Theoretical method to calculate pipeline thermal transient-induced walking rate considering nonlinear time-dependent soil resistance. Issue 6 (3rd June 2021)

• Record Type: Journal Article
• Authors: Hong, Zhaohui; Xu, Binbin; Liu, Wenbin
• Is Part Of: Marine georesources & geotechnology. Volume 39:Issue 6(2021)
• Page Start: 696
• Page End: 708
• Publication Date: 2021-06-03
• Subjects: Deep-water pipeline -- pipeline walking -- time-dependent soil resistance -- theoretical method; thermal transient-induced walking; Marine mineral resources -- Periodicals; 551.46
• DOI: 10.1080/1064119X.2020.1749739
• Languages: English
• ISSNs: 1064-119X

Abstract

Abstract: Submarine pipeline was widely used to transport oil and gas in offshore petroleum exploitation. In practice, deep-water pipeline experiences several times of maintenance every year. This periodic open-up and shut-down operation causes cyclic rise and fall in the temperature of a pipeline, resulting in the periodic expansion and contraction of the pipeline. Due to the characteristics of heating-up operation, the expansion and contraction movement are symmetrical about different points, and it leads to the pipeline walking phenomenon. As a key factor, the axial soil resistance affects the walking displacement heavily. The shearing generated by expansion and contraction of a pipeline section causes intermitted consolidation of soil and cyclic increment in the equivalent soil resistance coefficient. This paper analysed pipeline walking of a free-end pipeline laid on even seabed with consideration of cyclic soil strength hardening. New driving mechanism for pipeline walking caused by thermal transient due to the influence of time-dependent soil resistance was proposed. A common theoretical method to calculate walking displacement was also established.