is fully limited and the deformation of the overburden is reduced.
    Study on Permeability Problems of Filling in the Sandfill Mining Stope
    MAO Yan-Xin, DING Ling-Xiao, FENG Chao-Chao
    2013, 42(08):  27-30. 
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    Through researching on the permeability rules of back fillings in upper horizontal sublevel sandfill mining，a mathematical model for obtaining fillings dehydration time under various influences involving permeability coefficient，storage coefficient，thickness of back fill and the space of dehydration wells is established，then the homologous numerical program is complied with MATLAB.After then，the testing theory and methods in accurately predicting the coefficients of permeability and storage in laboratory are proposeed.On this basis，the numerical simulation for dehydration efficiency in the upper horizontal sublevel sandfill mining of Hongtoushan copper mine under different technical parameters is carried out，achieving the relationship curve between each parameter and the dehydration efficiency.
    Analysis of Detonation Shock Wave of Rich Water Hole Detonating Cord in Anqing Copper Mine
    WANG Hong-Tao, SUI Shao-Fei
    2013, 42(08):  31-33. 
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    Large-diameter deep hole in the VCR method of Anqing Copper Mine adopts the detonating cord blasting.In blasting process，some rich water holes are often met with.Even if the water in hole is handled by high-pressure wind before charging，water will be appeared soon.Therefore，the water hole blasting technology is needed.With the help of ANSYS finite element numerical simulation software，the detonating cord is blasted in air and water through numerical simulation.The calculation results indicate: the shock wave overpressure values produced in the water after explosion of detonating cord is greater than that in the air.After repeated reflection and overlay in the hole after firing，the maximum overpressure of the shock wave and the action time are all increased，resulting in a better blasting effect.
    Three-dimensional Numerical Simulation of Associated Well-type Roadway Arranged and Excavation Sequential Optimization
    CHEN Shun-Man, XU Meng-Guo, WANG Ming-Xu, WANG Ping, XU Zhao, LUO Kai
    2013, 42(08):  34-37+41. 
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    The excavation of the roadway sequence is the key factor to influence the stability of the surrounding rock，and three levels of local roadway model has been established by using the numerical simulation software.On two-level quasi roadway excavation is completed，through the quasi third level roadways is not boring and the mechanical characteristics of the surrounding rock under different excavation sequence analysis，which provide reference for reasonable excavation to the developing entry，in order to minimize the impact of roadway excavation on the surrounding rock.The numerical simulation result shows that with different excavation sequence，the stress distribution and safety coefficient of the surrounding rock have obvious difference，and the excavation of interval two routes at the same time have the minimum influence on the surrounding rock.
    Optimizing the Smooth Blasting Hole Spacing with Numerical Simulation Technology
    YU Yang-Ming, QI Jian-Dong, YE Yun, JIANG Zhong-An
    2013, 42(08):  38-41. 
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    Based on the basic rock mechanics properties of Xishimen Iron Ore，the simulation on the coupling charge blasting process of the smooth blasting peripheral holes is made by using the finite element numerical simulation software ANSYS/LS-DYNA.In case of getting the normal rockslides meanwhile minimizing the disturbance of the surrounding rock，a more reasonable spacing of the peripheral holes is determined to be 0.6 m，and the efficiency of smooth blasting is improved as well.
    Further Investigation on Thermodynamics of Gas Based Reduction of Mechanically-activated Iron Oxides
    BU Lin-Chao-Ke, ZHANG Bang-Wen, ZHAO Rui-Chao, ZHANG Yin, XU Jia
    2013, 42(08):  42-46+60. 
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    In view of the fact that the formulas for standard molar Gibbs free energy change of iron oxides reduction which used in our previous research work are not precise, the impact of stored energy on gas-based reduction thermodynamics of iron oxides are further investigated based on new induced formulas. Except for correcting four errors in previous work, it is found out that FeO gas-based reduction itself is not affected by the starting temperature. But in the Fe3O4 reduction gas-based reduction system, FeO reduction owns the same starting temperature as Fe3O4 reduction in transition temperature. the temperature for the transition of the Fe3O4 reduction decreases linearly with the increase of stored energy for Fe3O4, so the reduction of Fe3O4 and FeO occurs at the traditional 570 ℃ below when the stored energy for Fe3O4 is started. Meanwhile, the equilibrium CO (H2) pressure fraction corresponding to the aforementioned transition temperature decreases (increases) with the increase of stored energy for Fe3O4, that is, CO reduction forked curve moves in the direction of low temperature and low CO pressure fraction while H2 reduction forked curve moves in the direction of low temperature and high H2 pressure fraction.
