Numerical Modeling of Composite Load-Induced Seabed Response around a Suction Anchor

Numerical Modeling of Composite Load-Induced Seabed Response around a Suction Anchor Jingyao Ma School of Engineering & Built Environment, Griffith University Gold Coast Campus, Southport, QLD 4222, Australia http://orcid.org/0009-0008-1226-0092 Hongyi Zhao College of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China http://orcid.org/0000-0001-8087-4792 Dong-Sheng Jeng School of Engineering & Built Environment, Griffith University Gold Coast Campus, Southport, QLD 4222, Australia College of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China http://orcid.org/0000-0003-0199-0918

Suction anchors play a crucial role as marine supporting infrastructure within mooring systems. In engineering practice, the composite load comprising nonlinear waves and cyclic pull-out loads can have adverse effects on the seabed soil, posing a threat to the pull-out bearing capacity of the suction anchor. While existing research predominantly focuses on cyclic pull-out loads, the influence of nonlinear wave actions at the seabed surface remains overlooked. This study employs a two-dimensional integrated numerical model to investigate the dynamic soil response around a suction anchor under the influence of both nonlinear waves and cyclic pull-out loads, focusing on the mechanisms that lead to liquefaction and the deterioration of the interfacial friction due to the excess pore pressure buildup. The numerical results reveal that the cyclic pull-out load is the primary factor in the deterioration of the frictional resistance at the suction–soil interface, especially when the pull-out load is inclined with the suction anchor. Parametric studies indicate that the relative difference in frictional resistance deterioration between cases considering and excluding surface water waves becomes more pronounced in soils characterized by a small consolidation coefficient (Cv) and relative density (Dr).
01 19 2024 189 jmse12010189 National Natural Science Foundation of China http://dx.doi.org/10.13039/ 52271281 Griffith University International Postgraduate Research Scholarship http://dx.doi.org/10.13039/ Griffith University Postgraduate Research Scholarship http://dx.doi.org/10.13039/ https://creativecommons.org/licenses/by/4.0/ 10.3390/jmse12010189 https://www.mdpi.com/2077-1312/12/1/189 https://www.mdpi.com/2077-1312/12/1/189/pdf Barari Insight into the lateral response of offshore shallow foundations Ocean Eng. 2017 10.1016/j.oceaneng.2017.08.012 144 203 Guo Failure mode and capacity of suction caisson under inclined short-term static and one-way cyclic loadings Mar. Georesour. Geotechnol. 2017 10.1080/1064119X.2017.1279244 36 52 Andersen Bearing capacity for foundations with cyclic loads J. Geotech. Eng. 1988 10.1061/(ASCE)0733-9410(1988)114:5(540) 114 540 Chen Uplift Capacity of Suction Caissons under Sustained and Cyclic Loading in Soft Clay J. Geotech. Geoenviron. 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