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基于能反映岩石破坏后仍具有残余强度特征的新型损伤模型,引进统计损伤理论,考虑损伤阈值的影响,分别采用Lade-Duncan准则和Drucker-Prager准则对岩石微元强度进行合理度量,建立岩石统计损伤本构模型。理论曲线与试验曲线的对比分析表明了所建模型的合理性。针对基于Drucker-Prager准则建立的岩石统计损伤本构模型不能有效反映损伤阈值,通过对岩石损伤演化规律的分析,对该模型进行了修正。最后通过对两种模型的对比分析,确定了模型的合理应用范围。
Based on the new damage model which can reflect the characteristics of residual strength after rock failure, the statistical damage theory is introduced and the influence of damage threshold is considered. Lade-Duncan criterion and Drucker-Prager criterion are respectively used to measure the strength of rock micro-elements and establish rock statistics Damage constitutive model The comparison between the theoretical curve and the experimental curve shows the rationality of the model. According to the statistical damage constitutive model established based on the Drucker-Prager criterion, the damage threshold can not be effectively reflected. Based on the analysis of the damage evolution of rock, the model is modified. Finally, through the comparative analysis of the two models, the reasonable application range of the model is confirmed.