Effect of Temperature on Crack Propagation Law of Deep Fractured Sandstone
In order to study the mechanical properties and crack propagation law of fractured sandstone under different temperature conditions,biaxial compression tests were carried out on fractured sandstone treated at different temperatures(-20 ℃,20 ℃,40 ℃).PFC2D was used to simulate the biaxial compression tests of fractured sandstone at different temperatures.The variation of parameters such as crack evolution,failure mode,propagation rate and propagation morphology of fractured sandstone after temperature action was analyzed.The results show that temperature has a significant effect on the crack propagation rate and morphology of fractured sandstone.The crack propagation rate is faster under high temperature conditions,and the crack morphology is symmetrical"L"shape,and the number of cracks increases.Under the condition of low temperature,the crack propagation rate slows down,and the crack morphology presents symmetrical parallel straight line shape.In addition,temperature also affects the friction and adhesion among particles,thus affecting crack propagation.By comparing the temperature-stress coupling numerical model with the experimental results,it can be seen that the similarity between the two is as high as 90％,which can better verify the crack propagation law of fractured sandstone.The research work can provide new ideas and methods for technological innovation in the field of rock mechanics.
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