Practices of central island with inclined bracings for super-large excavations in soft-soil areas
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摘要: 以面积达4万m2的上海浦江镇125-2地块基坑工程为背景，详细介绍了中心岛斜撑支护体系的选型依据、工况流程及有限元数值分析情况，并对实施过程中的关键技术包括周边留土放坡、基础底板受力体系及拆换撑变形控制进行了重点阐述，最后就监测数据分析总结心得体会，从而为今后类似工程的设计、施工和研究提供有益的借鉴。Abstract: The application of the excavation method of central island with inclined bracings in No. 125-2 Pujiang Town, Shanghai with an area of 40000 m2 is introduced. The selection condition, operating model flow and FEM numerical analysis are presented. The key techniques including surrounding slope protection in passive soils, force resistance system of foundation plates and deformation control within support replacement are highlighted. In the end, based on the analysis and summarization of monitoring results, some reasonable opinions are given. The experience and conclusions may be helpful to the design, construction and research of similar or even larger projects in the future.
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Keywords:
- super-large excavtion /
- central island method /
- inclined bracing /
- soft-soil area /
- bracing
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