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研究了颗粒破碎对硬化准则和剪胀性的影响,提出了修正后的硬化准则和剪胀方程,并基于有效塑性功的概念,建立了考虑颗粒破碎的粗粒土临界状态弹塑性本构模型。将所提出的模型与未考虑颗粒破碎的模型用于不同围压下粗粒土室内大三轴试验的数值模拟,对比分析表明:模型计算结果与试验实测结果更为一致,能较好地描述低围压和相对中高围压下的强度和变形特性,得出颗粒破碎导致粗粒土强度降低,压缩变形增大,并利用离散单元法模拟一维压缩颗粒破碎试验对该结论进行了验证。
Based on the concept of effective plastic work, the critical elasto-plastic constitutive model of coarse grained soil considering particle breakage is established. The influence of particle crushing on the hardening criterion and dilatancy is studied. The modified hardening criterion and dilatancy equation are proposed. . The proposed model and the model without particle crushing are applied to the numerical simulation of large triaxial tests in coarse grained soil under different confining pressure. The comparative analysis shows that the calculated results of the model are more consistent with the experimental results and can be well described Low confining pressure and relative middle and high confining pressure. The results show that the particle crushing leads to the decrease of the strength of the coarse-grained soil and the increase of the compressive deformation, and the conclusion is verified by using discrete element method to simulate the one-dimensional compressive particle crushing test.