Numerical Simulation Method for Tunnel Excavation Considering Mechanical Characteristic Variation of Soft Rock with the Confining Pressure Influence

The accurate prediction and evaluation of stress displacement fields surrounding rock is the fundamental premise for deformation control soft tunnels under high geo-stress condition. However, due to complicated mechanical characteristics with confining pressure influence, current numerical simulation method usually regards parameters as constant ignores variation these in process, which leads results that cannot accurately reflect behavior rock. Therefore, this paper firstly investigates effect on strength proposes corresponding variable models influence. Secondly, a transversal loop discriminant update procedure proposed introduced into iteration calculation process FLAC3D, thus forming an improved method. This can integrally consider parameter realize automatic such its state. Finally, application example, expression longitudinal profile (LDP) considering influence based numerous tunnel obtained by