Author(s): Michael H. Davies

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Abstract: In order to develop improved prediction techniques for the scouring around and settlement of coastal structures under wave action, the Hydraulics Laboratory of the National Research Council is undertaking a detailed investigation of the inter-action between sediment transport and soil stability. This paper reviews a series of physical model tests of the wave-induced effective stresses and pore pressure fluctuations in sand beds. These tests were performed at a large scale, sand depths ranged from 0.6 to 1.0 m, with wave frequencies ranging from 1.0 to 0.2 Hz and heights from 0.1 to 0.6 m. Comparisons of measured steady state pore pressure response have been made to analytic prediction techniques. Emphasis is placed on the importance of the nature of the phase lag in the bed in delineating the nature of the seabed response. In general, the poro-elastic seabed response model is found to be a good predictor of pore pressure response. Wave loading was found to cause a build-up in pore pressure in three of the tests. In two of these, the pore pressure rise was sufficient to cause liquefaction of the seabed.

DOI:

Year: 1989