破碎顶板松软煤层巷道破坏机理及高预应力支护技术研究

根据易东煤矿采区巷道顶板为破碎顶板,两帮强度低,传统棚式支护难以控制围岩变形量大这一问题,基于实验室力学性能测试及巷道围岩控制理论,采用理论分析及数值模拟计算的方法,对破碎顶板松软煤层巷道的破坏机理及高性能预应力支护体系进行了研究,得出了巷道围岩连锁失稳、破坏机理及其相关解决技术。现场工业性试验表明,采用高性能预应力支护技术后,顶板下沉量为44 mm,两帮移近量为117 mm,离层量控制在32 mm以内,效果良好,得出高性能预应力锚杆支护可以较好控制复合顶板松软煤层巷道的围岩变形,提高巷道的整体稳定性。

Failure Mechanism of Roadway Deformation in Soft Coal Seam with Composite Roof and High Prestressed Forced Supporting

For composite roadway roof of Chongsheng colliery and low intensity on both sides of the roadway.Using the traditional shed style supporting is difficult to control large rock deformation.Based on the Mechanical Testing and roadway control theory,soft coal seam compound roof destruction mechanism and performance support system is revealed prestressed by using theoretical analysis and numerical simulation methods.Roadway chain instability and destruction mechanism and its associated solutions is explained.Industrial test showed that roof subsidence is 44mm,the moved closer amount of the roadway is 117mm,separation is less than 32mm when using the High-performance prestressed supporting technology.Conclusion is that the High-performance prestressed bolting can control the surrounding rock deformation of the complex roof soft coal roadway and improve the overall stability of the roadway.