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An experimental study of seabed responses around a marine pipeline under wave and current conditions |
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| Authors: | Chunyan Zhou Guangxue Li Ping Dong Jishang Xu |
| Institution: | a College of Marine Geosciences, Ocean University of China, Qingdao 266100, China b Key Lab of Seafloor Resource and Exploration Technique of Ministry of Education, Qingdao 266100, China c School of Engineering, Physics and Mathematics, University of Dundee, Dundee DD1 4HN, UK |
| Abstract: | Experiments on three types of soil (d50=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 pmax 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. |
| Keywords: | Pore pressure Pipeline Liquefaction Regular wave Current Soil response |
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