Cyclic triaxial tests and numerical analyses were undertaken, in order to evaluate the wave-induced pore water pressure in seabedsediments in the Hangzhou Bay. The cyclic triaxial tests indicate that the rate of pore water pressure generation in cohesive soilsdecreases with time, and the development of the pore water pressure can be represented by a hyperbolic curve. Numerical analyses,taking into account the generation and dissipation of pore water pressure simultaneously, suggest that the pore water pressure buildupin cohesive soils may increase with time continuously until the pore water pressure ratio approaches to 1, or it may decrease after acertain time, which is controlled by drain conditions. These phenomena are different from those in sands. For waves with a returnperiod of 100 a in the Hangzhou Bay, if the wave duration is more than 60 h, then the pore water pressure ratio will be close to 1 andsoil fabric failure will take place.
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