隧道围岩稳定性的有限元分析

Finite Element Analyses of Tunnel Wall Rock Stability

摘要:

根据地下结构设计理论和岩石屈服的Drucker-Prager准则，考虑到了围岩的自身承载能力，采用有限元的分析方法对广西柳州一处公路隧道围岩的稳定性进行了分析。分析了开挖方式、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依据。

Abstract:

Following the theory of underground structure design and Drucker-Prager standard for rock yield,the wall rock stability of a highway tunnel in Guangxi was analyzed by finite element method, taking self bearing capacity of wall rock into account. The effects of excavation methods and sequences on wall rock stability were analyzed. The wall rock excavation process was simulated. The displacement, stress condition, and the change pattern of displacement and stress in time were determined, providing the foundation for selection of excavation methods and supporting time in tunnel construction.