    Beneficiation Tests of Silicon Reduction for Iron Concentrate in Meishan Iron Mine
    HU Yi-Ming, LIU An-Ping, XU Wang-Hua
    2013, 42(08):  47-52+87. 
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    In order to provide technical support for silicon reduction from iron ore concentrate in dressing plant of Meishan Iron Mine，based on identifying reasons for high content of SiO2 in on-site iron ore concentrates，beneficiation tests on the on-site sulfur floating tailings is made by adopting four schemes to obtain iron concentrate with SiO2 content of less than 4%.The results show that option 1 is adding the clean low intensity magnetic separation into the site process and adopts low field into high gradient magnetic separation.Option 3 adopts the process of low intensity magnetic separation-high gradient magnetic separation-fine sieve-regrinding and re-concentration of oversize products.And，option 4 consists of low intensity magnetic separation-high gradient magnetic separation-acidulous positive flotation.All of option1,3 and 4 can realize the iron ore concentrate with SiO2 content <4%.But in option 1，iron ore concentrate is obtained with a relatively high grade iron ore and low iron recovery.In option 3 and 4，iron recovery rate is relatively high and-iron grade is relatively low.So,what kind of option being adopted should be determined through further expanding industrial tests.
    Experiments on Deep Reduction and Magnetic Separation of an Oolitic Hematite from Western Hubei
    LI Guo-Feng, GAO Peng, HAN Yue-Xin, SUN Yong-Sheng, WANG Ze-Hong
    2013, 42(08):  53-56. 
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    Deep reduction and magnetic separation experiments on oolitic hematite for western Hubei province were investigated using coal from Songyuan of Jilin and coke from Ansteel as reductants respectively. Using coke as reductant，the performance indexes of the product，under the optimal process conditions of the reduction temperature for 1 250 ℃，the mole ratio of n(C)/n(O) for 3.5 and reduction time for 160 min and the grinding fineness of -200 mesh 88.92%，were described as follows: metallization rate being 90.50%，iron grade of concentrate reaching up to 96.47% and iron recovery reaching to 87.62%. Using coal as reductant，in the optimal conditions that the reduction temperature and the mole ratio of n(C)/n(O) were not changed and reduction time was 50 min with the grinding fineness of -200 mesh 84.45%，the metallization rate，iron grade of concentrate and iron recovery reached to 91.63%，96.07% and 88.54% respectively. The coal was more suitable to be used as the reductant of carbon-based reduction and magnetic separation process of an oolitic hematite from western Hubei province considering the process indexes，energy consumption and the cost of reductants.
    Depression Effect and Mechanism of Gallic Acid on Calcite
    WU Wei-Guo, ZHU Yang-Ge
    2013, 42(08):  57-60. 
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    In order to provide reference for solving the inhibition problem of calcite in non-sulphide flotation system，the depression effect and mechanism of gallic acid on calcite in sodium oleate flotation system was studied through flotation tests，collector's adsorption measurements and infrared spectroscopic analysis.The results show that calcite is significantly depressed with the addition of gallic acid of 5×10-5 mol/L in pH range of 9~11 and the concentration of sodium oleate of 1.0×10-4 mol/L.The depression effect originates from hydrophilic chelate on the surface of calcite，which is formed by the reaction between the two hydroxyls in gallic acid and Ca2+ on calcite surface.The formed chelate prohibits the adsorption sodium oleate on calcite surface，and generates hydrophilic membrane on calcite surface.
    Beneficiation Experiments of a Bi-Zn-Fe Multi-metal Ore
    TANG Xue-Feng, CHANG Qing-Wei
    2013, 42(08):  61-65+73. 
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    In order to provide a basis for rational development and utilization of a Bi-Zn-Fe polymetallic ore，and in view of the nature of the ore，using SN-9# as selective collector of bismuth minerals，beneficiation experiments is made by the process of bismuth-zinc successive flotation-low intensity magnetic separation.With the addition of combined depressant Na2SO3 + ZnSO4 in coarse concentration，and new environment-friendly efficient inhibitors CK-1# and CK-2# in clean flotation of bismuth and zinc respectively，bismuth concentrate with Bi grade of 17.96% and Bi recovery of 68.08%，zinc concentrate with Zn grade of 48.03% and Zn recovery of 88.61%，and iron concentrate with Fe grade of 66.11% and Fe recovery of 66.15% are obtained separately，which effectively realizes the comprehensive recovery of bismuth，zinc and iron.In addition，silver 823.57 g/t and indium 301 g/t are also enriched from bismuth concentrate and zinc concentrate.
    Beneficiation Tests for a Refractory Kyanite Ore in Jiangsu
    LU Yang, GAO Hui-Min, WANG Fang, HONG Li, GUAN Jun-Fang, ZHANG Ling-Yan
    2013, 42(08):  66-69+91. 
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    Due to low grade，various impurities and complex embedment relationship between kyanite and impurities，a certain kyanite ore in Jiangsu belongs to a refractory ore. In order to provide a basis for the development and utilization of the kyanite resources，the related beneficiation tests were carried out. The results show that: through the process of grinding-iron and titanium removal by high gradient magnetic separation-grading at 45 μm- desliming and settlement for fine particles-acidic flotation for coarse particles，kyanite concentrate 1 with Al2O3 grade of 55.69% and Al2O3 recovery of 69.23% and kyanite concentrate 2 with Al2O3 grade of 50.17% and Al2O3 recovery of 15.16% were gained respectively. Concentrate 1 meets the quality requirements for national industry standards of LJ-55 kyanite concentrate，and concentrate 2 can be used as ceramic raw materials.
    Study on Processing Mineralogy of Yanshan Iron Ore
    HAN Xiu-Li, ZHANG Han, LIU Li-Na, LIU Lei, PAN Miao-Miao, ZHANG Long-Fei
    2013, 42(08):  70-73. 
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    In order to provide a basis for improving the beneficiation indicators of Yanshan Iron Mine，the process mineralogy studies are carried out to identify material composition，structures，occurrence features of major minerals，dissemination size and dissociation performance of iron ore. According to the process mineralogy findings，it is indicated that improving the beneficiation index needs to optimize the ore blending and grinding process for the eastern and western ores in Yanshan Iron Mine.
    Application of High Density Resistivity Method and Radon Survey in the Diggings of Blind Fault Survey
    ZHANG Geng, TUO Xian-Guo, WANG Kai-Yang, LI Bin
    2013, 42(08):  74-76+83. 
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    The high density resistivity method combined with radon survey is used to detect blind fault in the area of the proposed site in the project of No.1 refuse dump and barren rock transportation in Panzhihua Baima Iron Mine.The fault strike and the range of fracture zone is acquired by connecting anomaly belt on multiple lines，and predict the proneness and dip of fault by comprehensively analyzing the anomalous characters of two kinds of geophysical prospecting methods.Through the drilling test，there is an obvious fact that the comprehensive geophysical method with high density resistivity method and radon survey can detect blind fault effectively，and this combination mode also reflects the technical advantage of multi-geophysical prospecting.
    Analysis of Ore-controlling Factors and Features of Zhaojinggou Nb-Ta Polymetallic Deposit
    HUANG Cong-Jun, WANG Dao-Yong, LI Ze-Qin, XI Zhong
    2013, 42(08):  77-79+95. 
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    Through the analysis on the geological feature of Zhaojinggou polymetallic Nb-Ta deposit in Inner Mongolia，it suggests that the acidic rock of Yanshannian is the prospected ore body，which is jointly controlled by stratus，structures and igneous rocks.It belongs to a low-and-medium temperature magmatic hydrothermal vein-type type Nb-Ta polymetallic ore deposit.Albitization and amazonitization are the direct prospecting criteria for Nb-Ta polymetallic deposit in this area.
