| 筒桩桩承式路堤土拱效应的三维数值模拟 |
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| 引用本文： | 高雁,;豆红强.筒桩桩承式路堤土拱效应的三维数值模拟[J].中南公路工程,2014(3):251-255. |
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| 作者姓名： | 高雁 ;豆红强 |
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| 作者单位： | [1]台州职业技术学院建筑工程学院,浙江台州318000; [2]浙江大学浙江大学滨海和城市岩土工程研究中心,浙江杭州310058 |
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| 摘 要： | 考虑大直径薄壁筒桩所特有的大桩径、大桩距的特点,对筒桩桩承式路堤中的土拱效应进行了三维有限元数值模拟。重点分析了筒桩桩承式路堤中的竖向应力分布规律、大主应力方向以及土拱效应系数等反映土拱效应的变量,同时探讨了筒桩桩承式路堤中桩帽对土拱效应的贡献。计算结果表明,随着堆载高度的增加筒桩桩承式路堤中的竖向应力随深度非线性减小;大主应力方向平行于两相邻桩帽之间的圆拱连线,且桩帽的存在使土拱效应的发挥程度提高了40%之多。研究结果为工程应用提供了一定的理论基础。
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| 关 键 词： | 筒桩 桩承式路堤 土拱效应 数值模拟 桩帽 |
3-D Simulations on Soil Arching of Reinforced Embankment Supported by Cast-in-situ Thin-wall Tubular Piles |
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| Institution: | GAO Yan , DOU Hongqiang (1. Department of Architecture, Taizhou Vocational ＆ Technical College, Taizhou, Zhejiang 318000, China; 2. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Han- gzhou, Zhejiang 310058, China) |
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| Abstract: | Considering the unique features of the bigger pile diameter and pile distance of the cast- in-situ thin-wall tubular pile, a 3-D numerical model has been established to simulate the behavior of soil arching in the piled embankment. The distribution of vertical stress, orientation of maximum principal stresses and the coefficient of soil arching are analyzed in detail. The calculation results show that the vertical stress in the embankment decreases with the depth non-lineally. The direction of maximum prin- cipal stresses parallels to the line of circle arch of two adjacent pile caps, and the existence of pile cap makes the degree of soil arching increase 40%. The results supply the theoretical basis for engineering application. |
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| Keywords: | cast-in-situ thin-wall tubular pile piled embankment soil arching numerical simu-lation pile cap |
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