淮南矿区A组煤开采工作面底板破坏带深度确定
Depth determination of floor crack zone in coal mining face of Group A in Huainan Mining Area
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摘要: 淮南矿区生产矿井已开采受深部高承压水严重威胁的A组煤，为了解决传统煤层底板采动破坏深度经验公式适用性差的问题；基于淮南矿区生产地质参数，利用统计软件SPSS分析了各类参数的偏相关性，优化了传统破坏深度计算公式，并将拟合公式应用于张集煤矿1612A工作面底板破坏的计算；基于数值模拟、微震监测对公式演算的准确性进行了验证。研究结果表明：煤层厚度等参数与破坏带深度具有相关性；通过拟合得到的新型计算公式计算工作面破坏深度达到27.33 m，与注水试验测得破坏带深度28 m、数值计算深度30 m相吻合；与利用现场监测的微震事件聚集分布得到的底板微破裂集中深度30~35 m相一致。Abstract: The production mines of Huainan Mining Area have already mined Group A coal, which is seriously threatened by deep high-pressure water, in order to solve the problem of the applicability of the traditional coal seam floor mining failure depth empirical formula, based on the production geological parameters of the Huainan Mining Area, the statistical software SPSS is used to analyze the partial correlation of various parameters, optimize the traditional damage depth calculation formula, and apply the fitting formula to the calculation of the floor damage of the 1612A working face in Zhangji Coal Mine; based on numerical simulation and micro-seismic monitoring are used to verify the accuracy of the formula calculation. The research results show that the coal seam thickness and other parameters are related to the depth of the fissure zone; a new calculation formula is obtained by fitting, and the calculated failure depth of the working face reaches 27.33 m, which is consistent with the fracture zone depth of 28 m measured by water injection test and 30 m calculated by numerical method; the concentration and distribution of micro-seismic events monitored on site are used to obtain a concentration depth of 30-35 m for the micro-fracture of the bottom plate.
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