CUED Publications database

Uplift resistance of buried pipelines in blocky clay backfill

Wang, J and Haigh, SK and Thusyanthan, NI (2009) Uplift resistance of buried pipelines in blocky clay backfill. Proceedings of the International Offshore and Polar Engineering Conference. pp. 480-487. ISSN 1098-6189

Full text not available from this repository.

Abstract

This paper presents the results from 10 minidrum centrifuge tests conducted at the Schofield Centre, compiled with 4 additional test results from Thusyanthan et al., 2008. All these tests were designed to measure the uplift resistance of a pipeline installed into stiff clay by trenching and backfilling, then uplifted approximately 3 months after installation. All tests were conducted at 1:30 scale using soil obtained from offshore clay samples. Experimental results show that clay blocks remained intact after 3 prototype months of consolidation, and were lifted rather than sheared during pipe pullout. The uplift resistance therefore depends on the weight of the soil cover and the shearing resistance mobilised at the softening contact points between the intact blocks and within the interstitial slurry. Slow drained pullout led to lower resistance than fast pullout, indicating that the drained response is critical for design. The varying scatter shows that peak uplift resistance is very sensitive to the arrangement of the backfill blocks when the cover and pipe diameter are comparable to the block size. Copyright © 2009 by The International Society of Offshore and Polar Engineers (ISOPE).

Item Type: Article
Uncontrolled Keywords: Backfill Centrifuge Clay Drained Pipeline Undrained Uplift
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron job
Date Deposited: 04 Feb 2015 23:03
Last Modified: 05 Feb 2015 07:58
DOI: