New design equation for undrained pullout capacity of suction caissons considering combined effects of caisson aspect ratio, adhesion factor at interface, and linearly increasing strength

作者：Ukritchon Boonchai^*; Wongtoythong Panuvat; Keawsawasvong Suraparb

来源：Applied Ocean Research, 2018, 75: 1-14.

DOI：10.1016/j.apor.2018.03.007

• Skirted foundations
• Suction caissons
• Pullout capacity
• Design equation
• Finite element analysis

Undrained pullout capacity of suction caisson in clays with homogeneous and linearly increasing strengths with depth was investigated by two-dimensional axisymmetric finite element analysis. Effects of the caisson aspect ratios, the complete range of adhesion factors at soil-caisson interface, and the full range of dimensionless strength gradients on the dimensionless pullout factor of suction caissons were comprehensively examined. Based on a nonlinear regression to the derived finite element solutions, a new design equation of the undrained pullout capacity of suction caissons was proposed, considering the practical ranges of caisson aspect ratios, the complete range of adhesion factors at soil-caisson interface, and a general profile of both homogeneous and linearly increasing strengths with depth. The proposed equation was validated through a comparison of existing solutions and published experimental data.

• 出版日期2018-6