Location

St. Louis, Missouri

Session Start Date

6-1-1993

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

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Third Conference

Publisher

University of Missouri--Rolla

Publication Date

6-1-1993

Document Version

Final Version

Rights

© 1993 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Jun 1st, 12:00 AM

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.