| 摘要: |
| 洋山深水港区是世界上第一个外海孤岛建港的工程，该工程在外海深水区首次采用大直径砂桩进行软弱淤泥质地基加固.根据实际工程地质概况，建立了接岸结构以及砂桩加固土层的三维有限元模型，对不同砂桩地基加固方案进行了数值模拟，研究了不同加固方案下接岸结构桩基内力、承台位移、加固土层的变形特征及影响接岸结构的稳定因素；针对砂桩加固软土地基的方法与机理，对洋山深水港区砂桩加固范围、砂桩加固深度以及砂桩置换率进行了优化分析，为外海深水区类似工程采用大直径砂桩加固软土地基的设计提供了理论基础和实际依据. |
| 关键词: 数值模拟 大直径砂桩 地基加固 接岸结构 |
| DOI： |
| 分类号:TV92； TU472.3+2 |
| 基金项目:中央高校基金项目（2009B10114） |
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| Optimum analysis of foundation stabilization by large diameter sand piles in Yangshan deep water port area |
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ZHUANG Ning1, GE Song1, FANG Jun-hua2, WANG Da-gang2
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1.College of Harbor， Coastal and Offshore Engineering， Hohai University;2.China Communications Third Harbor Consultants Co.， Ltd.
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| Abstract: |
| The Yangshan deepwater port project is the first port constructed along a reef island in the open sea in the world. The large-diameter sand piles are also firstly used in the Yangshan deepwater project to reinforce the soft silt foundation of the shore connecting structure in the deep water of the open sea. In this paper, in order to understand the bearing capacity of the sand piles and the connecting structure, a 3D finite element model is developed to numerically simulate different construction conditions of the sand pile foundation stabilization based on realistic geologic conditions. The reinforcing mechanism of the sand piles is studied to optimize the large-diameter sand pile′s reinforcing area， reinforcing depth and replacement ratio by the force and deformation characteristics of the shore connecting structure and the settlement and deformation behaviors of the soil layers in different sand column reinforcement plans. The research results provide a scientific basis and technical guidance for the optimization of construction in the similar projects in the open sea in the future. |
| Key words: numerical simulation large diameter sand pile foundation stabilization shore connecting structure |
