Mechanism of wave-induced liquefaction around suction caissons
Amir Moghaddama, Amin Bararib, Alireza Tabarsaa
In the proceedings of: GeoVirtual 2020: 73rd Canadian Geotechnical ConferenceABSTRACT: Excess pore pressure build-up around offshore foundations may threaten the safety of the foundations. Despite the extensive research effort on mechanism of wave-induced liquefaction around gravity-based foundations and monopile foundations in recent years, there is still a lack of knowledge on mechanism of wave-induced liquefaction around suction caissons. In this paper, CycliqCPSP constitutive soil model implemented in OpenSees is adopted to capture the response of sandy seabed around the suction caisson. Biot’s consolidation theory, linear wave theory and the advanced soil model are eventually combined to evaluate the soil response accounting for the hydrodynamic pressure of wave imposed on the seabed surface in the presence of a suction caisson foundation considering the wave-seabed-foundation interaction (WSFI). The results show that occurrence of liquefaction around suction caissons greatly depends on some factors including, initial static stresses, confinement impact of caisson’s skirt, drainage path, hydraulic gradient and contact pressure.
RÉSUMÉ: L'accumulation excessive de pression interstitielle autour des fondations offshore peut menacer la sécurité des fondations. Malgré les efforts de recherche approfondis sur le mécanisme de liquéfaction induite par les vagues autour des fondations gravitaires et des fondations monopiles ces dernières années, il y a encore un manque de connaissances sur le mécanisme de liquéfaction induite par les vagues autour des caissons d'aspiration. Dans cet article, le modèle de sol constitutif CycliqCPSP mis en œuvre dans OpenSees est adopté pour capturer la réponse des fonds marins sablonneux autour du caisson d'aspiration. La théorie de consolidation de Biot, la théorie des vagues linéaires et le modèle de sol avancé sont finalement combinés pour évaluer la réponse du sol tenant compte de la pression hydrodynamique des vagues imposée à la surface du fond marin en présence d'une fondation à caisson aspirant compte tenu de l'interaction vague-fond marin-fondation (WSFI ). Les résultats montrent que l'occurrence de liquéfaction autour des caissons d'aspiration dépend fortement de certains facteurs, notamment les contraintes statiques initiales, l'impact de confinement de la jupe du caisson, le chemin de drainage, le gradient hydraulique et la pression de contact.
Please include this code when submitting a data update: GEO2020_331
Access this article:
Canadian Geotechnical Society members can access to this article, along with all other Canadian Geotechnical Conference proceedings, in the Member Area. Conference proceedings are also available in many libraries.
Cite this article:
Moghaddama, Amir, Bararib, Amin, Tabarsaa, Alireza (2020) Mechanism of wave-induced liquefaction around suction caissons in GEO2020. Ottawa, Ontario: Canadian Geotechnical Society.
@article{Moghaddama_GEO2020_331,
author = {Moghaddama, Amir}, {Bararib, Amin}, {Tabarsaa, Alireza},
title = Mechanism of wave-induced liquefaction around suction caissons ,
year = 2020
}
title = Mechanism of wave-induced liquefaction around suction caissons ,
year = 2020
}