深部沿空掘巷窄煤柱留设及覆岩稳定性模拟研究

Simulation Study on Narrow Coal Pillars in Deep Roadway Driving along Goaf and Overburden Stability

针对山西某矿2224工作面巷道变形严重的问题,基于理论分析和数值模拟研究分析了沿空掘巷窄煤柱留设尺寸及其对覆岩结构稳定性的影响,首先理论确定窄煤柱留设尺寸为6.2~7.0 m;然后从垂直应力、位移和塑性区等方面进行窄煤柱尺寸合理性验证,确定合理窄煤柱宽度为7 m;最后基于工作面实际条件,确定覆岩结构在研究所得煤柱尺寸下能保持较好的稳定。研究结论能为该矿井生产提供较好的借鉴和指导意义。

In view of the serious deformation of the 2224 working face roadway in a mine in Shanxi,analyzes the influence of the size of the narrow coal pillars along the goaf and its influence on the stability of the overburden structure based on theoretical analysis and numerical simulation.Firstly,the narrow coal pillar is determined theoretically and the size range is 6.2 to 7.0 m;then the rationality of narrow coal pillar size is verified from the aspects of vertical stress,displacement and plastic zone,and the reasonable narrow coal pillar width is determined to be 7 m.Finally,based on the actual conditions of the working face,the overburden structure is determined.The coal pillar size obtained in the study can maintain good stability.The research conclusions can provide a good reference and guiding significance for the mine production.