Numerical investigation of caisson with pad-eye stiffener installation into nonhomogeneous clay
MetadataShow full item record
Caisson foundations are widely used in offshore engineering. During installation, the soil flow mechanism of stiffened caissons with local thickening at the pad-eye is still not well understood. In this study, large deformation finite element (LDFE) model is established to investigate the penetration behavior of caisson with pad-eye stiffener, where the soil flow mechanism is studied considering soil strain softening effect. The numerical model is validated by comparing with available testing data. Parametric study is then conducted to examine potential influencing factors, including the penetration depth, the geometry of stiffener, the clay shear strength, and strain softening parameters. It is found that the soil failure mechanisms and the corresponding penetration resistances of locally stiffened caisson at the pad-eye are significantly different from that of unstiffened caisson or stiffened caisson with interval rings. Two parameters, i.e. the critical rotational soil flow depth (Hr) and the limiting cavity depth (Hc) are introduced to quantitatively describe the behavior of the observed soil flow mechanisms. Based on the modeling results, a simplified flow mechanism is proposed, and approximating expressions are derived to predict the penetration resistance of the caisson for engineering design application.
Showing items related by title, author, creator and subject.
Zhou, Shujin; Zhou, Mi; Zhang, Xihong ; Tian, Qinghui (2021)Accurately predict the resistance of caisson penetrating in stratified soil deposits is an engineering challenge for application of such foundation system. This paper performs large deformation finite element analysis to ...
Hossain, Muhammad Shazzad (2004)Mobile jack-up rigs are widely used in offshore oil and gas exploration and increasingly in temporary production and maintenance work. There is a steadily increasing demand for their use in deeper water and harsher ...
Installation Constraints of Suction Assisted Foundations and Anchors for Offshore Energy DevelopmentRezagholilou, Ali; Akeme, K.; Banimahd, Meysam (2018)The application of suction caissons has increased over the last two decades for offshore energy developments. Their installation challenges in different seabed types affect their execution process and load-bearing capacity. ...