| 软黏土地基中基槽开挖对桩基稳定性的影响分析 |
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| 引用本文： | 郭 超,闫澍旺,尹金凤.软黏土地基中基槽开挖对桩基稳定性的影响分析[J].岩土力学,2006,27(Z1):720-724. |
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| 作者姓名： | 郭 超 闫澍旺 尹金凤 |
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| 作者单位： | 1. 天津大学 建筑工程学院，天津 300072；2. 天津市建筑科学研究院，天津 300193 |
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| 摘 要： | 天津开发区经常出现的工程事故是由于软土中的桩基础受到周边开挖基槽的影响，严重时会导致桩基倾斜、错断。简要介绍了ABAQUS有限元软件的一些特性，包括接触问题的解决、屈服准则、材料参数的确定以及单元类型的选择等。通过工程算例，对该工程现象进行了数值模拟，找出开挖前后桩基础的变形特性，并且通过对桩基进行应力分析、桩基挠曲线的计算，分析说明开挖对桩基础变形、桩端转角、桩体挠曲特性、桩基整体稳定性的影响。结合桩基的力学特性与破坏准则，进一步剖析桩基的稳定性、破坏状态，为今后相似的工程实践提供一些借鉴。
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| 关 键 词： | 桩基础 变形 开挖 ABAQUS 数值模拟 |
| 收稿时间： | 2006-07-26 |
Influence of excavation on stability of pile foundation in soft clay |
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| GUO Chao,YAN Shu-wang,YIN Jin-feng.Influence of excavation on stability of pile foundation in soft clay[J].Rock and Soil Mechanics,2006,27(Z1):720-724. |
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| Authors: | GUO Chao YAN Shu-wang YIN Jin-feng |
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| Institution: | 1. School of Civil Engineering, of Tianjin University, Tianjin 300072, China; 2. Tianjin Municipal Research Institute of Building Science, Tianjin 300193, China |
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| Abstract: | Influence of excavation on pile foundation stability in a certain engineering of Tianjin Economy Developing Zone was analyzed by using ABAQUS program. Failure cases repeatedly take place in soft clay foundation in Tianjin area. The pile foundation in soft soil often is affected by the side excavation of foundation slot, even lead to the pile foundation to tilt and break. This paper establishes a model to simulate these phenomena by finding out the deformation, stress and the deflection of the pile foundation before and after excavation. The results demonstrate that the excavation can seriously influence the deformation, the rotation and the displacement of the pile foundation, the stability of the whole pile foundation; and combining the mechanical feature, the stability and destroy condition of pile foundation are anatomized. It can be a good example for other engineers. |
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| Keywords: | pile foundation deformation excavation ABAQUS numerical simulation |
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