基于影响因子修正的岩石损伤力学模型探讨

针对现有岩石损伤模型的局限性与不足，在深入探讨岩石变形损伤机制的基础上考虑岩石损伤的过程，提出损伤部分可分为损伤材料和因材料损伤而变化的微缺陷。在该基础上提出新的损伤定义，还提出了损伤材料与因材料损伤而变化的微缺陷之间的影响因子?，同时提出其参数确定方法，研究其基本性质。通过岩石微观受力分析，建立了岩石损伤模型。通过深入研究岩石有效应力与名义应力的关系，并引进统计损伤理论，建立岩石损伤统计本构模型。该模型能够充分地反映岩石的应变软化特性和应变硬化特性，且参数物理意义明确，应用将较为方便。最后，与实测结果及前人成果的比较分析，验证了该模型的合理性、可行性。

Discussion on rock damage mechanical model based on impact factor modification

Considering the insufficiency of the present theory of rock damage model, this paper presents that the rock damage can be divided as damage materials and the rock microdefects caused by the materials damage on the basis of the study of the mechanism of rock deformation and the process of rock damage. Then a new definition of rock damage and impact factor γ between the damage materials and the microdefects is presented. Meanwhile, ascertain parameters, the basic properties of γ, and a rock damage model is established according to micro rock force analysis. Furthermore, a statistical constitutive model is established by introducing the statistical damage theory and lucubrating the relationship between effective stress and normal stress. The model well reflected the strain- softening characteristics of rock and strain- hardening of rock and had the definite physics meaning parameters. Therefore, it is easy to be applied. Finally, the model is proved to be rational and feasible by comparing with the existing research results and measured data.