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为反演采动应力场,以老虎台矿井为研究背景,应用地震学的岩体破裂震源机制解答方法,求解出矿井范围81个强矿震的震源机制,结合现场调查和地应力测量,分析矿井尺度岩体采动应力场的规律。研究发现:由于不同性质断层的切割和不同的采动方式,导致采动过程矿井范围岩体主应力性质并非一致,表现出分区特征;一个共性特征是,相对于原岩应力场,采动应力场最小主应力轴由近水平转变为近垂直;进入深部开采,正断层不只是流体的存储空间和运移通道,其在采动应力作用下可活化异变为逆冲断层运动,并可灾变为强矿震能量释放;震源机制解对矿柱失稳、顶板大规模垮落、正断层逆冲灾变、逆断层活化等具有明确指示意义。矿井布设工程度微震监测系统,跟踪、反演分析采动过程岩体破裂机制,可以超前发现采动断层活化与异变成灾趋向,及时采取防范措施。
In order to reverse the mining stress field, taking the Laohutai mine as a research background, the focal mechanism of 81 strong earthquakes in the mine area was solved by applying the seismological solution method of rock mass focal mechanism. Combined with field investigation and in-situ stress measurement, Laws of mining stress field in rock scale rock mass. The results show that due to the cutting of different faults and different mining methods, the main stress of the rock mass in mining process is not consistent and the characteristics of subarea are shown. One common characteristic is that the mining stress The minimum principal stress axis of the field transforms from near horizontal to near vertical. When it enters deep mining, the normal fault is not only the fluid storage space and migration channel, but it can be activated and transformed to thrust fault movement under mining stress and can be catastrophic It is clear that the solution of source mechanism has clear indication to the instability of pillar, large-scale roof caving, thrust fault catastrophe of normal fault and reverse fault activation. Mine cloth degree of engineering microseismic monitoring system, tracking, back analysis of mining process rock mass rupture mechanism, can be found ahead of the mining fault activation and mutation disaster trends, timely preventive measures.