| 开挖条件下坑底工程桩工作性状及沉降计算分析 |
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| 引用本文： | 郑刚,张立明,刁钰.开挖条件下坑底工程桩工作性状及沉降计算分析[J].岩土力学,2011,32(10):3089-3096. |
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| 作者姓名： | 郑刚 张立明 刁钰 |
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| 作者单位： | 1.天津大学 土木工程系，天津 300072；2.天津大学 滨海土木工程结构与安全教育部重点实验室，天津 300072 |
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| 基金项目： | 国家自然科学基金资助项目(No.50878144); 国家重点基础研究发展计划(973计划)资助项目(No.2010CB732106) |
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| 摘 要： | 基坑开挖对坑内工程桩的影响不可忽视。基于工程试桩实测资料验证的有限元参数，对地面加套管试桩及基坑开挖条件下不同长度单桩进行有限元计算，研究了深厚软土地区在以常规试桩法得到的单桩极限承载力设计的桩基础的承载及变形性状。计算结果表明，基坑开挖条件下坑底工程桩侧阻和端阻异步发挥的现象明显。设计工作荷载下，长度超过40 m的桩的端阻比几乎为0。同时，桩身侧阻呈“R”形分布，长度大于80 m的单桩桩身下部甚至还存在一定的拉力，桩身下部存在较大范围的负摩阻区。考虑开挖条件下侧阻分布特点的沉降计算值要较Geddes假设分布模式下的沉降值更接近于实测结果。
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| 关 键 词： | 基坑开挖 荷载传递 有限元分析 沉降计算 |
| 收稿时间： | 2011-02-21 |
Analysis of working performance of piles beneath excavation bottom and settlement calculation |
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| ZHENG Gang,ZHANG Li-ming,DIAO Yu.Analysis of working performance of piles beneath excavation bottom and settlement calculation[J].Rock and Soil Mechanics,2011,32(10):3089-3096. |
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| Authors: | ZHENG Gang ZHANG Li-ming DIAO Yu |
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| Institution: | 1. Department of Civil Engineering, Tianjin University, Tianjin 300072, China; 2. MOE Key Laboratory of Coast Civil Structures and Safety, Tianjin University, Tianjin 300072, China |
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| Abstract: | The effect of deep excavation on piles beneath the excavation bottom should not be ignored.Based on the verified finite element parameters of a project in Tianjin,load tests with sleeve and under excavation of piles with different lengths are analyzed.The characters of load transfer and settlement of piles designed by conventional pile load tests are analyzed in deep soft soil region.From the finite element analysis results,some conclusions are drawn as follows.The shaft resistance and tip resistance of pil... |
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| Keywords: | excavation load transfer finite element analysis settlement calculation |
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