松软煤层大巷围岩变形机理及控制对策

Deformation mechanism and control measures of surrounding rock in soft coal seam roadway

针对潞安漳村矿井深埋煤巷持续大变形难题,在开展地应力、煤岩体强度及围岩结构测试的基础上,分析了软弱围岩破坏变形的机理;基于强力一次支护原则提出了高预应力强力锚喷支护方案,重点对煤帮进行短锚索补强支护。矿压监测结果表明,掘巷阶段巷道顶板最大下沉量16 mm,两帮最大收敛量153 mm,底板变形不明显,锚杆锚索受力在掘进工作面推过50 m时开始稳定,锚杆受力最大值稳定在154 k N,锚索受力最大值稳定在235 k N。研究成果可为类似采矿条件下煤巷支护提供经验指导。

In order to solve the problem of continued large deformation of the deep buried coal roadway in Lu′an Zhangcun Coal Mine,the mechanism of the deformation and failure of soft surrounding rock was analyzed after the tests of in-situ stress,coal and rock mass strength and surrounding rock structure.Based on the principle of strong and primary supporting,the combination of high prestressed bolt and cable supporting program was proposed and the side column of coal pillar was designed to be reinforced by short cables.The mine pressure monitoring showed that the maximum subsidence of roadway roof was 16 mm,the maximum convergence of two sides was 153 mm and the deformation of floor was not obvious.The stress of bolt and anchor cable began to stabilize when the driving face passes through 50 m.The maximum force of bolt was stable at 154 kN,and the maximum force of anchor cable is stable at 235 kN.The research results can provide experience guidance for coal roadway supporting under similar mining conditions.