    Geochemical Characteristics of Trace Elements in Fengcun Lead-zinc Deposits
    LI Xing-Yuan, ZHOU Yong-Zhang, AN Yan-Fei, 吕Wen-Chao , BAI Ming-Liang
    2013, 42(08):  80-83. 
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    According to the survey and analysis of trace elements in Donggangling limestone of Fengcun lead-zinc mine，the results show: Mn content ranges from 208.3×10-6 to 3 191×10-6，with the average Mn content of 1 027.42×10-6;Sr content ranges from 28.69×10-6 to 488.9×10-6，with the average Sr content of 300.45×10-6.w(Sr) /w (Ba)>1，it may be the normal marine sediments.And，w(Sr)/w(Cu) is generally greater than 10，indicating that the sedimentary of limestone is in a closed，dry，anoxic reduction environment.The Pb，Zn contents are significantly higher than the crustal abundance.It is inferred that Donggangling limestone is the main source of the ore.Besides，based on the w（U）/w（Th）>1 in some ore samples，it indicates that Fengcun lead-zinc deposit has the characteristics of sedimentary superimposed hydrothermal reformation type deposit，resulting from the hydrothermal reformation at latter period.
    Geochemical Anomaly Zoning and Prospecting Marks in Longkou Lead-zinc Deposit
    WU 二, CHEN Yuan-Rong, JIANG Hui-Qiao, LU Yue-Ling, 蓝Ni-La , LI Liao-Hui, LIANG Chong-Gao
    2013, 42(08):  84-87. 
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    Through the analysis and summary of the content changes of all the trace elements and hydrocarbon components in different middle part of Longkou lead-zinc deposit，and the enrichment law and abnormal characteristics of the surroundings ore body，it concludes that the zoning sequence of primary halo can be classified as follows: the mine front is Hg，methane，ethane，propane，isobutane，n-butane，ethylene，propylene，the head is As，Sb，the middle is Ag，Cu，Pb，Zn，and the trail is Mo，Co，Ni.The geochemical anomaly zoning model is established and the prospecting guides are summarized to provide the scientific basis for prospecting prediction evaluation in the deep and peripheral area.
    Application of GA-SVR Algorithm to GPS Elevation Fitting
    TAN Xing-Long-1, ZHAO Xiao-Qing, ZHANG Yu-Hua, HU Hong
    2013, 42(08):  88-91. 
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    Due to the complexity of the mining environment and the problems of heavy measurement workload and time-delay existing in the conventional leveling，it is proposed that the support vector regression algorithm calculating is used to calculate the refining quasi-geoid of height anomaly based on the theory of statistics，and GPS height was applied to the mine fast leveling survey.The global search optimal parameter of support vector regression training based on genetic algorithms solved the human blindness in selecting parameters in regression model，and improved the generalization ability of the algorithm and the regression accuracy.Finally，the mine field data was used to compute height anomaly by contrasting with polynomial fitting and radial basis function neural network.The results showed that the support vector regression based on genetic algorithm is simple in structure，and its accuracy is better than that by polynomial fitting and radial basis function neural network.It can be applied into mine GPS elevation fitting.
    Real-time Registration of Mineshaft Images Based on Improved SIFT Algorithm
    XING Yuan-Xiu, JIANG Cheng-Lin, KE Wei-Bing
    2013, 42(08):  92-95. 
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    In view of the fact that the scale invariant feature transform (SIFT) algorithm matching with the mine shaft image does not meet the real-time requirements，an improved SIFT（scale invariant feature transform）algorithm is proposed.In case of keeping the registration accuracy，the algorithm execution time was greatly reduced and the registration accuracy was improved through the reduced scale transformation，simple feature descriptors and considering the Bray Curtis distance as the similarity measure.Experimental results show that the improved SIFT algorithm keeps the linear of the image rotation，the scale and the brightness be changeless，and increases the operating speed at least 4 times higher than that by the original SIFT，resulting in the mineshaft image displaying a good real-time image matching performance.
    Prediction of Surface Miner′s Production Capacity
    CHEN Bao-Xin, HE Cun-Fang
    2013, 42(08):  96-100. 
