上行开采厚硬层间岩层移动变形数值模拟分析

煤矿采用上行开采方式时,层间岩层移动变形规律是决定上行开采可行性的关键因素。以同家梁煤矿为工程背景,研究上行开采厚硬层间岩层移动变形问题,结合煤层赋存条件、煤层开采情况及层间岩层物理力学性质和特征等相关因素,对8#煤层上行开采层间岩层的移动变形规律进行数值模拟分析。结果表明位于上行开采工作面后方岩层随工作面推进竖向位移变大,位于工作面前方岩层竖向位移先增大后减小;随岩层深度增加,岩层受上行开采工作面二次采动影响程度变小,岩层的竖向位移和塑性破坏区域范围减小。研究成果为判定上行开采可行性提供理论依据。

Numerical Simulation Analysis of Movement and Deformation of Thick and Hard Rock Strata between Coal Seams in the Ascending Mining

During the process of the ascending mining in coal mine，the movement and deformation rules of interlayer rock are the key factors to affect the feasibility of ascending mining in coal mines.Taking Tongjialiang Coal Mine as engineering background to study the movement and deformation problem of hard and thick strata，and combining the occurrence of coals，mining condition，physical mechanical properties and characteristics of strata，the movement and deformation rules in 8# coal seam were analyzed by numerical simulation.The results showed that the vertical displacement of interlayer rock located at the rear of ascending mining working face became larger with the advancing，and the vertical displacement of interlayer rock located in front of the working face increased first and then decreased.The influence of second mining at ascending mining working face becomes small with the depth of rock strata increasing，and the vertical displacement and plastic damage area of interlayer rock decrease.The research results provide a theoretical basis for judging the feasibility of ascending mining.