Research on mining stress distribution law of overburden under typical key strata structure
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摘要: 针对目前对煤层支承压力的研究大多基于工作面上覆岩层结构均化处理展开，未充分考虑其内在结构影响的问题，基于岩层控制关键层理论，通过改变关键层位置、厚度等，对典型关键层结构下覆岩采动应力分布规律进行了数值模拟研究。研究结果表明：随着关键层与煤层间距增大，工作面超前支承压力峰值逐渐减小，关键层下方软岩层超前支承压力峰值先减小后趋于稳定，关键层上方软岩层超前支承压力峰值先增大后趋于稳定，应力集中区域范围减小；随着关键层厚度增大，工作面超前支承压力峰值先增大后趋于稳定，上覆岩层超前支承压力峰值逐渐增大，应力集中区域范围增大。Abstract: Most researches on coal-seam abutment pressure are carried out based on homogenizing overburden structure of working face at present, while influence of internal structure of the overburden is not fully considered. For the above problems, based on key strata theory of ground control, mining stress distribution law of overburden under typical key strata structure was researched using numerical simulation through changing location and thickness of key strata. The research results show that with distance increase between key strata and coal-seam, advance abutment pressure peak value in working face decreases gradually, the peak value in soft rock under key strata decreases firstly then becomes stable, the peak value in soft rock over key strata increases firstly then becomes stable, and range of stress concentration area decreases. With increase of key strata thickness, the peak value in working face increases firstly then becomes stable, the peak value in overburden increases gradually, and range of stress concentration area increases.
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期刊类型引用(4)
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