深井特厚煤层综放工作面断层活化规律研究

doi:10.13722/j.cnki.jrme.2014.1574

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Abstract The mechanism of the fault activation in the extra-thick coal seam of deep shaft at the fully mechanized caving face 2301N passing through a fault in Xinjulong Mine was studied using micro seismic monitoring，numerical simulation and theoretical analysis. The process of fault activation was divided into a stress appearance stage(at a distance of 274.8–214 m from the fault)，an energy storage stage(at a distance of 214–84 m from the fault) and a structure activation stage(at a distance of 84–0 m from the fault) according to the microseismic monitoring results，which was verified by numerical simulation. Two kinds of rock burst，fault-activated rockburst and fault-coal-pillar rock burst，both occurred when the working face passed through the fault. The mechanism of fault-activated rock burst was attributed to the accumulated tectonic stress release in both sides of the coal-rock mass adjacent to the fault，and the mechanism of fault-coal-pillar rock burst resulted from the high stress concentration caused by mining activities in fault coal pillar. The corresponding control technologies were put forward based on the analysis of the rock burst mechanisms in the process of working face passing through the fault. The field application of these technologies has effectively ensured the safety of mining passing through the fault.

Key words： mining engineering deep shaft extra-thick coal seam microseismic monitoring fault activation

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2014.1574 OR http://www.rockmech.org/EN/Y2016/V35/I1/50

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