火区下煤层群开采裂隙发育规律研究

Study on Law of Fracture Development in Multi-seam Mining below Fire Area

为保证火区下煤层群开采的安全可行,对石圪节3#煤层火区下煤层群开采形成的裂隙发育高度进行了理论计算,得出了3#煤层开采对底板的破坏深度及下组煤开采形成的裂隙发育高度,并对裂隙的分布规律进行了分析。同时,利用UDEC软件对开采造成的裂隙发育规律进行了数值模拟,模拟结果与计算结果基本相符,得出8#与9#煤层开切眼及停采线各内错10m时,裂隙发育高度及贯通程度较小。

In order to keep the multi-seam mining safely below the fire area in seam 3# in Shi Gejie mine,the fracture development depth for the multi-seam mining was calculated.Then the floor failure depth for seam 3# mining and the fracture height for lower coal group mining were educed,and also the fracture distribution was analyzed.Simultaneity,the fracture development was simulated by UDEC,which accords with the calculated result.The fracture height and transfixion were small when the open of cut and stopping line in 8# 9# seams were both internally staggered for 10 meters.