软弱顶底板下沿空掘巷小煤柱合理宽度的确定

Rational width of narrow coal pillar at roadway driven along gob with weak roof and floor

针对软弱顶底板下沿空掘巷的具体生产地质条件,以东怀煤矿3100工作面为研究对象,通过对沿空掘巷上覆岩层结构在掘进和回采期间稳定性的分析,阐述了沿空掘巷围岩稳定的基本原理,认为维护巷道围岩小结构的稳定是沿空掘巷稳定的基础.通过理论计算与数值模拟相结合的方法,确定小煤柱的合理宽度为5 m.经过现场工业性试验,留设5 m小煤柱的方案,能较好满足生产要求,保证工作面顺利回采.

A research has been proceeded at 3100 working face in Donghuai Coal Mine, for the specific geological conditions of the roadway driven along gob with the weak roof and floor. It illustrates the basic principles of roadway driven along gob by analyzing stability of the structural of overlying rock mass when the working face is tunneling and mining. The foundation to maintain surrounding rock stability at roadway driven along gob is to keep the small structure stability. By applying the method of theoretical analysis and numerical simulation, the rational narrow coal pillar width is intended to 5 m. The industrial case study indicates that the requirements in production can be met, and the working face can be mined smoothly by determining the wide of narrow coal pillar width is 5 m.