大采高沿空掘巷留设煤柱合理宽度研究与实践

Study and Application on ReasonableWidth of Coal Pillars Retained in Roadway with Large Mining Height

沿空掘巷容易对周围岩层造成二次影响,伴随围岩变形的增大矿压显现强烈,合理的护巷煤柱宽度成为沿空掘巷的关键。为了厘清沿空掘巷的合理宽度煤柱留设,以山西某煤矿为工程背景,利用理论研究与数值模拟相互印证的方法,得出最佳契合现场条件的煤柱宽度。经现场实测,煤柱宽度为8 m时,可有效控制沿空巷道围岩变形量,有利于维护大采高工作面沿空巷道及煤柱自身的整体稳定性。

The surrounding rock mass is easily affected by the secondary mining,the surrounding rock deformation of the road-way is obvious,the mine pressure is strong,and the reasonable width of the coal pillars of the roadway has become a key factor for the successful implementation of the roadway driving technology.In order to study the reasonable retention width of coal pillars along the goaf,a coal mine in Shanxi is used as the engineering background,and the combination of theoretical research and numeri-cal simulation is used to obtain a reasonable width of coal pillars.The field test results show that when the coal pillar width is 8m,it can effectively control the surrounding rock deformation of the roadway along the goaf,which is conducive to maintaining the over-all stability of the roadway along the empty mining roadway and the coal pillar itself.