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    The six empirical formulas are summarized and analyzed using to calculate the surface miner′s production capacity，including the technical production formula，the crushing specific energy formula，Gehring，Dey & Ghose，Bilgin，Copur empirical formula.Seven application instances are applied to verify their accuracy respectively.It shows that the prediction result of technical production formula，Dey & Ghose empirical formula and revised Bilgin formula are more in line with actual production capacity，and their mean relative error in seven application instances are 19.4%，21.6% and 24.5% respectively.
    Research of Production and Ore-matching in Digital Mine based on Dmine
    WANG Yang, ZHAO Ming-Sheng
    2013, 42(08):  101-103. 
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    For the limestone ore with more interlayers and difference grades of ore body，and making use of low-grade ore or waste rock as much as possible，the key is to make the ore matching plan develop carefully.In order to achieve an optimal ore blending，Dmine software is used to build digital models firstly;Then，the production and ore matching are done based on detailed geological exploration data.The results showed that the ore blending not only declined the mine production stripping ratio and improved economic efficiency of enterprises，but also reduced waste emissions and lowered environmental pollution.
    Industrial Tests of Titanium Recovery from Pangang Titanium Tailings with SLon- 4000 Magnetic Separator
    HUANG Hui-Chun, HE Gui-Chun, WANG Hong-Bin, HU Jun
    2013, 42(08):  104-107. 
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    SLon-4000 separator is the largest pulsating high gradient magnetic separator newly developed by SLon Magnetic Separator Co.，Ltd.,with advantages as large throughput，stable performance，easy operation and maintenance，low consumption and small occupation etc..In order to solve the low recovery of coarse titanium concentrate (only about 10%) with spiral chute in titanium recovery from tailings of Pangang dressing plant，industrial tests are made by SLon-4000 magnetic separator instead of the spiral chute.The results indicated that for feeds with the TiO2 grade of 6.20%，coarse titanium concentrate with TiO2 grade of 13.22% and TiO2 recovery of 61.88% was obtained.TiO2 recovery is increased by 50% or more comparing with the spiral chute.Product analysis results show that SLon-4000 magnetic separator realizes the Ti recovery of up to 59.51% at -400 mesh.
    Effect of Saturation Magnetization of Magnetic Matrices on Performance of High Gradient Magnetic Separator
    ZHENG Xia-Yu, LI Mao-Lin, CUI Rui, GUO Na-Na, YAN Ya-Mei, ZHANG Ren-Bing
    2013, 42(08):  108-112. 
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    In order to study the effect of the saturation magnetization of magnetic matrices in high gradient magnetic separator on the magnetism gathering performance so as to provide a theoretical basis for selecting the magnetic dielectric materials for high gradient magnetic separator，ANSYS software is used to simulate the magnetic field distribution of 4 kinds of saturation magnetization with different backgrounds around the magnetic matrices. The results show that: Under the lower background magnetic field than 0.8 T，the four kinds of matrices haven't reach their magnetic saturation，and the magnetic field strength，magnetic field gradient and magnetic force generated by the matrices are substantially the same; When the background magnetic field is higher than 1.1 T，the four kinds of matrices reach the magnetic saturation，the magnetic field strength，magnetic field gradient and magnetic force generated by the matrices with high saturation magnetization is greater than that with low saturation magnetization.
    Research of Formation Mechanism and Treatment of a Landslide at the Downstream of Nu River
    LI Xin-Jie, CHEN Jian-Ping, PAN Yu-Zhen, LI Jia-Qi, MA Yu-Fei, XU Peng
    2013, 42(08):  113-116. 
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    The unique nature of the landslide from the basic characteristics，deformation characteristics and formation mechanism of the landslide are analyzed，and it is considered that the combination of limit equilibrium analysis rigid body and anchor cable anti-slide pile is the best choice of the landslide control in the area of downstream of Nu River.A minimum safety factor of landslide is calculated by GeoStudio.With the safety factor as a starting point，the landslide is kept be in a stable state by the support treatment with anchor cable anti-slide pile.The results show that this method really reaches well effect which provides very good reference value for the landslide evaluation and governing of this region as well as other similar areas.
