The Compressive Creep Parameters Inversion Method Of Complicated Rockmass And Its Application

Along with the implementation of great western development strategy, in the next few decades our country will plan and establish many large-scale water conservancy and hydropower projects in the west. After completing, the stability of structures is especially important, and dam slope stability caused by rock creep is the key issue, so rock mass creep property if of great significance to the stability of rock projects. It is a vital problem to be solved how to properly identify compressive creep parameters of rock mass according to the compressive creep test data.Taking the diabase and compresso-crushed zone of Dagangshan Hydropower Dam zone as engineering application background, and integrating the analytic inverse analyzing and intelligent inverse analyzing method, this paper proposes analytic-intelligent displacement inverse analyzing method, which can successfully solve the inverse problem of the complex rockmass compressive creep parameters and help study long-term stability of the both sides slope after engineering completion. Respectively, some aspects are studies as follows:(1) In view of the compressive creep test of rigid bearing plate, the creep deformation formula of surface rockmass under rigid bearing plate is deduced. According to the viscoelastic theory, the semi-infinite elastomer viscoelastic analytical expression under bearing plate load tests is summarized and generalized, which establish analytic inverse analyzing method of rockmass compressive creep parameters.(2) The compressive creep parameters are preliminarily inversed by analytic inverse method, and the analytic inverse result can be obtained.(3) Combining the analytic inverse method and the intelligent inverse method, the analytic-intelligent displacement inverse analyzing method can be established.(4) Applying the analytic-intelligent inverse analyzing method in rockmass creep parameter inversion, the creep parameter analytic-intelligent may be acquired, which may be compared with analytic inverse result, and analytic-intelligent inverse method will be proven rational and accurate.(5) The 3D geomechanical model of Dagangshan Hydropower Dam zone can be established by FLAC^3D. Applying the creep parameters of the diabase and compresso-crushed zone into excavation-impounding calculation, the long-term stability of both sides slope will be studied.