Numerical investigation on the pullout capacity of suction caissons in silty sand-over-clay deposit

This study conducts a thorough numerical analysis on the pullout capacity of suction caissons in sand-over-clay deposits. A validated finite element (FE) model is used and verified against available centrifuge experiments and numerical results. A parametric analysis is then performed to investigate the factors influencing the suction caisson’s pullout capacity, including caisson’s length, pad-eye position, and layered deposits. The FE outcomes provide insights into the following key design components: (i) the optimal pad-eye locations; (ii) the ultimate horizontal and vertical bearing capacities; and (iii) the horizontal load estimation at various pad-eyes attachments. A straightforward guideline for calculating the caisson’s pullout capacities is then established for preliminary estimations for suction caissons in silty sand-over-clay deposit.