    Study of Minimum Safe Thickness and Ground Subsidence Deformation of the Stope Roof
    HU Feng, LI Yun-An, LIU Hai-Ao, ZOU Ji-Tao, TAN Dao-Yuan
    2013, 42(08):  117-119+123. 
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    It is mainly discussed that the minimum safe thickness of the stope roof and the ground subsidence deformation during mine excavation.The concrete method is deducing the theoretical calculation formula of minimum thickness of the stope roof according to the bending and shearing structural mechanics model respectively so as to gain the minimum safe thickness; A detailed engineering geological 3d model for mining concessions is built by using Auto CAD，and next a numerical calculation model is established by using ANSYS finite element software，following by importing it to numerical simulation software FLAC3D for calculation.By this method，the whole process of mine excavation can be simulated.Finally，the ground subsidence deformation obtained by simulation satisfies the specification requirements.
    3D Visualization Processing and Analysis of Surface Subsidence Rule of a Mined-out Area
    ZHANG Yao-Ping, YANG Shuang-You, LU Zhi-Gang, SU Xiao-Ping, XIA Yi-Jiang
    2013, 42(08):  120-123. 
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    The leica total station and GPS are jointly ussed for the surface horizontal displacement monitoring of mined-out area，and the triangle elevation method is adopted to make the vertical displacement monitoring，thus obtaining the horizontal displacement value and sinking cumulants of the cavity surface.On this basis，data processing can be realized with the aid of SURFER software to draw the three dimensional surface chart of ground surface settlement，three dimensional section map of the ground surface settlement，post diagram of the surface monitoring point.These drawings reflect the surface changing form，deformation range，settlement size and deformation trends visually.Based on the failure modes of surface movement，the surface horizontal displacement value and the accumulated value of settlement，the specific analysis results and the related recommendations are given.
    The Global Searching Method on Three Points Determining the Arc for Slope Critical Sliding Face
    SONG Ai-Hua, FANG Ding-Wang
    2013, 42(08):  124-126+130. 
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    The circular sliding slope is a kind of usual destroying mode in nature.To analyze on the stability of this kind of slope，it is usual that the center coordinates and its radius of a circular arc are determined as the independent values of safety factors to find out the critical slide face.However，since there are many peak values in rock slope，this method can easily optimize the part of slope，but not the whole one.To avoid this flaw，the research uses the fracture plane and exist side of sliding rock-mass，and the height of the sliding arc to determine the independent values of the critical sliding face.Because the three values have its own meaning of engineering in sliding slope，the variation range of the three values can be adjusted according to the project necessity，the geological characteristics and the slope shapes to easily and directly analyze the slope stability.By this way，the global searching is realized，which solves the problems in optimizing the slide slopes with many peak values.
    Stability Analysis of Jointed Rock Slope after Excavation in Songshunan's Mining Area
    WANG Xin-Gang, HU Bin, LIU Qiang, JIANG Hai-Fei, WANG Wei
    2013, 42(08):  127-130. 
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    The paper introduced the method of obtaining Hoek Brown model parameters and other physical parameters of rock mass by RocDate software according to the rock uniaxial compressive strength，the geological strength index，the rock material parameters，the excavation impact factor，based on the field investigation combining with laboratory tests.Then，the transition and cohesion between the indoor rock mechanics experimental parameters and the field actual rock mass parameters can be realized.By establishing the numerical analysis model，and with the use of geotechnical engineering software FLAC3D，the stability of the jointed rock slope after excavation in southwest section of Songshunan's mining area is analyzed according to the basic parameters of Hoek-Brown-constitutive model acquired.The results show that:①The slope in southwest section is in stable after excavation without large-scale collapse and slippage problem;②Shear stress concentration phenomenon appears on the steps at the bottom of the slope;③small amounts of communicating plastic zone appears in the slope excavation steps，and instability exists in some local slopes.So these zones should be monitored and supported.
    Research of Slope Stability at the Main Stope of Baiyun'ebo Iron Mine
    JI Zhi-Yong, WANG Wei-Ping
    2013, 42(08):  131-133+140. 
