Discovery - University of Dundee - Online Publications

Library & Learning Centre

An experimental study of seabed responses around a marine pipeline under wave and current conditions

An experimental study of seabed responses around a marine pipeline under wave and current conditions

Research output: Contribution to journalArticle

View graph of relations

Authors

  • Chunyan Zhou
  • Guangxue Li
  • Ping Dong
  • Jinghao Shi
  • Jishang Xu

Research units

Info

Original languageEnglish
Pages226-234
Number of pages9
JournalOcean Engineering
Journal publication dateJan 2011
Journal number1
Volume38
DOIs
StatePublished

Abstract

Experiments on three types of soil (d(50) = 0.287, 0.057 and 0.034 mm) with pipeline(D = 4 cm) either half buried or resting on the seabed under regular wave or combined with current actions were conducted in a large wave flume to investigate characteristics of soil responses. The pore pressures were measured through the soil depth and across the pipeline. When pipeline is present the measured pore pressures in sandy soil nearby the pipeline deviate considerably from that predicted by the poro-elasticity theory. The buried pipeline seems to provide a degree of resistance to soil liquefaction in the two finer soil seabeds. In the silt bed, a negative power relationship was found between maximum values of excess pore pressure Amy, and test intervals under the same wave conditions due to soil densification and dissipation of the pore pressure. In the case of wave combined with current, pore pressures in sandy soil show slightly decrease with time, whereas in silt soil, the current causes an increase in the excess pore pressure build-up, especially at the deeper depth. Comparing liquefaction depth with scour depth underneath the pipeline indicates that the occurrence of liquefaction is accompanied with larger scour depth under the same pipeline-bed configuration. (C) 2010 Elsevier Ltd. All rights reserved.

Documents

Library & Learning Centre

Contact | Accessibility | Policy