Failure probabilities for plastic utility ducts in roadway trench reinstatements.

Hounsome, I W S and Fairfield, Charles A (2001) Failure probabilities for plastic utility ducts in roadway trench reinstatements. Transport, 147 (1). pp. 1-7. ISSN 0965 092X

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Wavin Industrial Products Limited arranged access in conjunction with Balfour Beatty Construction Limited and Bovis Construction Limited to the Braehead construction site, near Glasgow, to test a mixture of smooth bore and corrugated utility ducts in situ . Samples of all ducts were then parallel plate compression tested to BS EN 50086. Results of all site tests are presented with cumulative frequency charts showing the likelihood of a duct failing. Detailed analysis and discussion of the test results from site then follow. Key points arising from the field deformation measurements were: the stiffest ducts performed well; at no point did the vertical diametral strain exceed 5·3%. This indicated both good-quality duct and good-quality installation. Comparisons are drawn with other types of duct and the cumulative frequency plots revealed that duct stiffness played a major role in ensuring satisfactory performance. The vertical diametral strains are categorized with pass/fail decisions attached to each category. This paper casts doubt on the 450 N limiting force at 5% vertical diametral strain; the authors feel it is too low and that 700 kPa is a more suitable minimum specific stiffness. This was supported by a plot of failure probability against average specific stiffness from four different ducts tested in situ over the last five years.

Item Type: Article
Print ISSN: 0965 092X
Electronic ISSN: 1751-7710
Uncontrolled Keywords: Plastic pipes; Underground ducts; Failure; Loading; Stiffness; Parallel plate compression tests;
University Divisions/Research Centres: Faculty of Engineering, Computing and Creative Industries > School of Engineering and the Built Environment
Dewey Decimal Subjects: 600 Technology > 620 Engineering > 620 Engineering & allied operations
600 Technology > 620 Engineering > 624 Civil engineering
Library of Congress Subjects: T Technology > TE Highway engineering. Roads and pavements
T Technology > TA Engineering (General). Civil engineering (General)
Item ID: 1937
Depositing User: RAE Import
Date Deposited: 19 Feb 2008 12:55
Last Modified: 27 Jan 2015 08:52

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