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通过砂岩试件疲劳破坏的声发射实验,分析了砂岩疲劳破坏过程的声发射特性,研究了岩石的疲劳损伤演化规律.按岩石整个疲劳过程的声发射特征及损伤演化规律,并参考岩石不可逆变形发展的三阶段规律可以将其分为四个阶段.岩石疲劳损伤破坏具有突发性,在岩石失稳阶段损伤加速演化.如果以声发射监测和预测岩石疲劳破坏,在损伤量0.4左右即进入失稳阶段,在损伤量0.3左右即进入失效阶段.
Through the acoustic emission experiment of sandstone specimen fatigue failure, the acoustic emission characteristics of the sandstone under fatigue failure were analyzed and the evolution law of fatigue damage of rock was studied. According to the characteristics of acoustic emission and damage evolution of the whole rock fatigue process and with reference to the irreversible deformation of rock The three stages of development can be divided into four stages: the fatigue damage of rock is abrupt, and the damage accelerates and evolves during the rock instability stage.If acoustic emission is used to monitor and predict the fatigue failure of rock, the damage amount is about 0.4 Instability stage, the damage amount of about 0.3 into the failure stage.