| 桩承式加筋地基室内试验及数值分析 |
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| 引用本文： | 刘飞禹,余炜,蔡袁强,张孟喜.桩承式加筋地基室内试验及数值分析[J].岩土力学,2012,33(Z1):244-250. |
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| 作者姓名： | 刘飞禹 余炜 蔡袁强 张孟喜 |
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| 作者单位： | 1. 上海大学 土木工程系，上海 200072；2. 浙江大学 软弱土与环境土工教育部重点实验室，杭州 310027 |
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| 基金项目： | 国家自然科学基金资助项目(No.50808119);国家高技术研究发展计划资助项目(No.2009AA032303);上海大学创新基金资助项目(2007年) |
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| 摘 要： | 为研究桩承式加筋地基作用机制及影响加筋效果的因素，设计天然软土地基、土工格栅加筋地基、桩承式地基、桩承式加筋地基4组模型试验，通过对试验结果的对比，分析阐述桩承式加筋地基的作用机制。同时，将三维数值模拟的结果与试验结果进行对比验证，在此基础上采用三维流固耦合的数值模型研究影响桩承式加筋地基处理效果的因素。研究结果表明，4组试验中，桩承式加筋地基加载板的沉降量最小，承载力最大；桩承式加筋地基的桩土应力比大于同样荷载条件下的桩承式地基；随着桩间距的增大，桩承式加筋地基表面沉降逐渐增大，桩土应力比逐渐减小；随着格栅模量的增加，桩承式加筋地基表面沉降逐渐减小，桩土应力比逐渐增大。
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| 关 键 词： | 桩承式加筋地基 模型试验 土工格栅 |
| 收稿时间： | 2011-01-18 |
Model test and numerical analysis of geogrid-reinforced pile-supported foundation |
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| LIU Fei-yu,YU Wei,CAI Yuan-qiang,ZHANG Meng-xi.Model test and numerical analysis of geogrid-reinforced pile-supported foundation[J].Rock and Soil Mechanics,2012,33(Z1):244-250. |
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| Authors: | LIU Fei-yu YU Wei CAI Yuan-qiang ZHANG Meng-xi |
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| Institution: | 1. Department of Civil Engineering, Shanghai University, Shanghai 200072, China; 2. MOE Key Laboratory of Soft Soils and Geoenviromental Engineering, Zhejiang University, Hangzhou 310027, China) |
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| Abstract: | In order to investigate the mechanism and the beneficial effect of geogrid-reinforced pile-supported foundation,four comparative model tests were carried out,including unreinforced and no-pile foundation,geogrid-reinforced foundation,pile-supported foundation without geogrid,geogrid-reinforced and pile-supported foundation.The mechanism of geogrid-reinforced pile-supported foundation was described by comparing the results of the tests.The measured and computed results were compared and discussed,and then three-dimensional coupled mechanical and hydraulic numerical simulations were conducted to investigate the beneficial effect of geogrid-reinforced pile-supported foundation.The results show that the vertical displacement of geogridreinforced and pile-supported foundation are smaller than that of other cases,while the bearing capacity is larger than that of others.The pile-soil stress ratio of geogrid-reinforced pile-supported foundation is less than that of pile-supported foundation without geogrid under the same loading.With the increase of the spacing between piles,the vertical displacement of geogrid-reinforced and pile-supported foundation increases,while the pile-soil stress ratio decrease.With the increase of geogrid stiffness,the vertical displacement of geogrid-reinforced and pile-supported foundation decrease,while the pile-soil stress ratio increase. |
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| Keywords: | geogrid-reinforced pile-supported foundation model tests geogrid |
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