Abstract:By connecting the nonlinear viscoplastic body(NVPB) model put forward by the authors and five-component viscoplastic model in series,a new seven-component nonlinear viscoelasto-plastic rheological model of rock(Hohai model) is proposed,which can reflect fully the accelerative rheological property of rock material. The rheological equations of rock at the constant stress and strain are deduced. The nonlinear creep property and relaxation property of rock are carried out based on the theoretical analysis and investigation. At the same time,on the basis of complete creep curves gained by using rock servo-controlling rheology equipment,the identification of the proposed seven-component nonlinear viscoelasto-plastic rheological model of rock is validated. The comparison between nonlinear rheological model and experimental curve shows that the proposed nonlinear viscoelasto-plastic rheological model is available and reasonable. Based on the proposed seven-component nonlinear viscoelasto-plastic rheological model of rock,the central difference equation in three-dimensional condition of this nonlinear rheological model is deduced. By adopting the secondary development routine interface of software—fast Lagrangian analysis of continua (FLAC3D),the numerical analysis code of nonlinear rheological model is investigated and developed. Through a uniaxial compression numerical example,the correctness and rationality of the proposed nonlinear rheological model is validated further. In the end,by adopting the developed nonlinear rheological numerical code,the three-dimensional simulation is conducted for the dam foundation of Jinping First Stage Hydropower Station,and the analysis results bring forward reasonable suggestion and evaluation for the long-term stability and safety of dam foundation of Jinping First Stage Hydropower Station.