太平煤矿煤层开采覆岩压分布与裂隙带预测

摘要

This paper deals with distribution of overlying strata pressure in seam mining in the Taiping Coal Mine by use of FLAC. The results indicate that stress of wall rock near by mined-out area changes with stoping, stress near by safely pillar changes with stoping, and transmission fissure zone results from plastic deformation of upper safely pillar when coal is mined-out.%运用求解非线性大变形问题有限差分法(FLAC),对攀枝花宝鼎矿区太平煤矿第二水平 1#、3#和 5#急倾斜多煤层开采采场围岩压分布、裂隙带特征进行了究研.结果表明:①在进行三个煤层回采工作过程中,采空区附近的围岩应力不断变化;②保护煤柱附近的煤层回采时,在煤柱附近会形成应力集中区域,当回采工作继续向下进行时,采空区又对保护煤柱产生类似于"解放"的效果,煤柱附近的应力集中现象得到缓解;③在煤层回采完后,上部保护煤柱发生塑性破坏,形成了导水通道.