SYMPOSIA PAPER Published: 01 January 1986

Deformations and Pore Pressures Beneath Gravity Structures


The paper describes an analytical method for predicting the stresses, displacements, and pore pressures beneath a gravity structure. The analysis is an application of the mechano-lattice technique, which considers linearized loading-unloading stress-strain relationships. It is noted, however, that those equivalent finite-element analyses using the elastic-plastic model or some other appropriate model, such as the model used in the mechano-lattice technique, would be equally applicable.

The basic parameters of the analysis are the loading modulus EL and Poisson's ratio vL, and the unloading modulus EuL and Poisson's ratio vuL. The residual stresses after the passage of a single wave depend on the ratio of EuL to EL, termed the stiffness modulus KR.

In the necessarily simplified procedure the dissipation of pore pressure over the period of the storm was neglected. A superposition procedure was adopted to predict the effects of N waves. An average value of residual strain per cycle obtained from repeated loading triaxial data was used to determine an appropriate value of EuL. The value of EL was considered to be constant.

A comparison was made of the predicted values with corresponding experimental values of displacement and residual pore pressure that were obtained in a model test. Pore pressures developed under cyclic loading were 30% overestimated by the analysis, but the incremental displacements were closely predicted.

Author Information

Lee, IK
The University of New South Wales, Canberra, New South Wales, Australia
Staunton, T
The University of New South Wales, Canberra, New South Wales, Australia
White, W
The University of New South Wales, Canberra, New South Wales, Australia
Yandell, WO
The University of New South Wales, Kensington, New South Wales, Australia
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Developed by Committee: D18
Pages: 295–305
DOI: 10.1520/STP18420S
ISBN-EB: 978-0-8031-4987-8
ISBN-13: 978-0-8031-0490-7