"两墙合一"深基坑工程设计中的若干技术问题与对策

地下连续墙刚度大,变形小,作为基坑开挖阶段的围护结构可有效的保护周边环境。“两墙合一”的设计使其兼作永久使用阶段的地下室结构外墙,经济效益显著。本文以上海世茂北外滩酒店基坑工程的设计和实施为背景,对“两墙合一”地下连续墙与临时围护结构的连接、在结构梁板大面积缺失情况下的处理措施以及支撑结合施工栈桥的设计等作了比较详细的介绍。这些针对常见工程问题的处理措施在工程实践中取得了良好的实施效果,值得在同类工程的设计中借鉴和参考。

Design of dual-purpose diaphragm walls in deep foundation pits

Diaphragm walls are commonly used as retaining structures in many deep foundation pits,especially when the environment protection is severe.The design of dual-purpose diaphragm walls means that the walls are used as retaining walls as well as outside walls of the basement.It has been proved that the dual-purpose diaphragm walls are economic.The foundation pit of Shimao North Beach Hotel project has an area of 12000 m2 and depth of 14.3~15.3 m.Dual-purpose diaphragms are applied successfully in this deep foundation pit.Some special technologies such as junction of diaphragm walls and temporary retaining structures,design of T-shape diaphragm walls,brace designed as trestle and so on are applied.These solutions provide a good reference for other similar projects.