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加筋土地基模型试验边界效应与承载性能分析
Analysis of boundary effect and bearing capacity of reinforced soil model test
投稿时间:2020-02-14  修订日期:2020-03-26
DOI:
中文关键词:  加筋地基  边界效应  有限元  极限承载力  影响范围
英文关键词:reinforced foundation  boundary effect  finite element  the ultimate bearing capacity  influence scope
基金项目:国家自然科学基金项目(41962017);广西自然科学基金项目(2017GXNSFAA198170)
作者单位E-mail
王家全 广西科技大学土木建筑工程学院 wjquan1999@163.com 
柏蕾 广西科技大学土木建筑工程学院  
林志南 广西科技大学土木建筑工程学院  
唐毅 广西科技大学土木建筑工程学院  
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中文摘要:
      基于室内方形基础下加筋地基大模型试验,采用ABAQUS有限元软件建立加筋地基数值模型,进一步探讨边界效应对加筋地基的影响,主要分析了模型宽度L和加载板宽度B对加筋地基承载性能、地基内部土体应力应变及筋材变形的影响。结果表明:无筋地基与加筋地基极限承载力均随L/B的减小而增大,当L/B>5时,可忽略边界效应对加筋地基的影响;当L/B<2.67时,边界效应对加筋地基的影响最大;当L/B>4时,边界效应对无筋地基的影响可忽略不计;加筋能够显著改善地基土体的不均匀沉降和减小基础两侧土体隆起高度;竖向应力分布区域随着B的增大而增大,加筋地基受竖向荷载的影响宽度为5B,影响深度约为2.57B-4B;当L/B>5时,不同L/B工况下土体变形、应力分布及格栅变形曲线基本重合,此时加筋地基受边界效应的影响可忽略不计。
英文摘要:
      Based on large-scale model tests of reinforced foundations under indoor square foundations, ABAQUS finite element software is used to establish a numerical model of reinforced foundations, and the effects of boundary effects on reinforced foundations are further explored.The effects of the model width and the loading plate width on the bearing capacity of the reinforced foundation, the internal soil stress and strain and the deformation of the reinforcement are analyzed. The results show that geogrid reinforcement can significantly improve the uneven settlement and height of the foundation soil. As the distance from the loading plate to the model increases, the ultimate bearing capacity of the reinforced foundation and unreinforced foundation both increase. When L/B is greater than 5, the boundary effect has less influence on the reinforced foundation. When L/B is greater than 4, the boundary effect has less influence on the unreinforced foundation. The vertical stress distribution area increases with the increase of the width of the loading plate. The affected width of the reinforced foundation under vertical load is 5B, and the depth of influence is about 2.57B-4B. When L/B is greater than 5, the soil deformation, stress distribution and grid deformation curve are basically coincident. It should be ensured that L/B is greater than 5 in the reinforced foundation plate loading test ,so as to control the influence of boundary effect on the results of reinforced foundation plate loading text.
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