Abstract：The shear rheology experiment on the shear rheology equipment is carried out for unfilled jointed rock specimens in the surrounding rock mass of a huge underground cave in Longtan hydropower station. The long-term shear strength parameters of jointed rock are gained. Compared with the short-term shear strength parameters gotten by rapid shear experiment，the long-term shear strength parameters have some reduction. What’s more，the sensitivity of cohesion on time is higher than that of internal friction angle. Based on the shear rheological curves of joint rock obtained on rock shear rheology equipment，five-component viscoelastic shear rheology model is used to identify the curves that show the viscoelastic rheological properties，and the viscoelastic shear rheological parameters of jointed rock are obtained. Then by connecting nonlinear viscoplastic body(NVPB) put forward by the author and five-component viscoelastic shear rheology model in series，a seven-component nonlinear visco-elastoplastic shear rheology model of rock is constructed. Then by using complete accelerative shear rheological curve of joint rock，the identification of the proposed seven-component nonlinear visco-elastoplastic shear rheology model of rock is carried out. The correlative parameters of nonlinear shear rheology model such as viscoelastic shear modulus and viscosity，etc.. are also gained. The comparison between the shear rheology model and experimental result shows that the proposed non-linear shear rheology model is right and reasonable.
