Consolidation of unsaturated seabed around an inserted pile foundation. and its effects on the wave-induced momentary liquefaction

OCEAN ENGINEERING

卷:131

Article

Sui, Titi^1,2  Zheng, Jinhai^1,2  Zhang, Chi^1,2  Jeng, Dong-Sheng³  Zhang, Jisheng^1,2  Guo, Yakun^1,4  He, Rui^1,2 

[1] Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing, Jiangsu, Peoples R China

[2] Hohai Univ, Coll Harbour Coastal & Offshore Engn, Nanjing, Jiangsu, Peoples R China

[3] Griffith Univ, Cities Res Ctr, Griffith Sch Engn, Gold Coast Campus, Nathan, Qld 4111, Australia

[4] Univ Bradford, Sch Engn, Bradford BD7 1DP, W Yorkshire, England

关键词: Seabed consolidation;    Pile foundation;    External loading;    Wave;    Momentary liquefaction;   

DOI  :  10.1016/j.oceaneng.2016.10.019

来源: Elsevier

【 摘 要 】

Seabed consolidation state is one of important factors for evaluating the foundation stability of the marine structures. Most previous studies focused on the seabed consolidation around breakwaters standing on the seabed surface. In this study, a numerical model, based on Biot's poro-elasticity theory, is developed to investigate the unsaturated seabed consolidation around a nearshore pile foundation, in which the pile inserted depth leads to a different stress distribution. Seabed instabilities of shear failure by the pile self-weight and the potential liquefaction under the dynamic wave loading are also examined. Results indicate that (1) the presence of the inserted pile foundation increases the effective stresses below the foundation, while increases and decreases the effective stresses around the pile foundation for small (de/R < =3.3) and large (de/R > 3.3) inserted depths, respectively, after seabed consolidation, (2) the aforementioned effects are relatively more significant for small inserted depth, large external loading, and small Young's modulus, (3) the shear failure mainly occurs around the inserted pile foundation, rather than below the foundation as previously found for the located marine structures, and (4) wave-induced momentary liquefaction near the inserted pile foundation significantly increases with the increase of inserted depth, due to the change of seabed consolidation state.

【 授权许可】

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