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声速变化是表征损伤变量的有效参数。为揭示岩体爆破累积损伤效应及损伤演化规律,在某地下工程中开展了反复爆破作用下围岩损伤的声波测试,并对测试数据进行了回归分析。在此基础上,分析了多次爆破作用下岩体损伤与声速变化的对应关系,建立了以岩体声速降低率为基准量的岩体爆破累积损伤扩展模型。研究表明:(1)回归分析的相关系数大于0.9816,说明岩体爆破损伤非线性累积回归预测模型是正确的;(2)岩体爆破累积损伤模型将岩体损伤总量定义为初始损伤和爆破损伤之和,综合考虑了爆破损伤累积效应和岩体初始损伤的影响,能够真实反映岩体损伤程度,是合理可行的。
Velocity variation is a valid parameter for characterizing damage variables. To reveal the cumulative damage effect and damage evolution of rock mass blasting, an acoustic test of surrounding rock damage caused by repeated blasting was carried out in an underground project. The regression analysis of the test data was carried out. On this basis, the corresponding relationship between the damage of rock mass and the variation of sound velocity under multiple blasting is analyzed, and the cumulative damage expansion model of rock mass based on the sound velocity reduction of rock mass is established. The results show that: (1) the correlation coefficient of regression analysis is greater than 0.9816, which shows that the non-linear cumulative regression prediction model of rock blasting damage is correct; (2) The cumulative damage model of rock mass defines the total damage of rock mass as initial damage and blasting The sum of the damage, considering the cumulative effect of blasting damage and the initial damage of the rock mass, is a reasonable and feasible way to reflect the damage degree of the rock mass.