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Table of Content

    15 May 2013, Volume 42 Issue 05
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    Numerical Simulation on the Coupling Support Scheme of Deep Soft Rock Roadway
    GAO Lin, XU Guo-Qiang, LI Guo-Feng
    2013, 42(05):  1-4+9. 
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    Combined with the special geological conditions and wall rock environment of the deep soft rock roadway，the coupling support scheme with “anchor net + steel strip + anchor cable + shotcrete” and “large deformation anchor with constant-resistance + steel strip + base angle grouting anchor tube” are implemented respectively With the use of the finite difference software FLAC3D，the dynamic numerical simulation on the destruction of deep soft rock roadway after excavation is made to analyze the distribution of the stress and strain and the force status of the support，thus providing the scientific basis for the implementation of supporting scheme in deep soft rock roadway.
    Structural Design of Compound Artificial Boundary Pillar During Transition from Open-pit to Underground Mining
    SUN Lin-Lin, YOU Chun-An, LIU Jian-Xin, SUN Ling-Zhi
    2013, 42(05):  5-9. 
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    Based on the project of Guilaizhuang Gold Mine in Shandong Gold Group，and combining with theoretical analysis and engineering project，an effective construction and mining program of compound artificial boundary pillar with artificial false roof and concrete filling body is proposed，including scope of artificial boundary pillar，structure of artificial boundary pillar，formation of artificial boundary pillar，rebar connection of filling unit，concrete interface treating of filling unit，structure of artificial boundary pillar in narrow ore body area and bottom isolated layer of artificial boundary pillar. Groove breccia slope surface uses metal nets as temporary support，and metal nets are fastened with tubular bolts and rebar belts. Economic benefits from compound artificial boundary pillar and the ore body below compound artificial boundary pillar are studied. The researches show that the compound artificial boundary pillar effectively solves the problem of output stability during transition from open-pit to underground mining in Guilaizhuang gold mine，increases recovery rate of resource and reaches targets of safe and efficient mining，which produces significant economic benefits for Guilaizhuang gold mine.
    Ground Pressure Distribution Features under Filling and Mining of Deep Multiple Mined-out Areas of Gaofeng Mine
    MA Sheng-Hui, WANG Wen-Jie, DENG Jin-Can, WANG Yue-Ling, MA Xiong-Zhong
    2013, 42(05):  10-13+44. 
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    In view of the production safety and efficiency badly threatened by the complex conditions of high stress，local broken ore rocks and multiple mined-out areas in Gaofeng Mine，the numerical model of Gaofeng mine is established with the use of ANSYS-Workbench and imported in FLAC3D to compute and to study the distribution law of ground pressure. The targeted advices of ground pressure control measures are proposed to guide the deep stoping design and mining.
    Experiment on Blasting Damage Combining Ground-penetrating Radar with Ultrasonic
    XU Li-Li, PU Chuan-Jin, XIAO Zheng-Xue, SU You-Wen
    2013, 42(05):  14-17+30. 
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    The blasting damage tests with different charge structure of the concrete model is made by combining ground-penetrating radar with ultrasonic. The results show that it is feasible to use the ground-penetrating radar for damage location of concrete blast，and the quantitative evaluation of blasting damage can also be obtained together with ultrasound technology. Concrete blast damage mainly appears in the initial location of the damage (defects)，and is the result of the initial damage “growing up”. The damage area in ground-penetrating radar cross-sectional view show good correlation with the reduction of the acoustic wave speed before and after blasting.
    Research on the Activity Law and Support Technique of Stope Ground Pressure in Xincheng Gold Mine
    LIU Jie, XU Zeng-He, ZHAO Xing-Dong, DENG Wen-Xue
    2013, 42(05):  18-21+44. 
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    Taking the upward sublevel filling method used in difficultly mining ore body of Xincheng Gold Mine as engineering background，the numerical simulation software FLAC3D is adopted to analyze the change law of the stress and displacement in the process of the first step and second step stoping. The underground pressure activity law can be forecasted quantificationally during the mining period. At the same time，arming at the problem of the mismatching between stope ground pressure and anchor bolt support mechanism，the combined support scheme of long anchor cable and resin bolt and support parameters are determined and the support effect is evaluated. The research result provides the reliable theory for the ground pressure control of similar mine.
    Three-Dimensional Transversely Isotropic Numerical Analysis of Stratified Rock Slope
    SHI Wen-Hao, YANG Tian-Hong, WANG Pei-Tao, YU Qing-Lei
    2013, 42(05):  22-26+30. 
