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《Chinese Journal of Underground Space and Engineering》 2017-03
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Experimental Study of Mine-Induced Underlying Strata Failure Regularity in Three Dimensional Stress Condition

Kang Qinrong;Zhang Weizhong;Han Peibo;Zhang Dianji;State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University;School of Resources and Civil Engineering,Wuhan Institute of Technology;  
Based on geological data of 2481 working face in Baijiao coal mine of Sichuan Coal Industry Co.Ltd.,using self-developed "Multi-field coupling of coal mine dynamic disaster simulation test system" to simulate excavating experiment in three-dimensional mine-induced stress condition.By means of stress monitoring,measurement statistics,pigment tracer and photographic sketch,underlying strata failure characteristics was revealed.Results indicate that:(1) the floor strata stress shows a dynamic characteristic of increase before excavating-relief after excavating-rise again during compacting;(2) according to the evolution of fracture,the underlying strata fracture belt can be divided into open-off-cut fracture zone,central goaf compaction zone and working-face fracture zone on strike,and floor crack fracture zone and floor separation zone in vertical;(3) the maximum failure depth of floor reaches 14 m.
【Key Words】: three-dimensional simulation excavating experiment floor fracture bending deformation maximum failure depth
【Fund】: 煤矿灾害动力学与控制国家重点实验室访问学者课题资助(2011DA105287-KF201308);; 武汉工程大学人才专项经费资助项目(K201321);; 湖北省中低品位磷矿资源开发利用协同创新中心开放基金(P201120);; 国家自然科学基金(51474159)
【CateGory Index】: TD325
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