Design and Installation of the Valhall Piggyback Structures

Alm, Torstein; Snell, R.O.; Hampson, Kevin M.; Olaussen, Arne

doi:10.4043/16294-ms

Cited by 9 publications

(1 citation statement)

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“…It was reported that the major reason for pile collapse was the damage propagation starting from the pile tip. A similar case was observed at Valhall water injection platform where five out of eight skirt piles were damaged during installation [8].…”

Section: Motivationsupporting

confidence: 62%

Numerical evaluation of buckling in steel pipe piles during vibratory installation

Bakroon

Daryaei

Aubram

et al. 2019

Soil Dynamics and Earthquake Engineering

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The buckling of steel pipe piles during installation is numerically studied. Generally, numerical simulation of installation processes is challenging due to large soil deformations. However, by using advanced numerical approaches like Multi-Material Arbitrary Lagrangian-Eulerian (MMALE), such difficulties are mitigated. The Mohr-Coulomb and an elastic-perfectly plastic material model is used for the soil and pile respectively. The pile buckling behavior is verified using analytical solutions. Furthermore, the model is validated by an experiment where a pipe pile is driven into sand using vibratory loading. Several case scenarios, including the effects of heterogeneity in the soil and three imperfection modes (ovality, out-of-straightness, flatness) on the pile buckling are investigated. The numerical model agrees well with the experimental measurements. As a conclusion, when buckling starts, the penetration rate of the pile decreases compared to the non-buckled pile since less energy is dedicated to pile penetration given that it is spent mainly on buckling.

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Section: Motivationsupporting

confidence: 62%