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    A three-dimensional continuum mechanics model for layered rock mass was established，and the 3D Hoffman strength criterion was introduced into stratified rock slope stability analysis. The 3D slope failure modes in different angles were simulated. The results show that when the discontinuities are horizontally distributed，shear stress acts as the leading role and leads to shear failure. When the discontinuities are vertically distributed，principal stress plays the leading role and leads to tilting failure because of the tensile stress. The failure mode acts from shear failure caused mainly by shear stress to tensile-shear stress caused by tensile-shear stress，and then to tensile failure caused mainly by tensile stress，when the strike of the strata is the same as the strike of the slope，and strata angle changes from 0° to 90°. In addition，shear and slip failure will occur more easily of the dip layered rock masses，but it will occur more hardly of the anti-dip layered rock slope that may have some small range damage but is overall stability. These research results can provide references for transverse isotropic slope design，support and monitoring.
    Numerical Simulation Research on Pillar Stope Stability Under High Stress Conditions in Big Panel
    GUO Wei, ZHANG Chuan-Xin, ZHAO Ji-Yin
    2013, 42(05):  27-30. 
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    Based on the geological survey and samplings above the Datuanshan middle -580 m，and in order to make full use of the current mining preparation system，it is planning to make the stoping scheme based on the stoping width by means of FLAC3D Numerical simulation without the gob backfilling. Then，the stability analysis is made for parts of or all stopes at the lower panel under high stress conditions. Through research on the internal stress and displacement rule of the pillar，and combining with the early rock mechanics theory，the optimum scheme is got to ensure the smooth mining.
    Application of Non-pillar Sublevel Caving Method in Chambishi Copper Mine
    QI Xiao-Lei, SU Yong-Ding
    2013, 42(05):  31-33. 
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    Based on many years of mining experience in Zambia Chambishi Copper mine，the design elements，technical measures and the problems encountered in the exploration process of inclined and medium-thick ore-body with the application of non-pillar sublevel caving method are summarized so as to provide a reference for the similar ores.
    Study on Support and Construction Technology of Three-dimensional Oblique Intersection with Large Section
    XIAO Yu, HAN Li-Jun, ZHANG Yang, MEI Feng-Qing
    2013, 42(05):  34-36+40. 
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    In order to solve the problem of poor supporting effect of the three-dimensional Oblique intersection，which was caused by large cross section，big excavation disturbance and construction difficulty，an active and passive combined rigid-flexible combination support was proposed. Pre-reinforcement to above haul lane was adopted with bolt-mesh-anchor support system firstly，then the Steel support was applied for the cross-section of the two roadways. Finally，the cover-excavation method is used to the construction of intersection roadway. The practice results show that the application of this support and construction technology achieved a better effect of supporting. It plays the role in ensuring the security，lowering the construction difficulty，minimizing the transport time hindered.
    Discussion on Haulageway Transition by Stages Boundary in Nanfen Open Pit Iron Mine
    FAN Li-Jun, ZENG Peng-Yi, SUN Dian-Xing
    2013, 42(05):  37-40. 
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    During the transition of the mining by stages and by divisions in Nanfen open-pit iron mine，aiming at the problems of the slope rolling stone's constraints and haulageway transition，it's very necessary to adjust the elevation and height of cutting the rolling stones platform.The platform of the wall pushback transition is designed to the transitional haulagway，which is verified by the method of making up the digging schedule plan in order to achieve the goal of safety production and smooth and steady wall pushback transition in Nanfen open-pit iron mine.Meanwhile，the short distance highway transportation is formed with the consumption of trucks fuel lowered，the additional operating costs reduced and the economic benefits of the mine enhanced.
    The Effect of Bottom Water Media of Blast-hole on Bench Blasting
    CHEN Lei, WU Lei, LI Yin-Xia, CHANG Jian-Ping
    2013, 42(05):  41-44. 
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    A comparative numerical simulation analysis was conducted via the software ANSYS/LS-DYNA on the charge structure between gun hole at the bottom of the water space and the normal blasting structure. The results showed that the water cushion at the bottom of the step blast holes makes explosive energy in blast holes a more even distribution，which lengthens the action of the stress wave in rock mass，and benefits to break the bench rocks. The specific application of the research finding above makes a good blasting effect and thus brings a reference for further study of the water pressure blasting theory and field applications.
    Numerical Simulation of Damping Effects of Damping Ditch Parameters on Vibration Reduction
    PAN Tao, KANG Qiang, ZHAO Ming-Sheng
    2013, 42(05):  45-48. 
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    By using the numerical simulation method，groups of simulation experiments with different parameter values have been carried out especially for four parameters including the distance，length，depth and width from ditch to blast hole. The simulation data reflects the influence of different parameters on damping effect of damp ditch. The simulation results indicated that: except for the width，the distance，length and depth from ditch to hole of damp ditch have significantly influence on the damping effect. The achievement is useful for proper use of damp ditch in engineering.
