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桩端持力层变化的加筋包裹碎石桩承载破坏分析 预览

Bearing failure analysis of geosynthetic-encased stone columns with bearing layer change at pile tip
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摘要 为研究不同桩端持力层和筋材包裹长度、筋材布设位置对加筋包裹碎石桩承载性能的影响,在室内试验结果基础上,利用三维有限元方法建立不同参数的数值模型,分析桩体承载应力、桩土应力比、桩体侧向变形及塑性应变等参数变化规律.研究结果表明:桩端持力层承载力越高,筋材的包裹约束作用越大,持力层弹性模量从0.6MPa增加到6.0MPa,加筋包裹碎石桩复合地基承载力提高了22%;加筋包裹碎石桩的筋材包裹长度越长、桩端持力层承载力越大,相应的桩土应力比越大,越有利于发挥加筋包裹碎石桩的承载性能. In order to study the influence of different pile end bearing layer,reinforced length and placement position of geosynthetics on the bearing capacity of geosynthetic-encased stone columns,the numerical model of different parameters was established by using the three-dimensional finite element method,and the changes of parameters such as bearing stress of pile,stress ratio of pile soil,lateral deformation and plastic strain of geosynthetic-encased stone columns were analyzed.The results show that the higher the bearing capacity of the bearing layer at the pile end,the greater the role of the reinforcement material,the higher the elastic modulus of the bearing layer from 0.6 MPa to 6.0 MPa,and the bearing capacity of the composite foundation increased by 22%.The longer the wrapped length of geosynthetic-encased stone columns,the larger the bearing capacity of bearing layer of pile tip,and the larger the corresponding stress ratio of pile soil,the better the bearing performance of reinforced gravel pile.
作者 李云峰 王家全 梁乘玮 LI Yunfeng;WANG Jiaquan;LIANG Chengwei(Nanning Building Quality Safety Management Center,Nanning 530022,China;School of Civil Engineering and Architecture,Guangxi University of Science and Technology,Liuzhou 545006,China)
出处 《广西科技大学学报》 2019年第1期12-18,30共8页 Journal of Guangxi University of Technology
基金 国家自然科学基金项目(51469005) 广西自然科学基金项目(2015GXNSFAA139257,2015GXNSFAA139270,2017GXNSFAA198170)资助.
关键词 土工格栅 加筋包裹 碎石桩 破坏模式 geogrid geosynthetic-encased stone columns failure mode
作者简介 通信作者:王家全,博士,教授,研究方向:加筋结构、细观岩土力学、地基基础工程,E-mail:wjquan1999@163.com
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