Stability analysis of surrounding rock-supporting system of shallow buried soft rock tunnel based on time effect

Abstract

In view of the lack of consideration of the time effect parameters of surrounding rock and supporting structure in the past research, this paper aims at the surrounding rock deformation characteristics of highway soft rock tunnel, and by introducing the long-term strength of rock and the creep coefficient of sprayed concrete, the surrounding rock and concrete mechanical parameters considering time effect is obtained. This paper uses ANSYS software to establish the finite element model, according to the application of anchors, steel arches and shotcrete support after the excavation without any support and excavation. The simulation results of surrounding rock-support stability after tunnel excavation are obtained. The effects of surrounding rock mechanical parameters and supporting parameters on tunnel deformation and surrounding rock stability under different time effects are studied. The research results can provide useful theoretical suggestions for the safe construction of subsequent soft rock tunnels.