    Stability Analysis of Open Pit Mining Slope Based on the Shear Strength Reduction Method
    LIU Qiang, HU Bin, JIANG Hai-Fei, WANG Xin-Gang, GUO Li-Na
    2013, 42(05):  49-52. 
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    According to the geological survey information of Songshunangou diggings in Qinghai province，the computation model of slope in southwest was built. The safety factor was solved by shear strength reduction method.The result under different reduction coefficient was obtained by using the FLAC3D. And the criterion with main plastic zone analysis and assisting by maximum horizontal displacement is determined to achieve the safety factor quickly. After analyzing the computation result，it concludes that the safety factor of southwestern slope is 1.85 under natural state. Through comparative analysis，the fault in southwest slope has a great influence on stability of mine slope，which must be majorly monitored during the mine excavation.
    Study on Influence of the Mining Sequence on Tunnel Deformation in Deep Mine
    LIU Wei, YANG Rui-Xia, ZHANG Rui-Chong
    2013, 42(05):  53-55. 
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    The numerical simulation on the actual mining sequence of ore-body is made by FLAC3D program to analyze the regional variation of the surrounding rock stress，deformation and plasticity caused by the mining at the upper stage，thus obtaining its regional variation rule.The paper provides a theoretical basis for the roadway stability control.
    Determination of Slope Structural Parameters of the Multi-step Overlay Dump
    MAO Quan-Sheng, LE Tao
    2013, 42(05):  56-58. 
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    With the steep topography and large height difference，Baima Iron Mine's dump belongs to the multi-step overlay dump. In order to ensure the stability of dump slope，the residual thrust method within the limit equilibrium analysis method is adopted to calculate the stability of the bench slope and the overall slope under different bench's heights and different platforms' width. With the least squares method is used to determine the step height (40 m) and platform width (50 m) that is allowed by the safety factor.
    The Optimal Choice on the Underground Mining Method of E'Kou Iron Mine
    SUN Li-Jun, ZHANG Cheng-Xiao, DAI Bi-Bo
    2013, 42(05):  59-61+120. 
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    In order to select the optimal underground mining method for E'kou Iron Mine，through analyzing the occurrence condition of out of the boundary iron minerals，the alternative scheme suiting for ore mining is recommended. On the basis of comparing the technical economic，advantages and disadvantages of the alternative，the gray math model is built and the optimal alternative program is selected by using the grey situation decision，finally choosing the pillarless caving method as the best program for the E'Kou Iron Underground Mining. Meanwhile the accessory equipment for the pillarless caving method is recommended. It supplies the scientific basis and convenience under the grey situation decision used in optimizing the mining method.
    Quantitative Research of Synergistic Effects of Combined Flotation Reagents
    WANG Ji-Zhen, YIN Wan-Zhong, LIU Ming-Bao, WANG Yu-Lian, ZHONG Wen-Xing
    2013, 42(05):  62-66. 
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    The synergistic effects of combined reagents have been investigated using the application of the flotation reagents theory and the physicochemical properties of surfactants. Taking some combined reagents such as oleic acid and carboxylic acid with different carbon chain length,sodium oleate and carboxylic acid with different saturation，emulsifier and sodium oleate，sulfonate and sodium oleate，carboxylic acid and benzohydroxamic acid，for example，through the calculation of agent structure parameters and interaction of hydrophobic chain/hydrophobic chain，and compared with literature data，it is found that the combined reagent with large difference in agent structure parameter，surface tension descending significantly，strong interaction of hydrophobic chain/hydrophobic chain，and strong selectivity and collecting ability performs better in flotation. This paper has theoretical refevences significance on quantitative research of combined reagents synergistic effects.
    Decreasing the Content of MgO in Jinchuan Copper-nickel Concentrate by Citric Acid and (NaPO3)6
    ZHANG Ya-Hui, XIONG Xue-Guang, ZHANG Jia, LONG Gang
    2013, 42(05):  67-70+74. 
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    Using citric acid as complex agent，sodium hexametaphosphate as inhibitor，the flotation tests on quality increase and magnesium decrease for No.2 Mine Area of Jinchuan Nickel Mine are made and compared with the laboratory closed-circuit tests under on-site reagent system. The tests indicate that for the raw ores containing nickel of 1.36%，copper of 0.86%，MgO of 28.19%，the final nickel-copper mixed concentrate with Ni grade of 9.68%，Cu grade of 5.04%，MgO content of 6.33%，nickel recovery of 84.32% and copper recovery of 69.13% are obtained by the closed-circuit process of one roughing-two cleanings-three scavengings-middles back to the flow-sheet in turn. Each index in the tests above is better than that in the laboratory closed-circuit tests under the system of on-site pharmacy.
