PORE PRESSURE GENERATION.

Major problems with the design of sea structures are caused by the repeated loading effect due to wave action. Cyclic shear stresses with amplitudes far below the undrained strength in monotonic loading tend to develop excess pore pressures, causing a reduction of the stiffness and the residual undrained strength, which may lead to inadmissible displacements or loss of stability. This paper deals with the cyclic loading behavior of cohesionless soils. The mechanism of cyclic loading is discussed on the basis of constitutive parameters which govern the pore pressure generation. Solution methods to boundary value problems are reviewed. Two methods which have been applied in connection with the Oosterschelde caisson tests are briefly described. Refs.