| 短桩基础桩-土共同作用的原位测试与数值分析 |
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| 引用本文： | 陈锦剑,王建华,范巍,王恺敏.短桩基础桩-土共同作用的原位测试与数值分析[J].岩土力学,2009,30(2):478-482. |
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| 作者姓名： | 陈锦剑 王建华 范巍 王恺敏 |
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| 作者单位： | 上海交通大学,土木工程系,上海,200030 |
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| 基金项目： | 国家自然科学基金，上海市重点学科建设项目 |
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| 摘 要： | 通过对湖沼平原一个6层建筑的短桩原位测试和数值分析，研究了短桩基础的荷载传递与变形特性。试验结果表明，桩基的实际承载力大于计算值，而沉降远小于计算值。桩顶反力和基底土压力的观测结果显示：地基土所分担的荷载较小。对短桩基础的桩-土共同作用进行数值分析，得到了地基土层内的附加应力和分层沉降变化情况。研究结果表明，湖沼平原短桩基础的沉降以桩端以下土层的压缩变形为主。浅部硬土层既作为短桩的持力层，又有利于附加应力的扩散，从而减小了沉降。
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| 关 键 词： | 短桩 桩-土共同作用 荷载传递 沉降 原位测试 数值分析 |
| 收稿时间： | 2007-07-12 |
In-situ test and numerical analysis of pile-soil interaction behavior of short-pile foundation |
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| CHEN Jin-jian,WANG Jian-hua,FAN Wei,WANG Kai-min.In-situ test and numerical analysis of pile-soil interaction behavior of short-pile foundation[J].Rock and Soil Mechanics,2009,30(2):478-482. |
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| Authors: | CHEN Jin-jian WANG Jian-hua FAN Wei WANG Kai-min |
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| Institution: | Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200030, China |
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| Abstract: | The load transfer and deformation behavior of the short pile foundation is studied by the experimental and numerical analysis of a case history of six-story building in the lacustrine deposits. The test results show that the real bearing capacity of pile is more than 1.6 times of that calculated by Shanghai codes and the observed settlement of pile foundation is less than the predicted value. The interactive behavior between the piles and subsoil is analyzed by measuring the contact pressure under footing, which shows that the bearing capacity of shallow subsoil is neglected. The stress increase and deformation in the soil are obtained by numerical analysis of the short pile-soil interaction. The results show that the settlement of the short pile foundation is mainly caused by the compressiom of the soil under pile bottom, and reduced by the stress diffusing in the shallow leck which is the bearing layer of pile. |
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| Keywords: | short pile pile-soil interaction load transfer deformation in-situ test numerical analysis |
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