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为了反映粗粒土主要力学特性,建立了亚塑性损伤模型。结合对粗粒土力学特性及物态演化的认识,提出了粗粒土的损伤状态函数。基于亚塑性理论的基本框架和损伤状态函数,建立了损伤模型的公式及参数确定方法。采用该模型对三峡二期围堰等3种实际工程试验结果进行了模拟。模型预测与试验结果吻合良好。该模型无需判断加卸载准则,易于三维化,公式简洁且参数较少,能够较好地反映粗粒土的主要力学特性,包括强度与围压的非线性特征以及在低围压下剪胀显著、高围压下剪缩较为显著的体变特性。
In order to reflect the main mechanical properties of coarse grained soil, a plastic damage model was established. Combined with the understanding of the mechanical properties of coarse grained soil and the evolution of matter, the damage state function of coarse grained soil is proposed. Based on the basic framework of the plasticity theory and the damage state function, the formula of the damage model and the parameter determination method are established. The model was used to simulate the three actual engineering tests of the second stage of the Three Gorges Project. The model predictions agree well with the experimental results. The model does not need to judge the loading and unloading criteria, easy to three-dimensional, the formula is simple and less parameters, can better reflect the main mechanical properties of coarse grained soil, including non-linear characteristics of strength and confining pressure and dilatancy at low confining pressure , High confining pressure shear more significant body deformation characteristics.