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饱和砂土在循环加卸载过程中,土体发生显著的组构变化和塑性变形的累积.试验现象分析表明,循环过程中,砂土的首次与再循环塑性模量既有区别又有联系.因此,论文引入考虑组构变化的剪胀内变量,并提出循环塑性模量的关系式,真实描述上述两种现象;进而基于已有本构模型的基础,建立饱和砂土的循环边界面本构模型.最后,将饱和砂土的模型预测结果与三轴试验结果进行验证对比,得到较好地吻合,这表明该模型能够合理反映饱和砂土循环加卸载的变形行为.
During the process of cyclic loading and unloading, the saturated soils accumulate significant structural changes and plastic deformation.The analysis of the test results shows that there is a difference and correlation between the initial and recirculating plastic moduli of sand in the circulation process. Therefore, the thesis introduces the internal variables of dilatancy which take into account the change of structure, and puts forward the relational formula of cyclic plastic modulus, and realizes the above two phenomena; then based on the existing constitutive model, establishes the boundary surface of saturated sand Finally, the model predictions of saturated sands are validated and compared with the results of triaxial tests, which shows that the model can reasonably reflect the deformation behavior of saturated sands under cyclic loading and unloading.