Abstract:Once deep-buried long tunnel is constructed in soft rock under high crustal stress,rheology of soft rock is an outstanding engineering geology problem. When Wuqiaoling tunnel,located in Lanzhou—Xinjiang railway line,crosses active fracture zone F7 with width of 785 m,significant rheology occurs in weak wall rock. Maximum displacement of wall rock exceeds 1m. Rheology results in severe damage to supporting structure of tunnel. Based on long-term monitoring convergence deformation of Wuqiaoling deep-buried long tunnel,this paper analyzes convergence deformation regularity of two parallel main tunnels. Results show the left main tunnel¢s convergence obviously exceeds that of the right,because the right main tunnel¢s construction absorbs the experience of the left main tunnel. Furthermore,authors research on rheology rule of Wuqiaoling tunnel by FLAC3D. Numerical analysis result basically is consistent with actual measurement result. Finally,6 principles to dispose soft wall rock rheology are presented.