In the course of study on surrounding creep character of large and long water transfer tunnel at Jingping Ⅱ hydropower,a series of shear creep laboratory work for two months on marble at Jingping Ⅱ hydropower was carried out.Using the viscous-elastic constitutive model of FLAC~(3D) software(Cvisc constitutive mode) and analyzing simulation results,after excavation of tunnel,rapid changing deformation and stress of tunnel,the surrounding rock of tunnel reaches a steady-state value sustaining 50 days and cros...