采动影响下断层滑移失稳的动力学分析及数值模拟  

Dynamic analysis and numerical simulation of fault slip instability induced by coal extraction

作　　者：朱广安[1] 窦林名[1] 刘阳[1] 苏振国[1] 李慧[1] 李静[1] 

机构地区：[1]中国矿业大学矿业工程学院煤炭资源与安全开采国家重点实验室,江苏徐州221008

出　　处：《中国矿业大学学报》2016年第1期27-33,共7页Journal of China University of Mining & Technology

基　　金：国家重点基础研究发展计划(973)项目(2010CB226805);国家自然基金和神华集团有限公司联合资助项目(51174285);煤炭资源与安全开采国家重点实验室自主研究课题(SKLCRSM10X05);江苏高校优势学科建设工程资助项目(PAPD)

摘　　要：为研究开采扰动下断层滑移失稳诱发冲击矿压的致灾条件,基于"砌体梁"理论分析了开采过程中断层围岩系统的受力状态和力学响应.首先推导了断层面正应力、剪应力的计算公式,进而得到断层滑移失稳与覆岩"关键层"的破断和采场的推进的关系;利用数值模拟计算比较了不同开采影响因素下的断层面位移场、应力场、速度场和能量场的响应规律.结果表明:断层滑移对采动影响具有不同的敏感性,断层带上剪切位移和应力分布受断层摩擦角、采深、断层位置和回采方式等影响较大;而受断层力学性质(诸如法向刚度、切向刚度等)影响较小.受采动覆岩演化高度影响,断层带上不同位置处的应力路径变化较大,临近断层处易出现滑移.最大滑移速度和震源参数与最大剪切位移呈正相关关系.The stress state and mechanical response of fault rock system were analyzed based on ＂voussoir beam＂ theory to investigate the rockburst disaster induced by fault slip.The relationship between fault slip as well as key strata breaking and mining process was studied by deducing the normal and shear stress formula.The response of displacement,stress,velocity and energy under different mining factors was compared using numerical simulation.The results show that fault slip shows a different sensitivity to mining.The shear displacement and stress distribution in the fault zone are significantly affected by the friction angle of the fault,depth,location of the fault and mining methods,but faintly affected by fault mechanical properties such as normal stiffness and shear stiffness.Stress path varies greatly at different positions of fault zone and the slip occurs mostly near the fault due to height of overburden failure.The maximum slip velocity and seismic source parameters also show a positive relation with the maximum shear displacement.

关 键 词：断层滑移 冲击矿压 动力学分析 数值模拟 

分 类 号：TD324[矿业工程—矿井建设]