| Abstract: | As the depth of exploitation increases, studies on constitutive models of rock affected by temperature and humidity become very important. Based on the Nishihara model, a visco-elastic-plastic rock model was established by using the coefficients of thermal and humidity expansion, thermal viscosity attenuation, humid viscosity attenuation and acceleration rheology components. We used the definition of a controlled heat circle to explain the model. The results show that the behavior of rock, affected by temperature and humidity, is stable as a function of time when the stress is lower than the first yield stress σS1;the creep rate will increase due to the effect of temperature and humidity when the stress is greater than or equal to σS1;the creep rate will accelerate at an increasing rate when the stress is greater than or equal to the second yield stress σS2,which results in a failure of the roadway. The model derived in this study can completely describe visco-elastic-plastic characteristics and reflects the three stages of rock creep. |
