Yanzishan Mine, Jinneng Holding Coal Industry Group

采用理论分析、数值模拟以及现场实际检验等多重研究方法,对燕子山煤矿煤岩互层巷道的失稳现象进行研究。基于经典的莫尔强度包络线理论,水平应力是导致此类巷道顶板出现大范围剪切位移、贯通性裂隙以及围岩破坏的主要作用力;利用有限元数值模拟,对煤岩互层巷道的围岩变形破坏过程进行了模拟分析;提出了预应力锚索与锚杆相结合的耦合强化支护方案。应用结果表明,支护方案显著增强了互层巷道围岩的稳定性,6个月巷道围岩变形量为5.34mm,证实了支护方案的有效性和可靠性。

Adopting multiple research methods such as theoretical analysis, numerical simulation, on-site practical testing and others to study the instability phenomenon of the coal rock interbedded roadway in Yanzishan Coal Mine. Based on the classical Mohr strength envelope theory, horizontal stress is the main force causing large-scale shear displacement, connectivity cracks, and surrounding rock failure occur in such roadway roofs; Finite element numerical simulation is used to simulate and analyze the deformation and failure process of surrounding rock in coal rock interbedded roadway; A coupled reinforcement support scheme combining prestressed anchor cables and anchor rods is proposed. The application results show that the support scheme significantly enhances the stability of the surrounding rock of the interbedded roadway, with a deformation amount of 5.34 mm in the roadway surrounding rock after 6 months, confirming the effectiveness and reliability of the support scheme.