Influence of sand liquefaction on the self-burial of a pipe submitted to wave action
Résumé
Coastal or offshore structures such as pipelines installed on the seabed are subject to cyclic horizontal loads either by direct hydrodynamic wave action or through the cyclic movement of risers or flow lines transmitted by floating structures. In fine sandy or silty soils, such cyclic loads may lead to liquefaction of the surrounding bed, which can play an important part in the processes of erosion, trenching or self-burial of the pipes. A large 1-g physical model was built to study the fluid-soil-structure interaction, with special emphasis placed on the conditions in which liquefaction occurs around a pipe instrumented with pore-pressure transducers. The experiments indicate a strong increase in pore pressure at the pipe-soil interface, and lateral visualization revealed the liquefaction of a soil band in the vicinity of the pipe. The penetration of the structure can be related to the phenomenon of liquefaction.
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