厚层砂岩顶板小煤柱沿空掘巷围岩变形规律研究

Deformation Rule of Surrounding Rock of Driving Roadway along Small Coal-pillar under Thick Sand-stone Roof

从分析小煤柱沿空掘巷特殊应力坏境和围岩力学结构入手,理论计算了弧形三角块的变形失稳情况,强调应立足于高强预应力锚杆(索)的支护路线,改善岩体自身的力学性能,从而控制围岩失稳变形。以谢桥煤矿13318E厚层砂岩顶板留小煤柱沿空掘巷工作面为工程背景,分析了留小煤柱沿空掘巷围岩在掘进、回采阶段的变形规律,说明工作面回采时超前应力集中是围岩变形的主要因素,同时得到了沿空掘巷围岩变形的几点有益结论,为类似工程的支护和分析提供借鉴。

Based on the analysis of special stress environment and mechanics structure of surrounding rock of driving roadway along small pillar,applying theoretical method to calculating deformation and instability of arc triangle section.It was obtained that controlling deformation and instability of surrounding rock should improving mechanical properties of rock by applying pre-stress anchored bolt（rope） with high strength.Taking 13318E roadway driving face along small coal-pillar under thick sand-stone roof in Xieqiao Colliery,roadway deformation rules in driving and mining phrases was analyzed.Results showed that advanced stress concentration was the main factor of surrounding rock in mining.Deformation rule of roadway along small coal-pillar might provide reference for similar engineering.