Upward Pipe–Soil Interaction for Shallowly Buried Pipelines in Dense Sand
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 144, Issue 11
Abstract
Uplift resistance is a key parameter against upheaval buckling in the design of a buried pipeline. The mobilization of uplift resistance in dense sand is investigated in the present study based on finite-element (FE) analysis. The prepeak hardening, postpeak softening, density-dependent, and confining pressure–dependent soil behavior are implemented in FE analysis. The uplift resistance mobilizes with progressive formation of shear bands. The vertical inclination of the shear band is approximately equal to the maximum dilation angle at the peak and then decreases with upward displacement. The force–displacement curves can be divided into three segments: prepeak, quick postpeak softening, and gradual reduction of resistance at large displacements. Simplified equations are proposed for mobilization of uplift resistance. The results of FE analysis, simplified equations, and model tests are compared. The importance of postpeak degradation of uplift resistance to upheaval buckling is discussed.
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Acknowledgments
The works presented in this paper have been supported by the Research and Development Corporation of Newfoundland and Labrador, Chevron Canada Limited, and the Natural Sciences and Engineering Research Council of Canada (NSERC).
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©2018 American Society of Civil Engineers.
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Received: Apr 17, 2017
Accepted: Apr 26, 2018
Published online: Aug 23, 2018
Published in print: Nov 1, 2018
Discussion open until: Jan 23, 2019
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