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    With the southern slopes above +1 230 m of open stope of the main mine in Baiyun'ebo Iron Mine as engineering background，the limit equilibrium method is adopted to calculate the safety factors under three different combined conditions of the nature，the groundwater and the seismic，and the variation law of stress，strain，displacement is analyzed based on Flac3D.Then，the slope angles of stability for region E1，D1，D2 are finally obtained.
    Application of the Electrical Advanced Detection into Construction of Water-rich Underground Mine
    TAO Lei, CHEN Jian-Hong, HU Jing-Tao
    2013, 42(08):  135-137+140. 
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    In the construction process of water-rich underground mine，the advanced water probing is an important security measure for the mine and the basis for support design.The traditional way commonly adopts drilling，which needs a tedious working process and occupies the tunnel face for a long time so the construction and tunneling speed is greatly influenced.In order to improve the efficiency，various geophysical methods such as TSP，geological radar，infrared detection，high density electric method are compared with each other.According to the actual situation of the mine，the high-density potential method was used for advanced detection and compared with the reality after tunneling.The comparison indicated that the high-density potential method is practical in applications with relatively wide detection range and accurate and reliable detection results.This advanced detection technology is recommended to be promoted in the mine.
    Control of the Underground Main Fan Speed and Air Output with LOGO Time-sharing and Frequency Conversion
    YUAN Mei-Fang
    2013, 42(08):  138-140. 
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    Parts of mine have achieved certain energy-saving effect at the moment by adjusting the frequency and speed of main fan to match the ventilation network.However，it does not regulate speed for energy-saving according to the actual production time of each mine.The control of underground main fan speed and air output is introduced with LOGO time-sharing and frequency conversion，so as to save energy by controlling fan speed matching the underground production time in the pit.
    Influences of the Transition of Open-pit from Underground Mining to the Safety of the Surface Mine Railway
    LI Tong-Peng, BAI Lin
    2013, 42(08):  141-142+146. 
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    In the paper，the subsidence and deformation of the mine railway at the edge of the open pit slope in the transition zones from open pit to underground mining in a certain pyrite mine were calculated and analyzed by using probability integration method and numerical simulation.According to the analysis results，the mining subsequence was optimized，which lowered the influences of the underground mining on the open pit bottom and the upper slope and effectively reduced the displacement of railway embankment.The research provides a theoretical support for the rational exploitation of resources and the protection of surface facilities.
    Statistical Analysis Method for the Effect Evaluation of Mine Dust Control Measures and its Application
    GONG Liang-Wei, TIAN Wei-Dong
    2013, 42(08):  143-146. 
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    Aiming at effect evaluation of dust control measures in mine，two key techniques are introduced: one is the judgment and processing technology of dust sample outlier，which mainly introduces the Grubbs test method to judge and handle the outlier;The other is two independent samples (prior to and after dustproof measures) mean comparison of statistical analysis methods，which mainly introduces the homogeneity test of the sample variance，and t test and approximate t test (t′ test) of the sample mean.Finally，taking the dust catching agent wetting dustproof effect in roadway tunneling working face of II 1024 machine in Huaibei Taoyuan mine for example，the application of the statistical analysis method is illustrated.
    Application of Monte Carlo Method into the Reliability Analysis of Open-pit Mine Slope
    LIU Jia-Dong, LU Hong-Bin, WANG Yu-Bo, XU Zhong-Qiu
    2013, 42(08):  147-149. 
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    Based on the mechanics performance parameters of rock mass obtained from the site geological survey and laboratory tests，Monte Carlo method is used to analyze the 6 sections reliabilities of open-pit mine slopes which is formed during the long-term production to gain failure probability and reliability index for an open pit mine，thus providing reliable reference for slope stability evaluation and the follow-up management of mine slopes.
    Field Mechanical Experiment of Neotype Whole-tailings Cementing Materials
    WEI Wei, GAO Qian, YANG Zhi-Qiang
    2013, 42(08):  150-152. 
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    A neotype cementing material was developed by using industrial residue，and its consolidation of whole-tailings exceeded the cement.Field mechanical experiment was carried out in order to test the reliability and the stability of the neotype cementing material.The effect of different cement-sand ratio and different mass concentration on the 28d compress strength of neotype cementing material and 32.5# cement was investigated.Results show that: the strength of neotype cementing backfilling body is higher than the 32.5# cement backfilling body at the same condition.The solidification effect of whole-tailing using neotype cementing material is better，which provides a new approach for reutilization of mine tailing.
