微生物浸出过程中裂隙岩块损伤试验研究
摘要
矿岩所处环境对其力学性能的影响至关重要,现已有大量学者进行了普通溶液对矿岩损伤的相关研究,但以微生物溶浸采矿做为背景进行的研究还尚未看到。本文首次以这一领域做为研究背景,初步探讨了含菌溶浸液对裂隙矿岩损伤的机理和主要影响因素。
论文结合“973”国家重点基础研究发展规划项目“微生物浸出体系多因素强关联”(2004CB619205)、国家杰出青年科学基金项目“散体多相介质中多级渗流传质的动力学研究”(50325415)和国家自然科学基金项目“应力波作用下溶浸液在堆浸散体介质中的流动机理研究”(50574099)等项目的部分研究内容,在前人的研究基础上,以促进矿岩中目的金属的高效浸出和地下破碎浸出采场的安全生产为目的,以含菌溶浸液对裂隙矿岩单轴抗压强度的降低作为研究主线,通过理论分析、室内试验、数值模拟等方法主要完成了以下几个方面研究工作:
①研究了溶浸液在裂隙岩块中的渗流规律,分析探讨了单一裂隙在不同渗流状态下的渗流特征以及现有的岩体渗流模型;
②简述了浸矿用微生物的生物学基础,并通过选育试验找到了适合本次浸出试验的细菌菌种;
③分析探讨了溶浸液与裂隙岩块的反应机理;总结了微生物在浸出这一过程中的作用机理;简要介绍了由粒间薄流体层扩散控制的锯齿状颗粒边缘滑动的岩块损伤模型;
④通过溶浸液对裂隙岩块损伤的试验研究,得出了中粒含铜磁黄铁矿(A组)、含铜矽卡岩矿石(S组)两组试件在含菌溶浸液影响下损伤因子与试验设计因素之间的定量关系;定性分析了在这一过程中试件初始弹模、切线弹模以及泊松比的变化规律;并对浸出前后试件表面形貌变化做了简要分析;
⑤利用COMSOL Mutiphysics软件模拟了溶浸液在边长为1m,内部含有一贯通裂隙岩块中的渗流。
The influences of surrounding environment of mine rock on its mechanical property are significant.Many scholars have done some research works in the field of rock damage in ordinarily solution.But the research works which take the microbe solution mining as study background has not been carried on so far.
With this research background,the paper carried on some preliminary study on the damage mechanism and the effect laws of solution with bacterium to the fracture mine rock for the first time.
The research work is supported by The National Key Fundamental Research and Development Program(2004CB619205):"The Multi-Factor Strong Relating in Leaching System",The National Science Fund for Distinguished Young Scholars of China(50325415):"The Study on Multilevel and Mass transfer in Multiphase Granular Media" and The National Natural Science Found of China(50574099):"The Study on Solution Seepage Mechanics in The Heap Leaching Process With The Stress Wave Effect" etc.Combining with portion research contents of these programs,the paper takes promotion of the valued metal leaching out from the mine rock and safety production of in suit crushed leaching stope as goals.Clutching the research main line tightly,that is the damage of solution with bacterium to fracture mine rock,through using theoretical analysis,indoor experiments,numerical simulation methods etc.the paper mainly has carried on research works as follows:
①Studied the solution seepage regulation of leaching solution in the fracture mine rock;Analyzed solution seepage regulation in the rock with single fracture under different seepage states and the present seepage models.
②Briefly introduced the biology foundation of leaching microbe, and found the proper bacterium to this leaching testing by seed selection testing.
③Analyzed the reaction mechanism of leaching solution and fracture rock mass damage;Summarized the action mechanism in the process of microbe leaching;briefly introduced the serration granule edge slip model that controlled by tenuity fluid layer in granule separate space diffusion.
④Through the experiment of fracture rock damage caused by leaching solution,the definite quantity relationship between A&S sample group's damage facts and experimental design factor has concluded under the effect of leaching solution;Qualitatively analysed the variation laws of the initial elastic ration,tangent elastic ration and the poisson ratio in the microbe leaching process;compared the surface topography of rock sample before and after leaching.
