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为了对加筋砂土挡墙面板的刚度效果有一个合理、定量的把握,利用非线性硬化-软化弹塑性有限元方法对相关的一系列室内模型试验结果进行了系统全面的数值分析。有限元解析中所采用的砂土本构模型是以修正塑性功为基本状态量的弹塑性硬软化模型,该模型可以较为精确地模拟砂土的应力路径效应。结果表明,利用这种较高精度的有限元方法对加筋砂土挡墙的变形破坏进行解析,不仅能较好地模拟加筋砂土挡墙基础底面的平均压力与沉降之间的关系,同时也能较好地再现由于面板刚度变化对加筋砂土挡墙基础的承载力以及渐进性变形破坏的影响。随着面板刚度的增加,面板对剪切带的抑制作用将随之增加,具体表现在砂土围压σ3增大所带来的砂土强度σ1的提高,进而使得加筋砂土挡墙的峰值承载力也随之增大。
In order to have a reasonable and quantitative grasp of the stiffness effect of reinforced sand-soil wall panels, a series of numerical results of the indoor model tests were systematically and comprehensively analyzed by using the nonlinear hardening-softening elasto-plastic finite element method. The sand-soil constitutive model used in finite element analysis is an elasto-plastic softening model based on the modified plastic work as the basic state quantity. This model can simulate the stress path effect of sand more precisely. The results show that the analysis of the deformation and failure of the reinforced sand retaining wall using this high precision finite element method can not only well simulate the relationship between the average pressure and the settlement of the bottom surface of the reinforced sand retaining wall, At the same time, the influence of the stiffness of the panel on the bearing capacity of the foundation of the reinforced sand-retaining wall and the progressive deformation and failure can also be reproduced well. With the increase of the stiffness of the panel, the inhibition effect of the panel on the shear band will increase, which is manifested in the increase of the sand strength σ1 caused by the increase of the confining pressure σ3 of the sand so as to make the Peak carrying capacity also increases.