    Study on Increasing the Grinding Efficiency of the Oolitic Hematite from Western Hubei Province with Sodium Hexametaphosphate
    WANG Ze-Hong, XU Chang, LI Guo-Feng
    2013, 42(05):  71-74. 
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    The paper described the improved grinding efficiency of the oolitic hematite from western Hubei Province in the presence of sodium hexametaphosphate（SHMP）,and mechanism of SHMP used as grinding aids was analyzed by measuring the viscosity and pH value of the grinding pulp，the surface potential and morphology of particles after grinding. The results presented that the contents of -0.074 mm in the grinding products was increased by 30.25% by keeping other grinding parameters as constant and with the addition of 0.8% (mass ratio of the sample) of SHMP. By lessening the viscosity of pulp，raising pH value，changing the surface potential of the particles，reducing the amounts of fine ore grains sticking to granules and acting on the micro cracks on the ore grain surface，SHMP could work by all of these patterns to promote the crushing environment and then increase the grinding efficiency.
    Experiments on Reverse Flotation of Concentrate of Low Intensity Magnetic Separation for Iron Increasing and Silicon Reducing of an Ultra-low-grade Magnetite in Fujian
    LIAO Xiang, LIU Yan-Jie, XU Rui, YANG Chong, QIN Lei, LI Bao-An
    2013, 42(05):  75-77. 
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    After the ultra-low-grade magnetite of micro-fine-grained disseminated in Fujian province was separated by low intensity magnetic separation. Fe grade of the concentrate was 65.30%，while the silica content was up to 8.52%,which is the major factor affecting the concentrate quality. For the concentrate of low intensity magnetic separation，technical conditions of reverse flotation for iron increasing and silicon reducing was explored. The results indicated that through the closed-circuit reverse flotation of one roughing，one cleaning and three scavengings and middles back to the flow-sheet in turn，iron concentrate with Fe grade of 68.97%，recovery of 98.25% and silica content of 3.35% was obtained，while tailings with Fe grade of just 16.39% and recovery rate of 1.75% was gained as well. A remarkable effect of iron increasing and silicon reducing is obtained in the experiment.
    Flotation Experimental Research on a Low-grade Pyritic Gold in Xinjiang
    YU Shi-Lei, WANG Yu-Hua, WANG Jin-Ming, ZHANG Ying, YU Sheng-Li
    2013, 42(05):  78-81+91. 
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    Due to serious alteration of gangue mineral in a low-grade pyritic gold in Xinjiang province，and the high content of gangue slime has strong impacts on the flotability of gold-carrier mineral. This problem could be properly solved by adopting methods as strengthening the dispersion of the slime and inhibition on gangue，and reinforcing the activation and collection on gold-carrier mineral. By using sodium carbonate and soluble glass as the combined modifier，copper sulfate as activator，isoamyl-xanthate and dithiophosphate BA as the combined collector，the RB-3 as frother，a closed-circuit flotation flowsheet consisting of two roughings，two concentratings and three scavengings has been performed. The original grades of gold and silver are 1.49 g/t and 6.11 g/t separately for the run-of-mine ore，the grade and recovery of gold in the concentrate of closed-circuit test have attained 20.07 g/t and 67.49%，while the grade and recovery of silver have reached 42.45 g/t and 34.81%.
    Optimization of Beneficiation of a Refractory Cu-Pb-Zn Polymetallic Ore in Inner Mongolia
    ZHOU Tao, SHI Wei-Hong, YU Jiang-Hong
    2013, 42(05):  82-87+91. 
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    The nature of a copper-lead-zinc polymetallic sulfide ore in Inner Mongolia is complex，and it is difficult to achieve the effective separation of copper，lead and zinc. Some factors that affecting the separation of copper，lead and zinc are studied. The results show that the combination of T-16 and zinc sulfate is a efficient pulp regulator to highly effective realize the separation of copper，lead and zinc，which owns the role of inhibiting zinc，activating copper and eliminating the sticky pulp foam. The pre-dewatering and thickening of the mixed copper and lead concentrate build the foundation for the next reagent removal with activated carbon，which is the precondition to achieve the efficient separation of copper and lead. Then，the optimized process is applied to the laboratory closed-circuit tests and field production separately,obtain the desired expectation on effective separation of copper，lead and zinc，and significantly the quality of copper concentrate improve and lead concentrate. In on-site production，the Cu grade of copper concentrate is increased from 23.15 % to 28.18%，and its recovery increased from 64.53% to 79.51%. Pb grade of lead concentrate is increased from 44.59% to 57.07%，and its the recovery increased from 59.61% to 89.68%.
