A series of wave flume experiments are conducted to investigate thewave-induced pore pressure around a trenched pipeline in a silty seabed.The pipeline is half or full buried with three kinds of backfill sand (d_(50)=0.15mm, 0.3mm, 0.5mm), each is coarser than seabed soil (d_(50)=0.04mm). Results show that the buried soil reduces the excess porepressure around pipeline and provides a degree of resistance to seabedliquefaction, and the excess pore pressure around the circumference ofpipeline or beneath the pipeline is larger in the coarser backfill sand, anddecreases with the increase of backfilled depth.
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