⑤Simulating the seepage process in the rock whose length of side is 1m and in which has a breakthrough fracture by using the COMSOL MUTIPHYSICS software.
论文结合“973”国家重点基础研究发展规划项目“微生物浸出体系多因素强关联”(2004CB619205)、国家杰出青年科学基金项目“散体多相介质中多级渗流传质的动力学研究”(50325415)和国家自然科学基金项目“应力波作用下溶浸液在堆浸散体介质中的流动机理研究”(50574099)等项目的部分研究内容,在前人的研究基础上,以促进矿岩中目的金属的高效浸出和地下破碎浸出采场的安全生产为目的,以含菌溶浸液对裂隙矿岩单轴抗压强度的降低作为研究主线,通过理论分析、室内试验、数值模拟等方法主要完成了以下几个方面研究工作:
①研究了溶浸液在裂隙岩块中的渗流规律,分析探讨了单一裂隙在不同渗流状态下的渗流特征以及现有的岩体渗流模型;
②简述了浸矿用微生物的生物学基础,并通过选育试验找到了适合本次浸出试验的细菌菌种;
③分析探讨了溶浸液与裂隙岩块的反应机理;总结了微生物在浸出这一过程中的作用机理;简要介绍了由粒间薄流体层扩散控制的锯齿状颗粒边缘滑动的岩块损伤模型;
④通过溶浸液对裂隙岩块损伤的试验研究,得出了中粒含铜磁黄铁矿(A组)、含铜矽卡岩矿石(S组)两组试件在含菌溶浸液影响下损伤因子与试验设计因素之间的定量关系;定性分析了在这一过程中试件初始弹模、切线弹模以及泊松比的变化规律;并对浸出前后试件表面形貌变化做了简要分析;
⑤利用COMSOL Mutiphysics软件模拟了溶浸液在边长为1m,内部含有一贯通裂隙岩块中的渗流。
The influences of surrounding environment of mine rock on its mechanical property are significant.Many scholars have done some research works in the field of rock damage in ordinarily solution.But the research works which take the microbe solution mining as study background has not been carried on so far.
With this research background,the paper carried on some preliminary study on the damage mechanism and the effect laws of solution with bacterium to the fracture mine rock for the first time.
The research work is supported by The National Key Fundamental Research and Development Program(2004CB619205):"The Multi-Factor Strong Relating in Leaching System",The National Science Fund for Distinguished Young Scholars of China(50325415):"The Study on Multilevel and Mass transfer in Multiphase Granular Media" and The National Natural Science Found of China(50574099):"The Study on Solution Seepage Mechanics in The Heap Leaching Process With The Stress Wave Effect" etc.Combining with portion research contents of these programs,the paper takes promotion of the valued metal leaching out from the mine rock and safety production of in suit crushed leaching stope as goals.Clutching the research main line tightly,that is the damage of solution with bacterium to fracture mine rock,through using theoretical analysis,indoor experiments,numerical simulation methods etc.the paper mainly has carried on research works as follows:
①Studied the solution seepage regulation of leaching solution in the fracture mine rock;Analyzed solution seepage regulation in the rock with single fracture under different seepage states and the present seepage models.
②Briefly introduced the biology foundation of leaching microbe, and found the proper bacterium to this leaching testing by seed selection testing.
③Analyzed the reaction mechanism of leaching solution and fracture rock mass damage;Summarized the action mechanism in the process of microbe leaching;briefly introduced the serration granule edge slip model that controlled by tenuity fluid layer in granule separate space diffusion.
④Through the experiment of fracture rock damage caused by leaching solution,the definite quantity relationship between A&S sample group's damage facts and experimental design factor has concluded under the effect of leaching solution;Qualitatively analysed the variation laws of the initial elastic ration,tangent elastic ration and the poisson ratio in the microbe leaching process;compared the surface topography of rock sample before and after leaching.
⑤Simulating the seepage process in the rock whose length of side is 1m and in which has a breakthrough fracture by using the COMSOL MUTIPHYSICS software.
引文
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