大跨度公路隧道动态施工围岩稳定性数值分析

Numerical Analysis of the Stability for the Surrounding Rock During Dynamic Construction Process of Large-span Tunnel

结合龙头山隧道工程,利用有限元软件ADINA建立空间计算模型,用三维弹塑性有限单元法对隧道Ⅲ类围岩段施工过程围岩稳定性和安全性进行分析,分析施工过程中围岩的位移、应力、应变变化规律,得出了一些有益的结论,对大跨度隧道施工过程中的围岩稳定性和安全性评价有一定指导意义。

Associated with the project of Longtoushan tunnels, in this paper, by use of ADINA, a nonlinear FEM program, a spatial computation model is made, a numerical computation method with 3 - D elastic - plastic finite element is proposed to analyze stability and safety of the Ⅲ surrounding rock in construction,through analyzing the distributing law of displacement, stress and strain in rock mass followed with tunnel＇s construction, the author gets some beneficial conclusions,which is of guiding meaning for evaluation of stability and security in surrounding rock during construction of large - span highway tunnels.