Location
St. Louis, Missouri
Date
03 Jun 1993, 10:30 am - 12:30 pm
Abstract
Rising and effluent mains of 600 mm and 750 mm diameter were constructed at two adjacent creek crossings in New South Wales, Australia. A bund wall was constructed across each creek and the mains were laid in a trench excavated through the bund wall into the underlying soft deposit. Foundation preparation consisted of pouring rockfill into the trench and compacting with a few strikes of the excavator bucket. After construction unacceptably large joint openings of up to 120 mm in width were measured. The authors were engaged to undertake a review of the geotechnical characteristics of the crossings and comment on the construction method employed by the contractor. This paper outlines the conditions encountered, discusses the analytical methods used to calculate movements of the mains and effective depth of rockfill and compares the results with the measured values. It is found that rockfilling for foundation strengthening was unsuitable for this site.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
3rd Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 1993 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
Rahimi, M. M.; Karwaj, C.; and Deb, P. K., "Failure of Sewerage Mains Constructed in Soft Estuarine Deposit" (1993). International Conference on Case Histories in Geotechnical Engineering. 16.
https://scholarsmine.mst.edu/icchge/3icchge/3icchge-session05/16
Failure of Sewerage Mains Constructed in Soft Estuarine Deposit
St. Louis, Missouri
Rising and effluent mains of 600 mm and 750 mm diameter were constructed at two adjacent creek crossings in New South Wales, Australia. A bund wall was constructed across each creek and the mains were laid in a trench excavated through the bund wall into the underlying soft deposit. Foundation preparation consisted of pouring rockfill into the trench and compacting with a few strikes of the excavator bucket. After construction unacceptably large joint openings of up to 120 mm in width were measured. The authors were engaged to undertake a review of the geotechnical characteristics of the crossings and comment on the construction method employed by the contractor. This paper outlines the conditions encountered, discusses the analytical methods used to calculate movements of the mains and effective depth of rockfill and compares the results with the measured values. It is found that rockfilling for foundation strengthening was unsuitable for this site.
