Location
Chicago, Illinois
Date
02 May 2013, 4:00 pm - 6:00 pm
Abstract
This paper presents a case history of a deep excavation for building foundation in Shanghai soft deposit. The excavated area was about 15916 m2. The excavation depth at the tower part was 15.0 m and at the podium part was 14.5 m to 15.2 m. Around the excavated pit, there existed many facilities including roads, the shield tunnels of the No.7 Metro, buildings, and pipelines. Zoned excavation method was adopted in this project. The excavation was divided into a relatively small pit (Zone I) and a big pit (Zone II). The small pit was just adjacent to the tunnels. The small pit and the big pit were separated by temporary diaphragm walls. The small pit was firstly constructed by bottom-up method. The big pit was constructed after the completion of the construction of the small pit. Top-down method was adopted for the big pit. Detailed construction sequences were introduced. An extensive instrumentation program was carried out to monitor the performance of the excavation and the adjacent facilities. The monitored data of the retaining structure and the surrounding facilities were analyzed. Observed results show that zoned excavation method was effective in controlling the deformation of the adjacent tunnels.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
7th Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2013 Missouri University of Science and Technology, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Xu, Z. H.; Zhang, J.; and Chen, C., "A Case History of a Deep Foundation Pit Constructed by Zoned Excavation Method in Shanghai Soft Deposit" (2013). International Conference on Case Histories in Geotechnical Engineering. 1.
https://scholarsmine.mst.edu/icchge/7icchge/session03/1
A Case History of a Deep Foundation Pit Constructed by Zoned Excavation Method in Shanghai Soft Deposit
Chicago, Illinois
This paper presents a case history of a deep excavation for building foundation in Shanghai soft deposit. The excavated area was about 15916 m2. The excavation depth at the tower part was 15.0 m and at the podium part was 14.5 m to 15.2 m. Around the excavated pit, there existed many facilities including roads, the shield tunnels of the No.7 Metro, buildings, and pipelines. Zoned excavation method was adopted in this project. The excavation was divided into a relatively small pit (Zone I) and a big pit (Zone II). The small pit was just adjacent to the tunnels. The small pit and the big pit were separated by temporary diaphragm walls. The small pit was firstly constructed by bottom-up method. The big pit was constructed after the completion of the construction of the small pit. Top-down method was adopted for the big pit. Detailed construction sequences were introduced. An extensive instrumentation program was carried out to monitor the performance of the excavation and the adjacent facilities. The monitored data of the retaining structure and the surrounding facilities were analyzed. Observed results show that zoned excavation method was effective in controlling the deformation of the adjacent tunnels.
