A New Approximation for Pore Pressure Accumulation in Marine Sediment Due to Water Waves (No. R868)

Abstract

The residual mechanism of wave-induced pore water pressure accumulation in marine sediments is re-examined. Analytical approximation is derived using a linear relation fore pore pressure generation in cyclic lading, and mistakes in previous solutions (Cheng, et al., 2001. McDougal, et al., 1989) are corrected. A numerical scheme is then employed to solve the case with a non-linear relation for pore pressure generation. Both analytical and numerical solutions are verified with experimental data (Clukey, st al., 1983), and provide a better prediction of pore pressure accumulation than the previous solution (McDougal, et al., 1989). The parametric study concludes that the pore pressure accumulation and use of full non-linear relation of pore pressure become more important under the following conditions: (1) large wave amplitude, (2) longer wave period, (3) shallow water, (4) shallow soil and, (5) softer soils with a low consolidation coefficient.