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针对现有岩石损伤模型的局限性与不足,将应力作用下的岩石抽象为空隙、损伤与未损伤材料三部分,以空隙率反映岩石体积或空隙的变化,以损伤变量或损伤因子反映岩石力学性态的改变程度,通过对各部分材料的微观受力及其与宏观应力和应变的关系进行分析,建立了可反映岩石变形过程中体积或空隙变化特性的新型岩石损伤模型;从岩石微元强度合理度量方法研究入手,引进统计损伤理论,建立了可考虑损伤阀值影响的岩石统计损伤演化模型,进而建立了能模拟应变软硬化全过程的岩石统计损伤本构模型,并提出了参数确定方法。该模型不仅能反映岩石应变软硬化特性,而且能反映岩石变形的初期压密和后期扩容的特性。通过实例分析与讨论,表明模型合理与可行。
Aimed at the limitations and shortcomings of existing rock damage models, the rock under stress is abstracted into three parts of voids, damaged and undamaged materials. The voidage reflects the change of rock volume or void, and the damage variable or damage factor reflects rock mechanics By analyzing the microscopic forces of various materials and their relationship with macro-stress and strain, a new type of rock damage model that can reflect the change of volume or void in rock deformation process is established. Based on the statistical damage theory, a statistical damage evolution model considering the influence of damage threshold is established, and then a statistical damage constitutive model of the rock that can simulate the whole process of strain softening and hardening is established, and the parameter Determine the method. The model can not only reflect the characteristics of rock strain softening and hardening, but also reflect the characteristics of initial deformation and post-expansion of rock deformation. Through case analysis and discussion, it shows that the model is reasonable and feasible.