FEM Analysis of time-dependent behavior and failure process of deep shaft

Hashiba, Kimihiro; Sato, Toshinori  

Time-dependent behavior and failure process of deep vertical shaft was simulated with the aid of non-linear theological constitutive equation of rock. This simulation focused on the effect of gravity and the deformation behavior parallel to the direction of excavation, which has hardly been examined with horizontal roadway or tunnel. Simulation with the model of 1000 m deep vertical shaft was carried out, and the effect of rock properties and rock stress conditions was examined. It was found that time-dependency, ductility, Poisson's ratio of rock mass and the ratio between horizontal and vertical rock stresses had an effect on failure process around the bottom of vertical shaft.