Numerical Investigation of Compensated Suction Caissons in Soft Soil
Numerical Investigation of Compensated Suction Caissons in Soft Soil
A novel suction caisson concept, namely the compensated suction caisson, is investigated to minimize settlement for templates where the settlements are critical. The compensated suction caissons involve the excavation of soil inside the caissons to reduce the net increase in load applied by the foundation to the underlying soft soil. The removal of soil reduces the vertical effective stress in the soil, thus putting it in an overconsolidated state and reducing its compressibility. The subsequent loadings of the foundation will therefore tend to cause less settlement than if no excavation of the soil had been carried out. It has been shown that the use of compensation, via excavation of the soil and embedment of the base slab, can lead to significant reduction in settlement compared to conventional suction caissons. A series of finite element analyses has been conducted to investigate effect of the caisson geometry on the undrained foundation capacity under combined vertical-horizontal-moment loading and the mechanisms occurring at failure. The results show a significant increase in foundation bearing capacity for the compensated suction caissons.
Kamchai Choosrithong; Magnus Todnem
5th International Symposium on Frontiers in Offshore Geotechnics (ISFOG2025)
11 - Suction installed foundations and anchors
https://doi.org/10.53243/ISFOG2025-59
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