摘要
岩质隧道的施工过程是典型的卸载力学过程。由于岩体在加载和卸载条件下应力路径的不同,仅采用加载条件下所建立的力学模型来研究隧道的开挖稳定性问题是不适合的。笔者从隧道围岩的力学性能及破坏机理出发,引入损伤力学理论,建立三维非线性脆弹塑性损伤有限元模型,研究在加、卸载条件作用下隧道施工全过程的围岩稳定性,为实际工程提供理论指导作用。
Construction process of rock tunnels is a typical unloading mechanical process. Due to the difference in stress paths between the loading and unloading conditions, it is unsuitable to apply mechanical model under loading condition to stability of tunnel excavation. Based on mechanical behavior of surrounding rock and its failure mechanism, introducing the theory of damage mechanics, this paper establishes a 3D nonlinear elastoplastic damage FEM model under unloading conditions, which is used to study the stability of surrounding rock during excavating tunnel under combined effect of loading and unloading actions so as to provide directions for practical engineering problems.
出处
《红水河》
2005年第3期53-56,68,共5页
Hongshui River
关键词
岩质隧道
开挖稳定性
卸载条件
损伤力学
脆弹塑性
有限元分析
rock tunnel
stability of excavation
unloading condition
damage mechanics
elastoplasticity
finite element analysis
