为了解决天欣煤矿井下长距离过断层巷道顶板存在不对称破坏,影响作业安全性的问题,以A802切眼工程为研究对象,利用点阵图像分析技术对巷道顶板的破坏特性进行了分析,确定了顶板的破坏特点;利用UDEC数值模拟分析的方法对长距离过断层巷道顶板的破坏原理进行了模拟分析,针对性地提出了“不对称支护控制+深浅交替注浆+加强综合支护”的优化方案。根据实际应用表明,过断层巷道顶板表现出了非常显著的不对称变形破坏;在施工过程中,围岩的浅层区域首先发生拉张破坏,裂隙逐步扩展到顶板处并随作业时间的增加逐步扩大,最后导致顶板出现不对称破坏;通过新的控制方案优化后,能够显著降低顶板的变形量,确保了A802切眼工程的顺利实施。

In order to solve the problem of asymmetric failure existing in the roof of downhole long distance crossing fault roadways in Tianxin Coal Mine, which affects the safety of operations, the A802 hole cutting project is taken as the research object. The failure characteristics of the roadway roof are analyzed using dot matrix image analysis technology, and the failure characteristics of the roof are determined; The failure principle of the long distance crossing fault roadway roof is simulated and analyzed using UDEC numerical simulation analysis method, and a targeted optimization scheme of "asymmetric support control+alternating deep and shallow grouting+strengthening comprehensive support" is proposed. According to practical applications, the crossing fault roadway roof exhibits significant asymmetric deformation and failure; During the construction process, the shallow layer area of the surrounding rock first experiences tensile failure, and the cracks gradually expand to the roof and gradually expand with the increase of operation time, ultimately leading to asymmetric failure occurs in the roof; After optimizing the new control scheme, the deformation amount of the roof can be significantly reduced, ensuring the smooth implementation of the A802 hole cutting project.