静载荷与循环冲击作用下岩石损伤变量定义方法的选择

摘要

Selecting a suitable physical and mechanics parameter to define damage variable of rock is of great sig-nificance to describe damage cumulative evolution characteristics of rock subjected to coupled static loadings and cyclic impacts. Based on the test results and definition methods of damage variation of rock or concrete under static loads, the parameters of defining damage variable were selected from whether they can reflect the evolution process of rock dynamic fatigue mechanics characteristics and the damage caused by the first impact and the final reasonable damage. The results show that residual strain and wave impedance may be used to define the damage variable of rock subjected to coupled static-cyclic impact loadings. Compared with wave impedance to define damage variable, it seemed that subjective factors have greater effect on residual strain for defining rock damage variable.%选择合理参数定义损伤变量，对研究静载荷与循环冲击组合下岩石的损伤演化特性具有重要的意义。基于动静组合加载实验装置，对岩石开展静载荷与循环冲击组合加载试验，根据试验结果并依据现有定义静载荷作用下岩石或混凝土损伤变量的方法，从能否表征岩石动态疲劳力学性能的演化规律、第1次冲击造成的损伤以及最终的合理损伤等3个角度，对定义岩石损伤变量的参数进行选择研究。结果表明，残余应变和波阻抗可以定义静载荷与循环冲击组合作用下岩石的损伤变量；与波阻抗相比，残余应变计算损伤变量受主观因素影响较大。