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在RambergOsgood模型的基础上,建立了一个实用的能描述饱和砂土从液化前小应变到初始液化后大应变范围的非线性本构模型。该模型主要有三个特点:①采用作者曾提出的移动相态转换线(MPTL)和移动临界状态线(MCSL)概念来较为合理地描述变形过程中的有效应力路径和临界状态;②采用一个应力软化模型来描述剪胀和定义超静孔压变化引起的骨架曲线的软化与硬化;③基于笔者等提出的液化后大变形理论来描述初始液化后产生的大剪切变形。文中通过对室内循环剪切试验结果的模拟,验证了模型的预测能力。该模型适用于水平饱和砂土地基的有效应力地震反应分析。
Based on the Ramberg Osgood model, a practical nonlinear constitutive model describing the large strain range of saturated sand from the pre-liquefaction strain to the initial liquefaction is established. The model has three main features: (1) Adopting the concepts of MPTL and MCSL proposed by the author to describe the effective stress path and critical state in the deformation process reasonably; Soften the model to describe the dilatancy and define the softening and hardening of the skeleton curve caused by the excess pore pressure; and (3) describe the large shear deformation caused by the initial liquefaction based on the large deformation theory proposed by the author after liquefaction. In this paper, the simulation of indoor cyclic shear test results verify the predictive ability of the model. The model is suitable for the effective stress seismic response analysis of horizontal saturated sand ground.