深部软岩巷道立体交叉硐室群稳定性分析

Analysis of the Stability of Intersecting Chambers in Deep Soft-Rock Roadway Construction

为了确定巷道开挖顺序对硐室群稳定性的影响,运用三维有限差分数值计算软件FLAC3D,结合鹤岗矿务局兴安矿四水平泵房吸水井硐室群工程实例,分析了深部软岩巷道立体交叉硐室群围岩由于开挖顺序的不同而产生不同的位移变形与应力状态的力学响应及变形特性.结果表明:深部软岩巷道立体交叉硐室群的开挖过程是和应力路径与应力历史密切相关的非线性不可逆过程,开挖顺序不同,巷道围岩的位移及应力分布情况有明显的差别.先施工断面小的支巷,再施工断面大的主巷对硐室群稳定性影响最小.

The finite difference software, FLAC^3D, was used to study the influence of excavation sequence on chamber stability. The Xing＇ an mine, Hegang mining office, was modeled and deformation during pumping and tunneling were studied. The results show that the stability of the underground engineering structures is influenced by the excavation process. The excavations are nonlinear, irreversible processes closely associated with the path of stress. The displacement and stress distributions surrounding the tunneling area change depending on the excavation sequence. The stability of the entire operation is best when the sub-tunneling is excavated prior to commencing main tunneling.