Study on the Damage Process and Numerical Simulation of Tunnel Excavation in Water-Rich Soft Rock

The weakening effect is one of the most important causes triggering large deformation and failure soft-rock engineering; however, few studies paid attention to damage evolution constitutive relationship rock in tensile excavation unloading water-weakening process, not mention coupling process water-weakening. In this paper, mechanism engineering characteristics softening water-softening water-rich soft are analyzed summarized. Then with aid strain equivalent principle, surrounding caused by coupled, compression shear under analyzed. A model subjected proposed considering influence water immersion time, applied a newly established finite element simulation method, which suitable for rock. Based on mechanical-hydraulic-damage coupled progressive dual effects can be reflected deteriorated parameters elements. Finally, field monitoring data typical section Xujiadi tunnel used verify applicability accuracy method.