    Nelson Beneficiation Tests of a Gold Ore in Shanxi
    GOU Ming-Liang, WU Jun-Jie, CUI Chang-Zheng
    2013, 42(05):  88-91. 
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    A gold ore in Shaanxi is complex in composition，and gold is naked and semi-naked with main inter-granular distribution. The coarse-grained gold is 95.68% of the total gold. Due to its flake or wheat grains granular，it is easy to be deliberated. Under the grinding fineness of the contents of -0.074 mm is 65%，79.37% of the gold with the grain of 78 to 300 mesh was enriched. The Nelson beneficiation test results show that under conditions of the ore grinding fineness of -0.074 mm 65%，feeding concentration of 30%，feeding speed of 6 kg/h，fluid water speed of 2.0 L/min and gravity expansion for 60 times，gold concentrate with Au grade of 233.33 g/t and recovery of 87.38% were obtained.
    Beneficiation Tests of a Refractory Copper Oxide Ore in Sichuan
    SHI Gui-Ming, YU Xia-Jing, WU Cai-Bin
    2013, 42(05):  92-94. 
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    The mineral composition and structure of a refractory oxide copper in Sichuan is complex while the total copper of 93.79% are free copper oxide and combined copper oxide. These copper oxide exists in the form of malachite and azurite with fine dissemination and mainly distributes in the non-metallic mineral fractures. The technical conditioning tests for this ore indicated that the combination of DZ-602 and Na2S can effectively activate the oxidized copper minerals and increase its hydrophobic property. By adopting the process of two roughings,two cleanings,and two scavenings and middles back to the flowsheet in turn，copper concentrate with copper grade of 20.12% and copper recovery of 75.35% was obtained.
    Beneficiation Tests of a Xiaochangba Lead-zinc Mine in Gansu
    LIU Shou-Xin, YU Jiang-Hong, ZHOU Tao, SHI Wei-Hong
    2013, 42(05):  95-98. 
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    Xiaochangba lead-zinc ore in Gansu belongs to the primary sulfide lead-zinc ore. As the main lead mineral，galena is closely disseminated with sphalerite,difficult to libevate，and unsatisfactory recovery of micro-fine particles are the main factor resulting in low recovery of lead. Taking D102 as collector for lead floating，and adopting the process of the preferential lead flotation with one roughing-two scavengings-three cleanings，and zinc floatation with one roughing-two scavengings-three cleanings，lead concentrate with Pb grade of 59.72% and recovery of 73.52%，and Zn content of 14.56%,and zinc concentrate with Zn grade of 52.97% and the recovery rate of 92.12% and Pb content of 1.60% were gained separately. With zinc recovery slightly increased,the percentage of lead recovery is improved 2.04%.
    Flotation Processing Research of a Low-Grade Manganese Carbonate Ore
    CAO Xue-Feng, LU Jian-An, ZHANG Gang
    2013, 42(05):  99-101+116. 
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    The main chemical composition analysis and Mn-phase analysis on a low-grade manganese carbonate ore were made. With oleic acid as collector，SDBS as synergist， sodium silicate as depressor of quartz and silicate minerals，and sodium carbonate as the regulator of Pulp pH value，the conditioning tests for flotation process are carried out. The results indicate that under the grinding fineness of the content of -0.074 mm is 90%，final manganese concentrate with Mn grade of 17.10% and Mn recovery of 87.65% was achieved by the closed-circuit process of one roughing-two cleanings-one scavenging and middles back to the flow-sheet in turn.
    Beneficiation Tests on a High-sulfur Bauxite of Chongqing
    CHEN Da, YAN Wu, XIONG Shu-Qing, YANG Lei
    2013, 42(05):  102-104. 
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    In a Chongqing high sulfur bauxite，the main aluminum-containing mineral is diaspore，sulfur-containing mineral is pyrite and the ratio of Al-Si is only 4.73%. The technical conditioning tests on sulfur removal，silicon decrease and aluminum increase were made. The results show that bauxite concentrate with Al2O3 grade of 65.81%，S giade of 0.42%，Al-Si ratio of 9.09，and Al2O3 recovery of 77.88% was ultimately obtained by the flow-sheet processes of one roughing floatation for sulfur concentration，two roughings,three cleanings and one scavenging and middles back to the flow-sheet in turn. The byproduct sulfur concentrate with S grade of 22.13%，S recovery of 82.69%，Al2O3content of 32.94% and the recovery rate of 5.15% was achieved.
