木瓜煤矿“三软”煤巷小煤柱沿空掘巷技术应用研究

Study on the Application of Small Coal Pillar Driving along Goaf in"Three Soft"Coal Roadway of Mugua Coal Mine

10-102轨道顺槽属于典型的"三软"煤巷,为提高采出率,设计采用小煤柱护巷技术,确定合理的煤柱范围为3~8m,通过数值模拟分析其采用小煤柱沿空掘巷技术的可行性,并确定最佳的煤柱宽度为5.0m。现场应用过程中进行围岩位移观测,10-102轨道顺槽顶底板移近量最大值为87mm,两帮相对移近量最大值为149mm,取得了良好的效果。

The 10-102 track is a typical"three soft"coal roadway.In order to improve the recovery rate,small coal pillar is designed to protect the roadway,and the reasonable range of coal pillar is determined to be 3~8m.Through numerical simulation,the feasibility of small coal pillar driving along the goaf is analyzed,and the optimal width of coal pillar is determined to be 5.0m.In the process of field application,the displacement observation of surrounding rock shows that the maximum value of the approach of 10-102 track along the top and bottom of the trough is 87mm,and the maximum value of the relative approach of the two sides is 149mm,which has achieved good results.