非线性M—C准则下的大断面坦三心圆隧道塌方的上限分析

塌方是隧道施工过程中的重大安全事故,不仅造成施工中断、工期延误,还可能导致施工机械的损坏,严重者造成安全事故,给现场施工造成巨大损失。所以,为了保证隧道工程现场的施工安全,以免造成生命财产损失,对隧道施工过程中塌方现象进行研究和分析具有重要的经济意义和安全意义。采用极限分析上限理论,基于非线性Mohr-Coulomb破坏准则,对坦三心圆深埋隧道的塌落机制进行理论计算,对隧道的各参数对塌方的影响进行分析,为实际工程的设计和施工提供参考。

Research on Collapseof Three-centred Arch Cross-section Tunnel by Upper Bound Analysis under Mohr-Coulomb Criterion

Landslide is a major safety accident in the process of tunnel construction. It not only leads to the suspension of construction delays, may also cause the damage of construction machinery, serious cause safety accidents and caused huge losses to the site construction In order to avoid the occur- rence of collapse and ensure the safety of tunnel construction, the research, centering on tunnel collapse mechanisms and pre-warning technology, is of great significance. The onlinear Mohr-Coulomb failure criteria and limit analysis theory was used in this paper to analyze the collapse in smooth three-centred arch tunnel. The influence of various parameters on the tunnel is analyzedand it provides reference for engineering construction.