    Research Progress and Development Trends of Informatization for Traditional Mineral Resource Estimation
    CHEN Guo-Xu
    2013, 42(05):  105-109+143. 
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    Combining with the development history of mineral resources estimation in China，the advantages and disadvantages of the traditional mineral resources estimation methods were introduced in brief. Based on this，the research process and the development trends of informatization modification for the traditional mineral resource estimation in china are deeply discussed. Then，the developing direction of the traditional mineral resource estimation at post IT era in China is analyzed and discussed.
    Delineation of Assemblage Element Anomaly and Prospecting Direction in Dawan Gold Deposit
    YANG Hai, PENG Xiu-Hong
    2013, 42(05):  110-112. 
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    The geochemical character in Yunnan Dawan Gold Deposit shows that Au has positive correlation with As，Sb，Hg，but higher correlation with As and lower correlation with Hg，and negative correlation with Cu，Co，Ni. R-type factor analysis method and superposed element anomaly method are used for anomaly delineating. Comparing with each other，R-type factor analysis method could find the concentration center of assemblage anomaly correctly and directly，but the ranges of anomalies are large，resulting in difficulty to judge the concentration center clearly. However，the anomaly ranges delineated through threshold is real.
    Enhancing Interpretation of Linear Geological Structure Based on Directional Illumination
    XI Yan-Tao, WU Jing, RUI Xiao-Ping, GUO Wei-Peng, GUO Gao-Xuan, LIU Kai
    2013, 42(05):  113-116. 
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    Taking the Fangshan Zhangfang area in Beijing as an example，the paper simulated the illumination models in all direction to enhance linear characteristics of muti-spectral image，and choose the best illumination models to enhance linear characteristics of regional structure. By this method，the interpretability of the linear geological structure is effectively improved to obtain the remote sensing interpretation of the fault structure. The research provides the reference for studying the mechanism of karst.
    Research on the Key Technical Scheme on Transportation for Unmanned Underground Mine Electrical Locomotive
    ZHANG Yi-Li, WANG Ling-Hui, HUANG Shou-Yuan
    2013, 42(05):  117-120. 
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    Taking Dongguashan Copper Mine as a mine case，the key issues on the unmanned mine electrical locomotive were analyzed，and the related technical solutions were presented including intelligent motor vehicle technical program，ICT program，scheduling system solutions as well as the technical program for loading station control. The trials on the application of the underground mine unmanned electrical locomotive into the middle section of -875 m Dongguashan copper mine is greatly successful，which verifies that this technical scheme is practical and feasible with good initial effects.
    Numerical Simulation of Sensitization Device of Underground On-site Mixed Loading Emulsion Explosive Truck
    SUN Wei-Bo, WANG Yan, REN Feng-Yu, GUO Zhi-Da
    2013, 42(05):  121-124. 
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    According to one of the performance parameters of underground emulsion matrix and sensitizer of metal underground mines，the fluent software is used to make numerical simulation on the mixed and sensitized effect of underground site emulsion explosive through the impinging stream mixing unit. The mixing effect under different structure parameters of the V type impinging stream mixer is simulated through orthogonal tests. The simulation results show that the V type impinging stream unit with 4 entrances，5 mm of diameter，90° entrance angle and 10 mm outlet diameter is the best. It can achieve the requirements of short distance continuous static mixing sensitization for underground site mixed emulsion explosives.
    Management System of Accurate Ore Costing for Gold Mines
    XU Bo, HUANG Wu-Sheng
    2013, 42(05):  125-127. 
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    For the core purpose of “clear cost，real-time tracking，optimal control”，and based on a comprehensive and systematic summary of the gold mine cost，the management system of accurate ore costing for gold ores is built. Such issues as actual-time dynamism in terms of time and refinement on cost calculation units in terms of space etc. of Gold Mine are solved，which help mining enterprises to master costs consumption，to accurately analyze cost difference and to optimize and adjust cost management measures. The management system，key models and treatment solutions proposed can be commonly used in metal underground mines，which can serve as a reference for other similar mines.
    Study on the Mathematical Modeling and Mechanism of Optimal Path of Underground Hedge
    WANG Jin-Hua, ZHANG Ya-Jing, ZHU Ling-Qi, LI Yu-Ping
    2013, 42(05):  128-130+152. 
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    The hedge route is the life line of the underground personnel，and is also the first step to implement effective hedge. In this paper，the impact mechanism of underground hedge is analyzed，and the prevailing quantitative indicators are established from the roadway safety and hedge efficiency. The algorithmic model of underground hedge's optimal path by introducing the equivalent weight factors of hedging efficiency based on the improved Dijkstra algorithm. It also conducts simulation by the tunnel network diagrams of underground pre-disaster and post-disaster. The experimental results show that the algorithm of optimal hedging path is more effective than the improved Dijkstra algorithm to solve path. It provides mathematical model and quantitative analysis for the selection of optimal path and the optimization design of hedge route.
