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| Numerical simulation test research on pressure relief effect of expansion-induced fracturing in shock-hazardous coal seams |
| Chen Changpeng1， Wang Jianhua2 |
| 1. School of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China；
2. Xiaoyun Mine, Jining Mining Group Co., Ltd., Jining 272000, China |
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Abstract In order to solve the problems of insufficient pressure relief capacity of the deep coal body in the roadway and limited improvement of the pressure relief effect in the existing large-diameter boreholes for pressure relief, based on the basis of analyzing the coal powder monitoring data before and after the pressure relief of conventional large-diameter boreholes in No. 1318 Face of Xiaoyun Coal mine, a pressure relief method caused by expansion and fracturing was proposed and improved the pressure relief technology of large-diameter holes. By means of numerical simulation, the pressure relief effects of expansion-induced fracturing under different expansion forces were compared and analyzed from the perspectives of the distribution of plastic zone and the stress difference of coal after expansion-induced fracturing. Finally, it was concluded that the implementation of expansion-induced fracturing pressure relief could effectively improve the pressure relief effect of coal body with the roadway side depth of 5 - 10 m. Compared with the conventional large diameter drilling, the pressure relief ability was increased by 136 %, and the pressure relief effect was obvious.
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