Propagation of Dynamic Pressure into 1-D Model of Reclaimed Sand behind Caisson-Type Seawalls

The authors derive one dimensional governing equation for the dynamic pore water pressure generated in a horizontally reclaimed sand zone due to the propagation of dynamic pressure to it. The equation's reliability is examined by comparing the solution with the model test results. The comparison focuses on the attenuation and phase delay of dynamic pressure induced during its propagation into the reclaimed sand zone. The comparison reveals that the following two facts predicted by the solution are verified by the results of the model tests: (1) Dynamic pressure exponentially decreases with the propagated distance in the reclaimed sand zone and the attenuation rate is inversely proportional to the square root of the period of the dynamic pressure when the physical properties of both pore water and reclaimed sand are kept constant. (2) Phase delay linearly increases with the propagated of dynamic pressure. The rate of the phase delay is also inversely proportional to the square root of the period of the dynamic pressure when the physical properties of both pore water and reclaimed sand are kept constant.