Article ID Journal Published Year Pages File Type
294713 Mining Science and Technology (China) 2010 5 Pages PDF
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.

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