The Study Of Rock Rheological Properties And Deformation Of Surrounding Rock Under High Temperature Of Hydropower Station Tunnel

In geotechnical engineering, there have been some cases which were the high temperature and high pressure.Under the condition of high temperature and high pressure,even some hard rock also show significant rheological properties. Therefore, it is of great theoretical significance and engineering value to describe and reveal the mechanical properties and behaviors related to rock and time, and to understand their significant rheological behavior and damage characteristics.The tall Qireha hydropower station project as the background, aiming at the limitation of engineering rock mass deformation behavior and the long term strength,this paper carried out the rheological characteristics of indoor triaxial compression rheological experiments under the condition of different temperature respectively under the same confining pressure and different confining pressure. Constitutive model and parameters inversion are discussed based on the rheological test results of rock rheological and theological analysis of engineering rock mass is carried out. The main research work and main achievements as follows:(1) Using Qireha hydropower Station Diversion Tunnel gneissic granite as the research object, do rock rheological test,according to the indoor rock rheological test of three axial compression, and under different temperature conditions and respectively under the same confining pressure and different confining pressures by RLW-1000G rock specimen automatic three axis servo rheometer, so research the rock and law of rheological properties.Based on the characteristics of rheological and the characteristics of the law of the gneissic granite sample in indoor test,choosing element combination model as the rheological model of rock(visco-elastoplastic model) which can describe the main creep of rock properties simply and intuitively,and fitting out parameters of the rock rheological model (visco-elastoplastic model)which is based on rock rheological test data,and the fitting result is accordance with the test data.(2) Based on the results of indoor gneissic granite rheological test, the rheological long-term strength were studied under the condition of different temperature respectively under the same confining pressure and different confining pressure. This paper uses stress-strain curves of the cluster method, which is the most popular at present, to calculate the rock rheological long-term strength. At the same time, using the 1 Stopt software and the software of origin to identify the rheological model of the test so that visco-elastoplastic model which is selected by the test is verified. Finally, the parameters and temperature of the gneissic granite rheological test model on door were discussed.(3) The gneissic granite numerical simulation of tall Qireha Hydropower Station Diversion Tunnel is provided by the large-scale general finite element analysis software ABAQUS, which can make the researcher get more intuitive understanding of confining pressure creep deformation and provide theoretical basis for the engineering practice.