A new approximation for pore pressure accumulation in marine sediment due to water waves

• Published in: International Journal for Numerical and Analytical Methods in Geomechanics
• Main Authors: Jeng, D. -S., Seymour, B. R., Li, J.
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2007
• Subjects: Pore pressure accumulation; Shear stress; Cyclic loading; Liquefaction; Arctic
• Online Access: https://discovery.dundee.ac.uk/en/publications/b8a3bb02-33b6-4878-8658-8da47aa89c4b; https://doi.org/10.1002/nag.547

The residual mechanism of wave-induced pore water pressure accumulation in marine sediments is re-examined. An analytical approximation is derived using a linear relation for pore pressure generation in cyclic loading, and mistakes in previous solutions (Int. J. Numer. Anal. Methods Geomech. 2001; 25:885–907; J. Offshore Mech. Arctic Eng. (ASME) 1989; 111(1):1–11) 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 (Laboratory and field investigation of wave– sediment interaction. Joseph H. Defrees Hydraulics Laboratory, School of Civil and Environmental Engineering, Cornell University, Ithaca, NY, 1983), and provide a better prediction of pore pressure accumulation than the previous solution (J. Offshore Mech. Arctic Eng. (ASME) 1989; 111(1):1–11). 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.