    Pilot Tests on the New Cementing Materials Preparation for Filling in Sijiaying Iron Mine
    LI Mao-Hui, GAO Qian, WANG You-Tuan, YANG Yun-Peng
    2013, 42(08):  153-156. 
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    The new cementing materials stimulating activities of steelworks slag is tentatively exploited，based on the pre-exploratory test，net pulp test and mortar test for Sijiaying Iron Mine.In order to further test and verify the mechanical properties of the new cementing materials，the suitable new filling cementing materials for Sijiaying Iron Mine is obtained from the researches on the new cementing materials in pilot tests with different mortar and concentrations.
    Preparation of Belite-sulphoaluminate Cement with Iron Tailings and its Properties
    ZHENG Yong-Chao, LIU Yan-Jun, LI De-Zhong, LI Qing
    2013, 42(08):  157-160. 
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    With iron tailings and low grade bauxite from Shouyun Mining Company as raw materials，the belite-sulphoaluminate cement clinker was prepared，which proposes a new way for exploring the high added value of iron tailings. The results showed that with the ratio of iron tailings，bauxite，calcined limestone，Al2O3，CaSO4·2H2O of 10∶17∶48∶15∶10 in the raw meal，and at the calcination temperature of 1 350 ℃ for 20 min，belite-sulphoaluminate cement clinker with major components of C4A3S，C2S，C4AF and f-CaO content of less than 1.5% was prepared. Then，natural gypsum and limestone were added into the clinker with the quality ratio of 8% to prepare the cement raw meal. With the cement-sand ratio of 1∶3，and water-cement ratio of 0.6，the cement-mortar product reached the compressive strength of 38.1 MPa，at 3 d，and 52.5 MPa at 28 d.
    Preparation of Unfired Bricks withVanadium Extracted Tailings from Stone Coal
    MA Ying, ZHU Jun, YIN Hong-Feng, LI Lin-Bo, YUAN Hu-Die, LIU Xin-Yun
    2013, 42(08):  161-164. 
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    To seek for an effective proposal on utilization of vanadium extracted tailings from Shaanxi Wuzhou Mining Company，and based on the analysis of physical and chemical properties of the tailings，experimental research on preparation of unfired bricks with the tailings was made. The results showed that parts of the tailings were processed into tailings powder with particle size of -0.088 mm. After that，with the mass fraction of original tailings，tailings powder，cement of 65%，27%，8% as dry solid compound respectively，the mass ratio of water and dry solids of 8%，and under the molding pressure of 15 MPa，the unfired bricks with compressive strength of 30.43 MPa，bulk density of 2.15 g/cm3，porosity of 11% and water absorption of 5% at 28 d were prepared. Its strength meets the requirement of MU25 products on the standard for “JC/T 422-2007 Waste Tailings Non-sintered Bricks”.
    Effect of Particle Size on Permeability of Diatomite Filter Aid in Fields of Medicine and Food
    JIANG Yu-Zhi, ZHANG Zhong-Yang, WANG Li-Hua, YANG Pei-Quan
    2013, 42(08):  165-168. 
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    In order to give a reference for further improving the national standard GB 24265-2009，the baked diatomite filter aid(ZBS) and fluxing baked diatomite filter aid(BS) which were both produced for medicine and food in Linjiang diatomite filter aid factory were used as sample，and the testing device of diatomite filter aid's permeability was used to investigate the influence of particle size on the permeability of the ZBS and BS. The result showed that the equations of the permeability changing with the particle size of the two samples were in accord with the linear equation of direct proportion. But the particle size of ZBS sample had a more apparent effect on the permeability. When the particle size of the two samples was the same，the permeability of the ZBS was higher than the BS'. Through the linear regression equation of the relationship between permeability and granularity，it could be concluded that the d50's range of ZBS for medicine and food should be 24.6~131.4 μm，and the d50's range of BS for medicine and food should be 2.9~79.8 μm.