刘兴旺，陈卫林，李志飙，施祖元

（浙江省建筑设计研究院，杭州 310006）

 

［摘要］杭州市中心某工程地下室紧贴用地红线，周边为重要市政道路及诸多浅基础建筑物。该工程原设二层地下室，采用地下连续墙（二墙合一）结合两道钢筋混凝土内支撑的围护结构。地下连续墙、工程桩、支撑竖向立柱施工完毕后，地下室调整为三层，基坑开挖深度加深了4m。地下室加深后，已经施工完毕的地下连续墙插入深度不足以满足最新的开挖深度要求，且原有竖向钢立柱底标高高于地下室底板面标高，钢立柱底部悬空。介绍了地下室增层后的围护设计措施、施工过程以及监测成果，分析了地下室加深后的基坑变形性状。工程的实践表明，合理地确定新增地下空间范围是地下室增层围护的关键，组合式的支护结构可通过合理地分解措施，简化计算模型。

［关键词］基坑支护;立柱托换;地下连续墙;基坑加深

中图分类号：TU 942文献标识码：B文章编号：1002-848X(2012)08-0104-03

 

Liu Xingwang, Chen Weilin, Li Zhibiao, Shi Zuyuan

(Zhejiang Province Institute of Architectural Design and Research, Hangzhou 310006, China)

 

Abstract: Surrounded by important roads and shallow foundation buildings, the foundation pit of a project in Hangzhou with 2-layers basement had been designed to be retained by diaphragm walls combined with concrete struts. When the construction of diaphragm walls, foundation piles and steel lattice columns were finished, the basement layers were changed to 3-The finished diaphragm walls and steel lattice columns were not deep enough for the new foundation pit. The modified retaining structure, construction process, and field monitoring data are introduced, deformation behavior of foundation pit during excavation is given. It shows that the reasonable range of the third basement layer is very important for the modified design, and simplified model can be used to analyze the combined retaining structure.

Keywords: foundation pit;steel lattice column;diaphragm walls;change of excavation depth

作者简介：刘兴旺(1969—)，男，博士，教授级高工，研究方向为建筑结构与岩土工程，Email:xwliu@hzcnc.com。