Research on Influence and Control of Unified Strength Theory of Geotechnical Materials on Deformation of Operating Metro Tunnels

Abstract

The difficulty in controlling large deformation of subway tunnels has always been a difficulty during construction and later operation, especially after the tunnel is excavated, a loose circle is formed around the tunnel. If the initial support strength of the tunnel cannot effectively resist the deformation of surrounding rocks, then Subway tunnels will continue to deform after excavation. If this kind of continuous deformation cannot be effectively controlled, the deformation of the tunnel will exceed the original designed deformation, and the large deformation of the tunnel will bring huge hidden dangers to the operation of the subway. The initial support technology is essential to quickly and effectively suppress the continuous deformation of the tunnel. Based on the unified strength theory, this paper studies the deformation mechanism and laws of the tunnel, and discusses several feasible control methods.