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隧道围岩变形关系到隧道的安全,因此使用变形位移为判据分析软岩隧道稳定性具有重要意义。新安岭软岩隧道地质情况复杂,本文结合围岩的物理力学参数应用理论分析得出隧道围岩变形的理论极限位移,通过MAIDAS有限元数值模拟软件建立相应的计算模型,分析了现场施工引起的隧道围岩变形位移,通过现场监测验证了数值计算的可靠性,得出围岩的变形规律,依据位移评判分析隧道的稳定性。结果表明,采用有限元分析新安岭软岩隧道变形小于极限位移,支护合理,整体稳定。
The deformation of tunnel surrounding rock is related to the tunnel safety. Therefore, it is of great importance to analyze the stability of soft rock tunnel by using the displacement of displacement as criterion. The Xinanling soft rock tunnel has complex geological conditions. Based on the physical and mechanical parameters of the surrounding rock, the theoretical limit displacement of the tunnel surrounding rock deformation is obtained by theoretical analysis. The corresponding calculation model is established by MAIDAS finite element numerical simulation software, Deformation and displacement of surrounding rock of the tunnel are verified by on-site monitoring. The reliability of numerical calculation is verified and the deformation law of surrounding rock is obtained. The stability of the tunnel is analyzed based on the displacement evaluation. The results show that the deformation of Xinanling soft rock tunnel is less than the limit displacement by finite element analysis, and the support is reasonable and the whole is stable.