Pore-Pressure Dissipation During Offshore Cyclic Loading

by Geoffrey R. Martin, (M.ASCE), Assoc.; Fugro, Inc., Long Beach, Calif.,
Chan-Feng Tsai, (A.M.ASCE), Project Engr.; Fugro, Inc., Long Beach, Calif.,
Ignatius Lam, (A.M.ASCE), Project Engr.; Fugro, Inc., Long Beach, Calif.,

Serial Information: Journal of the Geotechnical Engineering Division, 1980, Vol. 106, Issue 9, Pg. 981-996

Document Type: Journal Paper


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.

Subject Headings: Cohesionless soils | Sea floor | Soil pressure | Pore pressure | Cyclic loads | Soil analysis | Permeability (soil) | Effective stress

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