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Caisson capacity in undrained soil: failure envelopes with internal scooping

Meyer, V. (ed.), Frontiers in Offshore Geotechnics III: proceedings of the Third International Symposium on Frontiers in Offshore Geotechnics (ISFOG 2015), Oslo, Norway, 10-12 June 2015, CRC Press, Boca Raton, pp. 337-342.

10 Jun 2015
Dijk, B.F.J. van
DOI: 10.1201/b18442-33

This paper presents resistance envelope equations for open-ended caissons, considering failure of the soil inside the caisson (i.e internal scooping). Equations for assessment of failure envelopes of caissons installed in undrained soil were developed by Kay&Palix (2011) for various embedded Length (L) over Diameter (D) ratios and varying undrained shear strength profiles. One of the assumptions in Kay & Palix (2011) is a solid caisson, which implies no possibility of internal scooping failure. 3D finite element software was used to assess equations for VHM failure envelopes for open-ended caissons with various embedment (L/D) ratios in undrained soil with varying undrained shear strength profiles. The assessments show a significant reduction in VHM failure envelopes for caissons with L/D ratios less than 2, that are installed in non-uniform soil conditions. The equations can be used for design purposes.


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