    Response of Purple Alfalfa for Vermiculite as Material Substitute Modifying the Surface Soil of an Open-pit Mine
    WEI Bei-Lei, CHEN Yu-Jiu, HU Zhen-Qi, LIN 杉, YANG Jie, LI Yao
    2013, 42(05):  131-134+152. 
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    Choosing appropriate modifier as substitute of surface soil for scientific and reasonable improvement is the key for reclamation of overburden dumps in topsoil deficient area and adverse circumstances. Growth performance and stress resistance of crop is the response of the modifying effect. This experiment aims to research the effect of vermiculite to the growth performance and stress resistance of alfalfa and then evaluates its modifying effect on the cinnamon soil in mining area. In the experiment，single-factor with completed random is adopted. Local normal surface soil is used as control group and cinnamon soil as modified object. There are four parallel tests-0，10，30，50 g/kg vermiculite according to the added content of dry soil and each parallel test has three repeated experiment. The results showed that the vermiculite has obvious influence on the indexes of leaf area，plant height，root length，biomass，SOD activity，CAT activity，cell membrane permeability and so on（P＜0.05）at alfalfa seedling stage. But it has no obvious influence on content of chlorophyll and POD activity（P＞0.05）of alfalfa. It turns out that the growth performance and stress resistance of alfalfa do not have linear relation with added content of vermiculite. When the addition of vermiculite is 50 g/kg，it has the best improving effect on growth performance and stress resistance of alfalfa，and the best improvement for cinnamon soil.
    Eco-environment Status and its Comprehensive Countermeasures of Longnan Ionic Rare-earth Mine
    LIU Fang
    2013, 42(05):  135-138. 
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    Taking ionic rare earth mine in Longnan of Ganzhou as an example，the paper introduces the historical mining technologies and their main features in destroying the eco-environment，summarized the current eco-environment status and the problems existed. Then the basic ideas and the main measures for the comprehensive improvement of the eco-environment are proposed，including clarifying the main responsibility of land reclamation，finding out the local situation of abandoned mine land. Mine eco-environment can be restored by land surface stabilization，land consolidation and vegetation construction projects，etc. which could provide references for the future eco-environment remediation of ion-absorbed rare earth mine in Ganzhou.
    Research on Water Environment Problem Induced by Coal Mining of Jining City
    LI 恩Lai, LI Jing, YU Yang, ZENG Ji-Yong, MIAO Hui-Ling, LIU Kun-Kun
    2013, 42(05):  139-143. 
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    Based on the investigation of present situation of coal mining and water resource in Jining，the paper discusses the coal mining impacts on the content and quality of surface water and underground water，and describes the serious impact on water resources based on the water data of Jining. The related strategies to release the impact is proposed，hoping to provide a favorable information for governance and protection of the water environment in mining areas.
    Micro-seismic Activity Law Near the Synclinal Axis and its Impact
    XIE Qun, DOU Lin-Ming, LI Ning, ZHANG Jun-Wei, XIE Long, XIE Lian-Yin
    2013, 42(05):  144-147+163. 
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    According to the data of Poland SOS microseismic monitoring system，the seismic source evolution law near the synclinal axis is analyzed combining with the actual conditions of 250204 working face in Yanbei. The conclusions are as follows: during the period of mining，and when the working face is in the synclinal axis，the seismic source are mainly distributed above the coal seam，that is，the microseismic activity mainly occurs near the roof. When the working face is moving away from the synclinal axis gradually，seismic source distributions have a tendency to the lower side of coal seam，which means that the micro-seismic activity occurs mainly near the floor. When the two factors of syncline axis and the working face square overlay，rock burst tendency increases significantly. At last，the energy-frequency law of rock burst for synclinal axis tectonic is summarized which plays an important role in the production practice.
    Research and Practice on Floor Fault Water Control in Huaibei Mining Area
    PAN Rui, MENG Xiang-Rui, GAO Zhao-Ning
    2013, 42(05):  148-152. 
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    To get effective management of water-inrush from backplane fault in Huaibei mining area，different measures are taken for different fault situations. Fault dip and coal permeability influenced by fault were fully considered on coal pillar design and hydraulic connection between the aquifers also considered on grouting and water drainage. Research and practice showed that the coal pillar preserve is more scientific and reasonable after considering the fault dip and coal permeability influenced by fault，compared with the traditional coal pillar design. The fault dip of 60° at Fault F2 of Taoyuan Mine is the critical angle. For security，backplane monitoring should be strengthened after preserving the coal pillar to prevent from and treat water inrush caused by fault. The drainage tests before grouting can better understand the hydraulic connection between the aquifers and play a guiding role in grouting. Engineering practice in Zhuzhuang mine and Yangzhuang mine also shows that grouting has a remarkable effect on preventing water-inrush caused by some minor faults.
