Creep Mechanical Properties And Theoretical Analysis Research To Gneissic Granite With Considering The Effects Of Temperature

With the development of economy and science technology progress, engineering construction has deep into underground. The external environment is quite different from deep rock-mass than the surface and shallow rock mass, in which a combination of temperature and stress will bring difficulty for engineering design and construction, and still bring great security hidden danger to the stability of the project for a long time operation. In this paper, based on Qirehataer hydropower station, the gneissic granite as the research object, using creep test and theory research as study methods, obtained rock creep mechanics characteristics under temperature influence. On this basis, The T-VEP creep model is established, inversion of creep parameters are obtained, and verify the reliability of the model, analyzed the influence law of temperature creep property of rock under different stress state. Research results can provide the basis for the engineering stability analysis.The paper main research results include the following aspects:A、The different temperature to gneissic granite triaxial creep test has been carried on. Analyses the temperature under the influence of rock creep deformation and volume strain, creep rate and the changing rule of the long-term strength, revealed the temperature under the influence of rock creep failure mode.B、T-VEP creep model which considering the temperature and damage effects is brought forward, Stress strain constitutive relation has been established, inferred to creep equation of one dimensional and three dimensional. Preliminary analysis shows that the model can reflect creep reduction, constant speed, speed up three stages. And it can well simulate hemp shaped granite creep characteristics.C、According to the T-VEP creep model,least squares algorithm was optimized by using nonlinear test results for the parameter inversion, creep parameter are successful obtained, verify the reliability of the model.D、According to the T-VEP creep model, analysis of the typical low, medium and high stress state under the influence law of temperature on the creep characteristics, The results show that high temperature and high stress on deformation, creep rate and creep volume, had significant effect on the volume deformation.