Alternative Title
Paper No. 5.01
Location
St. Louis, Missouri
Date
11 Mar 1998, 10:30 am - 12:30 pm
Abstract
This paper presents a case history on the failure of an excavation bracing system. The engineering projects involved the construction of the New World Plaza in Changchun, China. The plaza building had a 3-story deep basement which supported an 8-story building together with a 42-story main tower. The excavation area was surrounded by streets on three sides and an on-going 8-m deep excavation along the fourth side. The excavation varied from 15 m to 16 m in depth and was braced with 157 anchored cast-in-place reinforced concrete piles. The bracing system failed as soon as the design depth was reached. Primary causes of the bracing failure included improper installation of the tieback anchors, inadequate stiffness and strength of the wales, and adverse effects of freezing temperatures. It was remedied by reducing the mat foundation area together with the installation of short piles against the load bearing wall.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
4th Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 1998 University of Missouri--Rolla, 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
Wang, M. S.; Wu, X.; and Wang, M. C., "Failure of Excavation Bracing System for New World Plaza at Changchun in China" (1998). International Conference on Case Histories in Geotechnical Engineering. 6.
https://scholarsmine.mst.edu/icchge/4icchge/4icchge-session05/6
Failure of Excavation Bracing System for New World Plaza at Changchun in China
St. Louis, Missouri
This paper presents a case history on the failure of an excavation bracing system. The engineering projects involved the construction of the New World Plaza in Changchun, China. The plaza building had a 3-story deep basement which supported an 8-story building together with a 42-story main tower. The excavation area was surrounded by streets on three sides and an on-going 8-m deep excavation along the fourth side. The excavation varied from 15 m to 16 m in depth and was braced with 157 anchored cast-in-place reinforced concrete piles. The bracing system failed as soon as the design depth was reached. Primary causes of the bracing failure included improper installation of the tieback anchors, inadequate stiffness and strength of the wales, and adverse effects of freezing temperatures. It was remedied by reducing the mat foundation area together with the installation of short piles against the load bearing wall.
