| 桩承式路堤土拱效应发挥过程研究 |
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| 引用本文： | 费康,陈毅,王军军.桩承式路堤土拱效应发挥过程研究[J].岩土力学,2013,34(5):1367-1374. |
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| 作者姓名： | 费康 陈毅 王军军 |
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| 作者单位： | 1. 扬州大学 岩土工程研究所，江苏 扬州 225127；2. 河海大学 岩土力学与堤坝工程教育部重点实验室，南京 210098 |
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| 基金项目： | 国家自然科学基金项目(No. 50908198)；江苏省高校自然科学研究基金项目(No. 09KJB580004)；河海大学岩土力学与堤坝工程教育部实验室开放基金项目(No. GH200805)；江苏省青蓝工程资助项目。 |
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| 摘 要： | 通过三维模型试验对桩承式路堤中土拱效应发挥过程进行了研究，重点分析了不同桩顶盖板尺寸、不同加筋方式下应力折减系数与差异沉降之间的关系。结果表明，土拱效应随变形的增加而发挥；加筋材料的设置减小了差异沉降，削弱了填土中的土拱效应，荷载向桩顶的传递是土拱效应和拉膜效应共同作用的结果。采用有限元法对桩间距、填土高度等未能在模型试验中考虑的关键因素进行了参数敏感性分析，总结了土拱效应发挥过程的相关规律。根据有限元计算结果、试验数据和文献中收集到的实测资料，提出用土拱效应发挥系数和归一化位移来描述土拱效应的发挥过程，建议二者之间采用双曲线方程模拟，从而在设计中体现土拱效应随位移的发展，并满足路堤填土、加筋材料和地基之间的变形协调要求。
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| 关 键 词： | 桩承式路堤 土工加筋材料 土拱效应 差异沉降 模型试验 有限元 |
| 收稿时间： | 2012-03-02 |
Study of development of soil arching effect in piled embankment |
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| FEI Kang,CHEN Yi,WANG Jun-jun.Study of development of soil arching effect in piled embankment[J].Rock and Soil Mechanics,2013,34(5):1367-1374. |
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| Authors: | FEI Kang CHEN Yi WANG Jun-jun |
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| Institution: | 1. Institute of Geotechnical Engineering, Yangzhou University, Yangzhou, Jiangsu 225127, China; 2. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China |
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| Abstract: | In order to study the development of soil arching in the piled embankment, a series of three-dimensional model tests are conducted. The relationships between stress reduction ratio and ground settlement with different pile cap sizes and different geosynthetic reinforcement materials are analyzed in detail. Based on the test results, it is shown that the effect of soil arching develops gradually with differential settlement and it is more significant at large differential settlement. The inclusion of geosynthetic reinforcements reduces the differential settlement and weakens the soil arching effect correspondingly; and the load transfer from soil to pile top is caused by the combination of soil arching effect and tension membrane effect. The finite element sensitivity analyses are also carried out to study the effects of pile spacing, embankment height and other factors which did not included in the model tests. The focus of numerical analysis are laid on the development process of the soil arching effect and an index is proposed to describe the mobilized degree of the soil arching. Based on the test data, the results of the finite element analyses, and the experimental data collected from literature, a hyperbola equation is suggested to describe the relationship between the mobilized degree of the soil arching and the normalized deformation. The given equation can be used to account the development of soil arching with settlement. |
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| Keywords: | piled embankment geosynthetic reinforcement soil arching effect differential settlement model test finite element method |
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