(1. Architectural Design & Research Institute of Tongji University (Group) Co., Ltd., Shanghai 200092 China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China.)
Abstract： An in-depth exploration of the top-down method for large-scale basement excavation and construction in saturated soft clay area in Shanghai is introduced with respect to its application, design difficulties as well as techniques to mitigate deformation and to ensure safety and stability of the excavation. Researches are carried out with the reference to the top-down method applied to the basement construction under podium of Shanghai Tower, the tallest building in China when it is completed, which will stand at a height of 632 m in Lujiazui CBD area. It is intended to serve as a future reference for similar projects.
[1] JIA J, XIE X L, LIU C P, et al. Design and research of circular diaphragm wall for deep excavation of shanghai tower[C]// Geotechnical Special Publication: Deep and Underground Excavations, GSP 206, ASCE, 2010: 24–36.[2] 贾 坚. 逆作开挖深基坑控制卸载变形的方法与实践[J]. 岩土工程学报, 2007, 29(2): 304–308. (JIA Jian. Deflection controlling measures and practices of deep foundation pits by use of top-down excavation method[J]. Chinese Journal of Geotechnical Engineering, 2007, 29(2): 304–308. (in Chinese))[3] 贾 坚, 谢小林. 上海软土地区深大基坑卸荷变形机制[J]. 上海交通大学学报, 2009, 43(6): 1005–1010. (JIA Jian, XIE Xiao-lin. Unloading deformation mechanism of deep-large excavation in shanghai clay area[J]. Journal of Shanghai Jiaotong University, 2009, 43(6): 1005–1010. (in Chinese))[4] DG/TJ 08—61—2010 基坑工程技术规范[S]. 2010: 150. (DG/TJ 08—61—2010 Technical code for excavation engineering[S]. 2010: 150. (in Chinese))
