Numerical Simulation of Non-Stationary Parameter Creep Large Deformation Mechanism of Deep Soft Rock Tunnel

The accelerated creep plays an important role in the disasters of soft-rock tunnels under high stress. However, most previous studies only involved attenuation and uniform creep. Large deformation soft rock occurred during tunneling process Qianzhou–Sanyangchuan Tunnel, Gusu Province, China. In paper, we developed nonlinear generalized Nishihara rheological model with non-stationary parameter (NGNRM) to simulate behaviors rocks stress, implemented it ABAQUS, reveal mechanism large rock. We proposed multi-objective back analysis method surrounding mechanical parameters based on eXtreme Gradient Boosting non-dominated sorting genetic algorithm-II. addition, orthogonal test design was used determine main affecting displacement tunnel. Using method, can evaluate deep tunnels, scientifically when reinforce prevent a disaster