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根据深部软岩煤巷围岩力学性质,借助有限差分软件FLAC程序,模拟软岩煤巷开挖未支护巷道和U型钢支护巷道围岩变形破坏全过程,得到围岩应力场、位移场和塑性区变化规律。结果表明,解决底板问题是维护深部软岩煤巷整体稳定的关键,巷道底鼓与两帮收敛两者是相互关联的,提高围岩本身强度参数是围岩控制的重点。由此提出大刚度高阻力联合支护技术,即应用高阻力预应力锚杆进行锚网支护的基础上,以注浆加固和反底拱对底板进行控制,同时配合大刚度U型钢支护,适时实施围岩二次注浆加固及锚索加强支护,且将此技术应用于工程实践。
According to the mechanical properties of the surrounding rock of deep soft rock roadway, the finite difference software FLAC program was used to simulate the whole process of surrounding rock deformation and failure in the excavation of unsupported roadways and U-shaped steel supporting roadway in soft rock roadway. The stress and displacement fields And plastic zone changes. The results show that to solve the problem of floor is the key to maintain the overall stability of deep soft rock roadway. The bottom drum and the convergence of tunnel are interrelated. Improving the strength parameters of surrounding rock itself is the key point of surrounding rock control. Based on this, the joint support technology of high stiffness and high resistance is put forward, that is, the anchor plate is controlled by grouting reinforcement and anti-under-arch based on the bolting with high-resistance prestressed anchors. At the same time, , Timely implementation of secondary grouting reinforced rock and anchor reinforcement support, and the application of this technology in engineering practice.