不同开采条件下采动力学行为研究  

Mining-induced mechanical behavior in coal seams under different mining layouts

作　　者：谢和平[1] 周宏伟[2] 刘建锋[1] 高峰[2] 张茹[1] 薛东杰[2] 张勇[2] 

机构地区：[1]四川大学水利水电学院,四川成都610065 [2]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《煤炭学报》2011年第7期1067-1074,共8页Journal of China Coal Society

基　　金：国家重点基础研究发展计划(973)资助项目(2011CB201201);国家科技支撑计划资助项目(2008BAB36B07);国家自然科学基金资助项目(50674092)

摘　　要：通过分析3种典型开采条件下(放顶煤开采、无煤柱开采与保护层开采)工作面支承压力分布规律,揭示了采动影响下工作面前方煤体支承压力峰值大小及位置的采动力学特征,获得工作面前方煤体所承受的采动力学应力环境条件,据此进一步开展了不同开采条件下煤体采动力学行为的实验研究。通过升高轴向应力的同时降低围压的方式来模拟长壁工作面前方垂直应力和水平应力,获得了3种典型开采条件下煤体破坏全过程的采动力学行为和应力集中系数,以及不同开采条件下煤体破坏时的支承压力、水平应力、变形等的差异,同时揭示了工作面前方煤体的采动力学行为与开采条件的关系。By summing up a property of the abutment pressure at long-wall coal face under three typical mining layouts,i.e.,top-coal caving,non-pillar mining and protected coal seam mining,some general mining-induced mechanical characteristics such as magnitude and location of peak stress of abutment pressure were proposed.Furthermore,a stress state of coal in the front of mining face was suggested to determine the loading and unloading parameters for a laboratory study subjected to different mining layouts.The vertical stress（i.e.,an abutment pressure） and the horizontal stress of coal in the front of long-wall mining face were simulated by increasing the axial stress and decreasing the confining pressure simultaneously in a conventional triaxial compression test.As a result,a mining-induced mechanical behavior such as stress-strain curves and peak stresses as well as the differences of vertical stress,horizontal stress and deformation of coal samples among three typical mining layouts are obtained.Additionally,a relation between the mining-induce mechanical behavior of coal in the front of coal mining face and typical mining layouts is suggested.

关 键 词：开采条件 采动力学 放顶煤开采 无煤柱开采 保护层开采 

分 类 号：TD325[矿业工程—矿井建设]