基于D-P准则千枚岩变形破坏统计损伤本构模型研究

在分析岩石变形机理基础上，选用Drucker-Prager准则和推广的Lemaitre应变等价性原理，在统计损伤变形理论基础上考虑岩石初始损伤阈值，建立能表达绢云母千枚岩变形破坏全过程的统计损伤本构模型，对岩石三轴围压条件下应力-应变曲线进行拟合。引入损伤修正参数q对完全破坏阶段的变形过程进行修正，利用公式法代替传统比较法所得到的参数；修正后模型能更好地反映绢云母千枚岩处于完全破坏阶段变形特征，常规物理力学试验即可得到相应模型参数。探讨不同围压下分布参数对本构模型影响，验证该模型的准确性和可行性。

Study on Statistical Damage Constitutive Model of Phyllite Deformation and Failure Based on D-P Criterion

On the basis of the analysis of rock deformation mechanism, the Drucker-Prager criterion and the Lemaitre strain equivalence principle are selected. The initial damage threshold of the rock is considered based on the statistical damage deformation theory. A statistical damage constitutive model for the whole process of deformation and failure of sericite phyllite was established. The stress-strain curves of rock under triaxial confining pressure were fitted. The damage correction parameters q is introduced to correct the deformation process in the stage of complete failure, and the formula method is used to replace the parameters obtained by the traditional comparison method. The modified model can better reflect the deformation characteristics of sericite in the stage of complete failure, and the corresponding model parameters can be obtained by conventional physical and mechanical tests. The influence of distribution parameters under different confining pressures on the constitutive model is discussed, and the accuracy and feasibility of the model are verified.