Research on Deformation and Loose Zone Characteristics of Large Cross Section Tunnel in High Geo-Stress Soft Rock

In constructing high-geo-stress soft rock tunnels, the major deformation disaster of surrounding has always been main problem faced during construction. The research on and loose zone characteristics large tunnels positive significance for safe rapid construction tunnels. Therefore, based Yuntunpu tunnel, this article first analyzes geological tunnel site area in response to deformation. Subsequently, on-site testing analysis were conducted four sections. Finally, comprehensive characteristics, causes are analyzed. results indicate that Tunnel mainly manifested as a initial rate rock, short self-stabilization time cumulative amount, long duration. is influenced by grade structure with loosening ranging from 12 14 m, wave velocity variation exhibited different grades vary greatly. Adopting collaborative active control anchor rods recommended limit continued development zones rocks. affected high geo-stress, formation lithology, structure, engineering disturbance, groundwater. Among them, geo-stress lithology decisive important factors occurrence disasters tunnel.