PORE-PRESSURE DISSIPATION DURING OFFSHORE CYCLIC LOADING

For cohesionless seafloor soils, the magnitude of pore pressures have a significant influence on design. As effective stresses control stiffness and strength characteristics for cohesionless soils, the rate of dissipation of pore pressures induced by cyclic loading will have a major influence on foundation deformations and seafloor stability. Four problems are examined: (1) Freefield earthquake response; (2) lateral soil-pile interaction; (3) wave loading of offshore gravity structures; and (4) wave induced seafloor pore-pressure response. Both published examples and new analytical solutions are used to show that significant pore-pressure dissipation may occur in many field loading problems, the extent of dissipation depending on induced pore-pressure gradients, the permeability of the soil, and the frequency of loading. (ASCE)

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  • Accession Number: 00322655
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 15706
  • Files: TRIS
  • Created Date: Mar 12 1981 12:00AM