Effect of Tension on the Combined Loading Failure Envelope of a Pipeline on Soft Clay Seabed
Publication: International Journal of Geomechanics
Volume 18, Issue 10
Abstract
Offshore pipelines are commonly laid directly on the seabed, which is dominantly soft clayey deposits in deep-water areas. This article presents a numerical finite-element study of the undrained bearing capacity of a pipeline partially embedded in clay soil and subjected to combined vertical (V) and horizontal (H) loading. The effect of tensile capacity between the pipe and soil is considered. Expressions for bearing-capacity envelopes explicitly written in the V–H space and covering a practical range of embedment ratios and uplift tensile capacities are presented. This allows offshore engineers to estimate pipeline behavior under combined loading with consideration of the tension between pipe and soil.
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Acknowledgments
This research was undertaken with support from the Lloyd’s Register Foundation (LRF) and Australian Research Council Discovery Project (DP180103314). LRF, a U.K.-registered charity and sole shareholder of Lloyd’s Register Group Ltd., invests in science, engineering, and technology for public benefit, worldwide. This study comprises part of the activities of the Centre for Offshore Foundation Systems (COFS), currently supported as a node of the Australian Research Council Centre of Excellence for Geotechnical Science and Engineering. The second author would thank the discussion and suggestion from Dr Yan and Prof Zhang (supported by the National Natural Science Foundation of China 51709198, 51574139 and Natural Science Foundation of Tianjin 16JCQNJC07900).
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Published In
International Journal of Geomechanics
Volume 18 • Issue 10 • October 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Jun 6, 2017
Accepted: Apr 10, 2018
Published online: Aug 2, 2018
Published in print: Oct 1, 2018
Discussion open until: Jan 2, 2019
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