(1 同济大学道路与交通工程教育部重点实验室上海 200092； 2 上海市政工程设计研究

院200092)

［提要］大型基坑工程都具有复杂、工程难度大、成本高等特点，对其进行优化设计尤为重要。以上海南站南广场大型基坑为例，对其设计进行优化。优化内容包括利用场地条件采取可靠措施减少围护墙荷载、改变支撑体系、减少支撑道数、调整预留土台及加固体宽度及高度并设置与改变支撑体系相适应的挖土施工工艺等。实施结果表明该优化方案能节约工程成本、缩短工期。

［关键词］基坑围护  设计优化  地下连续墙  支撑体系  中心岛工法

Optimization of Design for Large Foundation Pit Enclosure in Shanghai South Railway Station South Square/Chen Pei1,2, Bao Xufan2, Song Tiantian1(1 Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai 200092, China; 2 Shanghai Municipal Engineering Design Institute, Shanghai 200092, China)

Abstract:A large foundation pit has the feature of complexity, difficulty, and expressivity. So it is important to optimize the design. The design of foundation pit of South Square of South Railway Station in Shanghai is optimized. The aspects of optimization include support system, construction procedure, structure and consolidation, and so on. The results show that the optimized schedule can decrease the cost and time, so it provides a good reference for similar project.

Keywords:enclosure of foundation pit; design optimization; diaphragm wall; support system; the method of center island