论文部分内容阅读
为进一步研究分岔隧道施工过程中的围岩力学性态,以某正在施工的分岔隧道为工程背景,采用FLAC3D有限差分软件对隧道施工过程进行了数值模拟,研究了分岔隧道施工过程中连拱段围岩及中隔墙的应力、位移分布和变化规律,在此基础上,对隧道施工方案进行了优化分析。研究结果表明:该隧道开挖过程关键工序为上台阶开挖,侧导坑开挖对围岩稳定性有较大影响,隧道采用中导洞台阶法直接开挖仍可以保障围岩稳定性,同类工程采用中导洞台阶法开挖是安全可行的。
In order to further study the mechanical behavior of the surrounding rock during the construction of the bifurcated tunnel, taking a bifurcated tunnel under construction as an engineering background, the numerical simulation of the tunnel construction process is carried out by FLAC3D finite difference software. The stress and displacement distribution and variation of the surrounding rock and the middle partition of the arch are analyzed. Based on this, the tunnel construction plan is optimized and analyzed. The results show that: the key process of the tunnel excavation process is the excavation of the upper steps, the excavation of the side guide pit has a great influence on the stability of the surrounding rock. The direct excavation of the tunnel using the pilot tunnel method can still guarantee the stability of the surrounding rock, Similar projects using the pilot tunnel excavation step is safe and feasible.