Near-trapping effect of wave-cylinders interaction on pore water pressure and liquefaction around a cylinder array. (15th December 2020)

• Record Type: Journal Article
• Authors: Lin, Zaibin; Pokrajac, Dubravka; Guo, Yakun; Liao, Chencong; Tang, Tian
• Is Part Of: Ocean engineering. Volume 218(2020)
• Publication Date: 2020-12-15
• Subjects: Wave-structure-seabed interaction (WSSI) -- Seabed response -- Four-cylinder foundation -- Near-trapping phenomenon -- Momentary liquefaction; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2020.108047
• Languages: English
• ISSNs: 0029-8018

Abstract

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. Highlights: Near-trapping phenomenon was numerically simulated with good agreement against experimental data. Wave-induced pore water pressure and momentary liquefaction are significantly amplified under the near-trapping effect. Near-trapping effects lead to greater liquefaction depth for 0° than those of 45° heading wave and a mono-pile cases.