Near-trapping effect of wave-cylinders interaction on pore water pressure and liquefaction around a cylinder array

Lin, Z, Pokrajac, D, Guo, Y, Liao, C and Tang, T (2020) Near-trapping effect of wave-cylinders interaction on pore water pressure and liquefaction around a cylinder array. Ocean Engineering, 218. ISSN 0029-8018

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Abstract

The near-trapping effects on wave-induced dynamic seabed response and liquefaction close to a multi-cylinder foundation in storm wave conditions are examined. Momentary liquefaction near multi-cylinder structures is simulated using an integrated wave-structure-seabed interaction model. The proposed model is firstly validated for the case of interaction of wave and a four-cylinder structure, with a good agreement with available experimental measurements. The validated model is then applied to investigate the seabed response around a four-cylinder structure at 0° and 45° incident angles. The comparison of liquefaction potential around individual cylinders in an array shows that downstream cylinder is well protected from liquefaction by upstream cylinders. For a range of incident wave parameters, the comparison with the results for a single pile shows the amplification of pressure within the seabed induced by progressive wave. This phenomenon is similar to the near-trapping phenomenon of free surface elevation within a cylinder array.