Numerical research on anti‐dislocation measures design of deep‐buried tunnels in an anisotropic rock mass area

Abstract

This research studies the deformation characteristics and plastic zone distribution of a deep‐buried tunnel under fault dislocation through numerical simulation. The Columnar–Basalt constitutive model is utilized to describe the anisotropic characteristics of the surrounding rock mass. The conventional design and the articulated design are compared to demonstrate the superiority of the articulated design in controlling deformation and plastic zone distribution. The results show that the articulated joint can share the pressure on the lining, and the deformation value borne by the tunnel lining itself is relatively small. The articulated design not only weakens the influence of stress concentration but also adjusts the stress state. Based on the simulation results with anisotropic characteristics, the change in joint angles causes the deformation of the surrounding rock to show a preferred direction. The failure mode of the surrounding rock is mainly dominated by joint shear failure and rock matrix shear failure. This study provides an articulated design strategy of anti‐dislocation for a deep‐buried tunnel in an anisotropic rock mass area.