Inversion of mining-induced stress field and its application based on focal mechanism solution
LI Tie1，2，CAI Meifeng1，2，SUN Lijuan3，ZUO Yan3
(1. State Key Laboratory of High-efficiency Mining and Safety of Metal Mines，Ministry of Education，University of Science and Technology Beijing，Beijing 100083，China；2. School of Civil and Environment Engineering，University of Science and
Technology Beijing，Beijing 100083，China；3. Fushun Seismological Bureau，Fushun，Liaoning 113006，China)
Abstract：To inverse mining-induced stress field，a research program was conducted at the Laohutai mine. A solution of rock rupture in seismology was applied to solve the focal mechanisms of 81 large seismic events observed in the mine field. Combined with field investigation and in-situ stress measurement，the evolution of the principal stress field in the mine field was analyzed. It was found that the principal stress was not uniform due to the influence of fault and different mining sequences and various zones were identified. Compared with the original in-situ stress field， the orientation of the minimum mining-induced principal stress changed from roughly horizontal to near vertical. Under the influence of mining-induced stress，a normal fault in deep levels not only became a fluid storage body and flow path but also was activated and changed into a thrust fault，potentially to release a large amount of seismic energy. The focal solution is useful for studying the pillar instability，roof caving，and normal fault thrust catastrophe，thrust fault activation. It was seen that for mines equipped with microseismic monitoring system，tracking and inversing rock mass fracture source mechanism during mining can detect potentially the fault activation at an early stage and thus precaution can be taken promptly.
李 铁1，2，蔡美峰1，2，孙丽娟3，左 艳3. 基于震源机制解的矿井采动应力场反演与应用[J]. 岩石力学与工程学报, 2016, 35(9): 1747-1754.
LI Tie1，2，CAI Meifeng1，2，SUN Lijuan3，ZUO Yan3. Inversion of mining-induced stress field and its application based on focal mechanism solution. , 2016, 35(9): 1747-1754.
李 铁，王金安，刘 军. 深部采动断层异变的强制逆冲机制[J].岩石力学与工程学报，2014，33(2)：3 760-3 765.(LI Tie，WANG Jin′an，LIU Jun. Forced thrust mechanism of fault mutation in deep mining[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(2)：3 760-3 765.(in Chinese))
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2016, Vol. 35 
