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采用离散元法(DEM)对胶结岩土材料本构模型中的破损规律进行验证。首先,根据胶结颗粒间胶结特性,建立适用于胶结颗粒的微观理论;其次,基于该微观理论,给出3种经典胶结岩土材料本构模型破损参数的微观解释;最后,对数值试样进行等向压缩、等应力比压缩及双轴压缩试验的离散元数值模拟,并对比验证数值试样破损规律的模拟结果与本构模型的预测结果。结果表明:采用DEM对胶结岩土材料本构模型的破损规律进行验证是可行的。3种加载条件下,扰动状态模型假定的破损规律同模拟结果均较为一致;Nova模型在双轴压缩试验条件下的预测结果同模拟结果存在很大差异;而上负荷面剑桥模型假设的破损参数则不能很好描述上述加载条件下数值试样的破损规律。
Discrete element method (DEM) was used to verify the damage rules in the constitutive model of cemented geomaterials. First of all, based on the cementation characteristics of cement particles, the microscopic theory of cement particles is established. Secondly, based on the microscopic theory, the microscopic interpretation of the damage parameters of the three kinds of constitutive model of cemented geomaterials is given. Finally, Isotropic compression, isostatic compressive compression and biaxial compression tests were carried out. The numerical simulation results of the damage of numerical specimens and the predictions of the constitutive model were compared. The results show that it is feasible to use DEM to verify the damage law of the constitutive model of cemented geomaterials. Under the three kinds of loading conditions, the damage rules assumed by the disturbance state model are consistent with the simulation results. The prediction results of the Nova model under the biaxial compression test conditions are quite different from the simulation results. The damage parameters assumed by the upper load-bearing Cambridge model It is not good to describe the damage law of the numerical sample under the above loading conditions.