超大断面隧道围岩的稳定性分析

根据地下结构设计理论和岩石屈服的Dmcker—Prager准则，考虑到围岩的自身承载能力，采用有限元对广西柳州一处公路隧道围岩的稳定性进行了分析。考虑到开挖方式、开挖顺序对围岩稳定性的影响，对围岩的开挖过程进行模拟。确定不同开挖方式下隧道围岩的位移、应力状态，以及位移、应力状态随时间的变化规律，为隧道施工过程中开挖方案的制定、支护时间的选取提供了依据。

FEM Analysis of Rock Stability on Super Section Tunnel

Based on theory of structure design and guide line of Drucker-Prager for rock. taking into account of its capability bearing the weight of surrounding rock, the Guangxi Liuzhou City road tunnel has been analysed to simulate the surrounding rock by FEM analysis. Considering the effect of the excavated means and the excavated order to the stability of the surrounding rock, the process of excavation of the surrounding rock is simulated.Making certain surrounding rock of tunnel bit shift, stress condition on the different excavation means, and the alternation regular pattern with bit shift and stress adapts to time. It offered a foundation for excavation scheme formulation and selection supporting time in the process of building the tunnel.