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《岩石力学与岩土工程学报(英文版)》 2018-05
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Numerical simulation of spatial distributions of mining-induced stress and fracture fields for three coal mining layouts

Shengwei Li;Mingzhong Gao;Xiaojun Yang;Ru Zhang;Li Ren;Zhaopeng Zhang;Guo Li;Zetian Zhang;Jing Xie;State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University;State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology;MOE Laboratory of Deep Underground Science and Engineering, College of Architecture and Environment, Sichuan University;China Three Gorges Projects Development Co., Ltd.;  
In this study, the spatial distributions of stress and fracture fields for three typical underground coal mining layouts, i.e. non-pillar mining(NM), top-coal caving mining(TCM) and protective coal-seam mining(PCM), are modeled using discrete element software UDEC. The numerical results show that different mining layouts can lead to different mining-induced stress fields, resulting in diverse fracture fields. For the PCM, the mining influenced area in front of the mining faces is the largest, and the stress concentration factor in front of the mining faces is the lowest. The spatial shapes of the mining-induced fracture fields under NM, TCM and PCM differ, and they are characterized by trapezoidal, triangular and tower shapes, respectively. The fractal dimensions of mining-induced fractures of the three mining layouts decrease in the order of PCM, TCM and NM. It is also shown that the PCM can result in a better gas control effect in coal mines with high outburst potential. The numerical results are expected to provide a basis for understanding of mining-induced gas seepage fields and provide a reference for highefficiency coal mining.
【Fund】: financially supported by the State Key Research Development Program of China(Grant No.2016YFC0600701);; the National Natural Science Foundation of China(Grant No.51674170)
【CateGory Index】: TD821
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