分层开采时断层滑动位移演化特征研究  

Research on evolution characteristics of fault sliding displacement in slicing mining

作　　者：王宏伟[1,2] 王刚 石瑞明[1] 章啸海 Wang Hongwei;Wang Gang;Shi Ruiming;Zhang Xiaohai(School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;State Key Laboratory for GeoMechanics and Deep Underground Engineering,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]深部岩土力学与地下工程国家重点实验室,北京100083

出　　处：《矿业科学学报》2021年第6期688-695,共8页Journal of Mining Science and Technology

基　　金：北京市自然科学基金(8202041);国家自然科学基金(41872205);中国矿业大学(北京)“越崎青年学者”项目(2018QN13)。

摘　　要：本文结合义马煤田地质构造,以千秋矿21221工作面为工程背景,进行了采动影响下断层滑移失稳相似模拟实验研究,探究了煤层分层开采扰动对断层滑移失稳的影响特征规律。结果表明,煤层上分层开采时顶板已发生较大程度的松动及离层现象,下分层开采时,顶板岩层进一步发生垮落现象,下分层开采扰动引发上覆岩体垮落范围更大,使断层周围位移变化更强烈、上下盘错动更明显、煤岩体中积聚的应变能峰值更高;同时,断层滑移滞后于煤岩体中应变能的剧烈释放,应变能峰值“突降”现象可作为判断断层滑移失稳的前兆;煤层下分层开采较上分层开采时能量剧烈释放的时间更早,更易诱发冲击地压灾害的产生。Based on the geological structure of Yima coalfield and working face 21221of Qianqiu Mine as the engineering background,this paper designs a similar simulation experiment of fault slip instability under the influence of mining,and explores the characteristics of the influence of coal slicing mining disturbance on fault slip instability law.The results show that because the upper layer of the coal seam has caused a large degree of loosening and separation of the roof,when the lower layer of the coal is mined,the original loose roof rock further collapses,so the lower layer of the coal is mined Disturbance triggers a larger collapse range of the overlying rock mass,which makes the displacement changes around the fault become more intense,and the phenomenon of upper and lower disk displacement is more obvious.The strain energy peak accumulated in the coal rock mass is larger;at the same time,the fault slip is relatively lagging behind the violent release of strain energy in the rock mass of the coal,so the“sudden drop”phenomenon of the peak strain energy can be used as a precursor to judge fault slip and instability;the violent release of energy in the lower layer mining is earlier than the upper layer mining,and it is easier to induce the occurrence of rock-burst disasters.

关 键 词：分层开采 断层滑移 应变能 失稳前兆 

分 类 号：TD324[矿业工程—矿井建设]