    Research on the Fluidity of Backfilling Material with Preparation of Steel Slag Gel System
    ZHANG Jing-Wen, NI Wen, HU Wen, HUANG Xiao-Yan
    2013, 42(05):  153-156+168. 
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    Abstract The main factors for affecting the fluidity of filling material are analyzed under the slag cementitious system without clinker，The fluidity tests results show that the addition of fly ash can significantly improve the liquidity of the system. The slurry fluidity increases with the increase of fly ash content within a certain range. With the fly ash content of 15%，the slurry fluidity reaches maximum 220 mm; The slag has less improvement on the slurry liquidity effect than fly ash，but can improve the compressive strength of the filling body at each age; The tailings at appropriate grade have positive effect on liquidity with the increase of maximum 46.7%; The slurry concentration has a great impact on the liquidity and strength of the system. The slurry with concentration of 73% has a good workability and its fluidity is up to 240 mm maximum.
    Experiments on Ceramsite's Plasticization with Sandstone Coal Gangue in Chaoyang
    SUN Xiao-Gang, LI Xiao-Qing, WANG Yan-Bing, XING Jun, QIU Jing-Ping
    2013, 42(05):  157-159. 
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    Using the sandstone coal gangue from Chaoyang area of Liaoning province as main raw material to prepare ceramsite，together with oil shale and shale which is easy to get in this district as main mixing material，the Ceramsite's plasticization is studied. The result showed that the plasticity index，the granulation rate of the unbaked ceramsite increase with improving the fineness of the sandstone coal gangue，furthermore the cylindrical compress strength of the baked ceramsite correspondingly increased; The plasticity index of the unbaked ceramsite and the cylindrical compress strength of the baked ceramsite have small extent of improvement by mixing with oil shale，but there was no significant effect on the granulation rate of the unbaked ceramsite. Mixing with shale could obviously improve the plasticity index and the granulation rate of the unbaked ceramsite and the cylindrical compress strength of the baked ceramsite. When the mass ratio of the sandstone coal gangue and shale is 6∶4，the cylindrical compress strength of the baked ceramsite could be up to 8.4 MPa.
    Effects of Proportion of Gypsum and C/S Ratio of the System on Autoclaved Aerated Concrete
    CHEN Wei, NI Wen, LI Qian, HUANG Xiao-Yan, ZHU Li-Ping, LI De-Zhong
    2013, 42(05):  160-163. 
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    With the gold tailings of Shandong Zhaoyuan Gold Mine as the main raw materials，the effects of proportion of gypsum and C/S ratio of the system on the strength and bulk density of the autoclaved aerated concrete are investigated. And the products are characterized by XRD and SEM. The results show that gypsum can adjust the setting time of the aerated concrete，improve the early strength of the bodyware，but no significant impact on the dry strength of the products. The appropriate mixing amount of gypsum is 3% of the total mass of the tailings，cement，lime and gypsum. Tobermorite's crystals and dosage determines the strength of aerated concrete products，but is affected by the calcium-silicon ratio of the raw materials. The appropriate calcium-silicon ratio in testing is 0.7.
    Reactive Activity of Iron Tailings Powder and its Enhancement Effect upon Concrete
    CHEN Meng-Yi, LI Bei-Xing, WANG Wei, ZHU Zhi-Gang
    2013, 42(05):  164-168. 
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    The activity of the silicon-rich iron tailings powder under different curing conditions and its enhancement effect in concrete are characterized by introducing the concept of activity indicators，the strength contribution value and the strength contribution rate etc.. The results show that mechanical grinding can hardly change the activity of powder of iron tailings while curing conditions go to the opposite. Moreover，the powder of iron tailings does not own the pozzolanic activity under standard curing，90 ℃ hot water curing and 200 ℃ high-temperature curing，and its enhancement effect on concrete mainly belongs to micro-aggregate filling effect. Under autoclave curing conditions，powder of iron tailings have a obvious reactivity，and greatly inhance the strengthen of the concrete. With the specific surface area of 751 m2/kg，and the mixing amount of 20%,powder of iron tailings own the strength contribution rate of 23.5%，27.3%，30.9% at 3 d，28 d,56 d respectively. According to the different curing conditions，the specific surface area is appropriate to be 500 ~ 750 m2/kg and the amount of substitute of cement will be 20%.