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加筋砂土挡墙面板刚度效果的数值分析

ISSN号：1000-7598
期刊名称：岩土力学
时间：0
页码：864-871
分类：TU441.4[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]同济大学地下建筑与工程系,上海200092, [2]同济大学岩土及地下工程教育部重点实验室,上海200092
相关基金：国家自然科学基金（No.40972176）; 教育部长江学者和创新团队发展计划资助（IRT1029）; 上海市重点学科建设项目（No.B308）
相关项目：基于应变速率内变量砂土的粘塑特性及流变本构模型研究

关键词：加筋砂土挡墙, 有限元法, 弹塑性本构模型, 面板刚度效果, 渐进性变形破坏, reinforced-sand retaining wall, finite element method, elastoplastic constitutive model, effect of facing rigidity, progressive deformation and failure

中文摘要：

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。

英文摘要：

To better understand the effect of facing rigidity on the deformation and failure of reinforced-sand retaining wall,a series of results obtained from the laboratory model tests with different facing rigidities,are simulated by a nonlinear FEM incorporating an elastoplastic constitutive model for sand.The constitutive model has been developed based on the modified plastic strain energy concept,which can simulate the effect of stress path accurately.By the comparisons between the numerical and experimental results,it is found that the load-settlement relationships of the reinforced-sand walls and the effects of facing rigidity on the bearing capacity and deformation and failure of reinfroced-sand retaining walls obtained by the presented FEM agree well with those from the physical experiment.With the increase of facing rigidity,the inhibition of facing on the shear bands increases and the peak bearing capacity of reinforced-sand retaining walls are also improved due to the increase of the sand strength σ1 induced by the increase of the confining pressure σ3 of sand.

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