Location

Chicago, Illinois

Session Start Date

4-29-2013

Session End Date

5-4-2013

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

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Seventh Conference

Publisher

Missouri University of Science and Technology

Publication Date

4-29-2013

Document Version

Final Version

Rights

© 2013 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 29th, 12:00 AM May 4th, 12:00 AM

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.