偏压状态下非对称连拱隧道有限元分析

Finite Element Analysis on Asymmetrical Multi-arch Tunnel under Bias Condition

摘要:

非对称连拱隧道是一种特殊隧道，具有几何不对称、结构不对称等复杂的力学特征。而非对衬连拱隧道的修筑不可避免要穿越偏压地形，偏压地形又会对隧道的受力状态产生较大的影响。采用有限元单元法对偏压地形条件下非对称连拱隧道进行数值模拟分析，根据大洞径隧洞和小洞径隧洞的左右位置不同的情况下围岩及衬砌结构受力变形特点，得出在偏压状态下非对称连拱隧道中的小隧道应设计在埋深大一侧的结论，为隧道的设计提供了一定的理论依据。 关键词：非对称隧道；偏压状态；连拱隧道；数值模拟

Abstract:

Asymmetrical multi-arch tunnel is a special kind of tunnel, which has complicated mechanical characteristics of geometric asymmetry and structural asymmetry. In the asymmetrical multi-arch tunnel construction, it is inevitable to pass through the bias terrain, and the bias has great impact on the stress state of the tunnel. The finite element method is used to make numerical simulation analysis on the asymmetrical multi arch tunnel under bias terrain condition. According to the forced deformation characteristics of surrounding rocks and lining structures of the tunnels with large and small diameters in the left or right, it is concluded that the small one of the asymmetric twin-arch tunnel should be designed at the deeply-lying side in the biased state, which provides a theoretical basis for the design of the tunnel.