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Key technologies and engineering practices for soft-rock protective seam mining

International Journal of Mining Science and Technology 2020年第6期30卷 889-899页

作者： Xiang Cheng Guangming Zhao Yingming Li Xiangrui Meng Qingyi Tu State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China Geological Resources and Geological Engineering Post-Doctoral Flow Station Anhui University of Science and TechnologyHuainan 232001China Post-Doctoral Research Station Huaibei Mining Corporation LimitedHuaibei 235006China

Severe gas disasters in deep mining areas are increasing,and traditional protective coal seam mining is facing significant *** paper proposes an innovative technology using soft rock as the protective seam in the absence of an appropriate coal *** on the geological engineering conditions of the new horizontal first mining area of Luling Coal Mine in Huaibei,China,the impacts of different mining parameters of the soft-rock protective seam on the pressure-relief effect of the protected coal seam were analyzed through numerical *** unit stress of the protected coal seam,which was less than half of the primary rock stress,was used as the mining stress pressure-relief *** optimized interlayer space was found to be 59 m for the first soft-rock working face,with a 2 m mining thickness and 105 m face *** physicochemical characteristics of the orebody were analyzed,and a device selection framework for the soft-rock protective seam was *** equipment for the working face was selected,including the fully-mechanized hydraulic support and coal cutter.A production technology that combined fully-mechanized and blasting-assisted soft-rock mining was *** practices demonstrated that normal circulation operation can be achieved on the working face of the soft-rock protective seam,with an average advancement rate of 1.64 m/*** maximum residual gas pressure and content,which were measured at the cut hole position of the protected coal seams(Nos.8 and 9),decreased to 0.35 MPa and 4.87 m^3/t,*** results suggested that soft-rock protective seam mining can produce a significant gas-control effect.

关键词： Gas outburst hazard Soft-rock protective seam Pressure-relief three-machine optimization Blasting-assisted mining Gas extraction

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