兰州南山伏龙坪双层隧道施工方案比选与研究

Comparison and Study of Construction Methods Of Fu Longping Double-decked Tunnel In Nanshan of Lanzhou

采用二维弹塑性有限元法,分析了在两种施工方案下伏龙坪双层隧道各个施工阶段围岩和衬砌的受力状态,考虑材料的非线性特征,采用Mohr-Coulomb屈服准则及其关联流动法则,采用切线刚度迭代法求解平衡方程,对超过屈服点的应力进行应力调整.

This paper analyzes the forced state of surrounding rock and tunnel lining in every step of the construction project for Fu longping double - decked tunnel. In the analysis, considering the elastic - plastic characteristic of the material, Mohr- Coulomb＇s yield criterion is employed in coporating associated flow law . The tangent stiffness method is adopted to solve the equation of equilibrium, and the stresses which exceeded yielded point are adjusted.