海上人工岛内深基坑变形与稳定分析

丁勇春; 李光辉; 王建华

海上人工岛内深基坑变形与稳定分析 English Version

(1.中交第三航务工程勘察设计院有限公司，上海 200032；2. 上海交通大学土木工程系，上海 200240)

详细信息

作者简介:
丁勇春(1979– )，男，江苏大丰人，博士，高级工程师，主要从事基坑工程及港口岩土工程的设计与研究工作。

中图分类号: TU473.5；U655.54
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出版历程
- 收稿日期: 2012-11-12
- 发布日期: 2012-11-12

Deformation and stability of deep excavations in artificial offshore island

(1. CCCC Third Harbor Consultants Co., Ltd., Shanghai 200032, China; 2. Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China)

摘要

摘要: 采用数值方法研究了某跨海大桥海上人工岛内隧道基坑的变形性状与整体稳定性。基于有限元程序Plaxis建立考虑复杂施工条件下土与结构相互作用的平面应变计算模型，分析坑中坑方案和大开挖方案两种不同基坑开挖方法对大直径钢圆筒岸壁结构及基坑围护桩变形、整体稳定性及失稳破坏模式的影响。研究表明：相对大开挖方案，最不利状态下坑中坑方案使钢圆筒相对侧向变形由1.41%降至0.69%，结构整体稳定安全系数由1.51增至1.68，结构失稳破坏模式由钢圆筒绕其下部倾覆转动转变为岛内土体绕围护桩滑移，但坑中坑方案由于增加了临时围护结构的施工，对工期和投资的影响较大。由于两种开挖方案均能满足基坑的安全度控制要求，同时又不涉及基坑变形对周边环境的影响，大开挖方案对工期及投资控制更有利。
- 人工岛 /
- 水上基坑 /
- 大直径钢圆筒 /
- 数值模拟 /
- 变形 /
- 稳定
Abstract: A two-dimensional finite element method (FEM) numerical simulation was carried out to investigate the deformation behavior and the global stability of the large-diameter steel cylinder bulkhead as well as the steel tube pile retaining structure in combination with the practice of a waterfront tunnel pit excavation in an artificial offshore island. Two numerical models were established respectively with Plaxis to compare the performance of the local excavation scheme and the large excavation scheme under complex construction conditions. The numerical results show that the local excavation scheme can reduce the relative lateral deformation of the steel cylinder bulkhead from 1.41 percent to 0.69 percent, raise the safety factor of global stability from 1.51 to 1.68, and transform the collapse mode of the structures from the type of steel cylinder overturning rotation around its bottom to the type of block slide around the steel tube pile top in the island. Nevertheless, the local excavation scheme may prolong the construction period and increase the project investment owing to the additional construction of temporary retaining structure. Both of the excavation schemes can satisfy the safety control requirements of stability; meanwhile, relatively large deformation of the excavation will not bring negative impact on the surroundings. The large excavation scheme is more favorable in construction period and project investment control than the local excavation scheme.
- artificial island /
- waterfront excavation /
- steel cylinder /
- numerical simulation /
- deformation /
- stability

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参考文献(13)

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