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Penetration Mechanism and Limiting Cavity Depth of Caisson Foundation for Jack-Up in Clay
The adoption of caisson foundations for offshore jack-up rigs is attributed to their capability to prevent punch-through failure and enhance stability during drilling operations. The presence of the caisson wall alters the penetration mechanism, which differs from that of saucer-shaped spudcans, thus affecting the method for calculating the limiting cavity depth and bearing capacity. In this study, the Coupled Eulerian-Lagrangian (CEL) finite element method was employed to conduct large deformation simulations of the entire preload penetration process. The influence of caisson wall length on the penetration mechanism and the limiting cavity depth of caissons was investigated. The analysis of penetration resistance and soil deformation mechanisms surrounding the advancing caisson has revealed a three-stage caisson penetration process: the caisson wall penetration stage, shallow penetration stage, and deep penetration stage. In the wall penetration stage, the penetration resistance originates from internal and external friction resulting from the interaction between the wall and soil. During the shallow penetration stage, soil gradually flows back into the cavity until reaching a stable cavity depth. In the deep penetration stage, a fully localized flow occurs around the embedded caisson, while the cavity remains unchanged. This paper provides a comparative analysis of the cavity depth between caisson and spudcan foundations. Considering the normalized strength formula and the length of the caisson wall, an equation is presented to estimate the limiting cavity depth for caisson foundations in homogeneous clay.
Penetration Mechanism and Limiting Cavity Depth of Caisson Foundation for Jack-Up in Clay
The adoption of caisson foundations for offshore jack-up rigs is attributed to their capability to prevent punch-through failure and enhance stability during drilling operations. The presence of the caisson wall alters the penetration mechanism, which differs from that of saucer-shaped spudcans, thus affecting the method for calculating the limiting cavity depth and bearing capacity. In this study, the Coupled Eulerian-Lagrangian (CEL) finite element method was employed to conduct large deformation simulations of the entire preload penetration process. The influence of caisson wall length on the penetration mechanism and the limiting cavity depth of caissons was investigated. The analysis of penetration resistance and soil deformation mechanisms surrounding the advancing caisson has revealed a three-stage caisson penetration process: the caisson wall penetration stage, shallow penetration stage, and deep penetration stage. In the wall penetration stage, the penetration resistance originates from internal and external friction resulting from the interaction between the wall and soil. During the shallow penetration stage, soil gradually flows back into the cavity until reaching a stable cavity depth. In the deep penetration stage, a fully localized flow occurs around the embedded caisson, while the cavity remains unchanged. This paper provides a comparative analysis of the cavity depth between caisson and spudcan foundations. Considering the normalized strength formula and the length of the caisson wall, an equation is presented to estimate the limiting cavity depth for caisson foundations in homogeneous clay.
Penetration Mechanism and Limiting Cavity Depth of Caisson Foundation for Jack-Up in Clay
Lecture Notes in Civil Engineering
Jeng, Dong-Sheng (editor) / Cai, Baoping (editor) / Wei, Xi (author) / Jia, Ning (author) / Wang, Teng (author)
International conference on coastal and Ocean Engineering ; 2024 ; Shandong, China
Proceedings of 11th International Conference on Coastal and Ocean Engineering ; Chapter: 25 ; 271-280
2025-02-28
10 pages
Article/Chapter (Book)
Electronic Resource
English
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