显德汪煤矿9号煤层底板破坏规律的研究

Research of No.9 coal seam floor's fracture regularityin Xiandewang Coal Mine

根据显德汪煤矿三维地应力测量数据,利用3D-σ程序模拟了不同水平煤层的开挖效应,计算了各水平回采后围岩应力、位移和破坏区的分布状况,分析了9号煤层底板变形破坏规律,得到了煤层底板最大破坏深度计算公式.显德汪煤矿9号煤层底板最大破坏深度为9 15m.

According to the data of insitu stress measurement in Xiandewang Coal Mine,by usage of 3D-σ program, simulated the dig effect at the different level, calculated the stress and displacement of the surrounding rock and distributive state of the fracture area after extraction at the different level. The influence regularity of coal seam floor was analyzed, the equation of the coal seam floor's failure depth was provided. It is 915 m that the most data of No9 coal seam floor's fracture in Xiandewang Coal Mine.