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金属矿山 ›› 2020, Vol. 49 ›› Issue (11): 25-30.

• 采矿工程 • 上一篇    下一篇

泵送剂掺量对充填料浆流动性能及充填体力学性能的影响

薛振林,张友志,甘德清,张欣,胡胜   

  1. 1. 华北理工大学矿业工程学院,河北 唐山 063210;2. 华北理工大学学科建设处,河北 唐山 063210;3. 北京科技大学土木与资源工程学院,北京 100083
  • 出版日期:2020-11-15 发布日期:2020-12-22
  • 基金资助:
    国家自然科学基金项目(编号:51774137);河北省自然科学基金项目(编号:E2019209326);唐山市科技计划项目(编号: 20130207b)

Effect of Pumping Agent on Fluidity of Filling Slurry and Mechanical Properties of Filling Body

XUE Zhenlin,ZHANG Youzhi,GAN Deqing,ZHANG Xin,HU Sheng   

  1. 1. College of Mining Engineering, North China University of Science and Technology,Tangshan 063210,China; 2. Department of Discipline Construction, North China University of Science and Technology, Tangshan 063210,China; 3. School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083,China
  • Online:2020-11-15 Published:2020-12-22

摘要: 泵送剂作为改善充填料浆流动性能的添加剂,已经被广泛应用于矿山,但泵送剂对料浆凝固后充填体力学性能的影响却尚不明确。针对某矿不同泵送剂掺量的充填料浆,开展了料浆塌落度试验、流变试验 、充填体试块单轴抗压强度试验及试块电镜细观试验。结果表明:泵送剂对塌落度呈非线性梯度影响,随着泵送剂掺量不断增加,同剂量的泵送剂对塌落度的影响能力慢慢减弱;屈服应力与塑性黏度均随泵送剂掺量 的增加而降低,泵送剂掺量在超过3%后,屈服应力的下降幅度明显减缓,而对于塑性黏度,掺量超过2%时,其下降幅度就已经开始明显减缓;泵送剂对3 d养护龄期试块强度的影响较弱,而对于7 d、28 d养护龄期试 块,掺量为1%和2%时,对充填体抗压强度的影响是正面的,当掺量大于2%时,充填试块抗压强度呈下降趋势;掺量在1%时充填试块的细观结构是最致密的,随着泵送剂掺量的增加,大孔隙逐渐增加。综合考虑泵送剂 成本、料浆流动性及抗压强度,针对试验中的料浆配比,推荐泵送剂掺量为2%。

关键词: 充填开采, 泵送剂, 流动性能, 抗压强度, 细观结构

Abstract: Pumping agent has been widely used in mines as an additive to improve the fluidity of slurry, but the effect of pumping agent on filling body mechanical properties is not clear. For this reason, the slurry slump and rheological of filling slurry, and the uniaxial compressive strength and microscopic structure of the filling body with different pumping agent dosage were tested. The results show that the pumping agent has a nonlinear gradient effect on the slump. With the increasing of pumping agent dosage, the influence of the same dosage on the slump is gradually weakened. Both the yield stress and the plastic viscosity decrease with the increasing of the pumping agent dosage. The drop of the yield stress is obviously slowed down after the pumping agent dosage exceeds 3%. For the plastic viscosity, when the dosage exceeds 2%, the decrease rate has begun to slow down significantly. The effect of pumping agent on the filling body strength at 3 d age is inconspicuous. For 7 d and 28 d age strength, the effect is positive when the dosage is 1% and 2%, but it is negative when more than 2%. When the dosage is 1%, the microstructure of the sample is the most compact. As the pumping agent dosage increases, the macro voids gradually increase.Considering the pumping agent cost, the slurry fluidity, and the filling body compressive strength, for the ratio of the slurry in the test, the recommended dosage of the pumping agent is 2%.

Key words: filling mining, pumping agent, fluidity, compressive strength, microstructure