Coal bump prevention method for coal seams with large thrust fault in Yima mining area
The activation of large faults leads to frequent occurrence of coal bump disasters in coal mine.Ensuring sufficient distance between the mining face and fault is one of the key measures to control such coal bump disasters.Taking the large thrust fault in Yima mining area as an example,we analyzed the spatial shape and movement characteristics of the fault and their correlation with coal bump based on geological borehole detection and settlement observation.According to the induction of coal bump behavior and similarity simulation of fault slip,the number of coal bump was negatively related to the distance of face-fault,and the safe distance between the working face and the fault to avoid fault slip was obtained.The mining face supersedure scheme under thrust fault conditions was formulated,and the coal bump prevention effect was evaluated with microseismic monitoring.The results show that the fault plays a dominant role in the horizontal stress environment of the shallow part,and the surface uplift of the hanging wall of the fault is higher than that of the footwall during the fault slip which induces the coal bump in the mining face.The closer the face is to the fault,the more obvious the fault movement is,the higher the frequency and energy of coal bump behavior;and the minimum safe distance between the working face and the fault to avoid fault activation is 455 m.Compared with the mining face near the fault,it significantly reduces the fault activation frequency,coal bump degree and microseismic energy during mining of far-fault face in the area of Yuejin and Changcun Coal Mine.The results provide a theoretical basis for the control technology of coal bump under the condition of large faults.
coal bumpthrust faultfault activationsafe distance between mining face and faultmining face supersedure
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