Measured and calculated spudcan penetration profiles for case histories in sand-over-clay

Muhammad Shazzad Hossain, Pan Hu, Mark Jason Cassidy, David Menzies, Audrey Wingate

Research output: Contribution to journalArticle

Abstract

This paper reports five case histories of jack-up rig installation in layered soil profiles where a dominate feature was a stronger sand layer overlaying a weaker clay layer. In all cases a relatively continuous load-penetration profile was measured during installation of each of the three spudcan foundations. Summary site-investigation data is provided and consisted of mainly torvane, minature vane, unconsolidated undrained triaxial and pocket penetrometer tests for determining undrained shear strength of the clays and blow counts for deriving the relative density of sand. A statistical averaging method recommended in the InSafeJIP guidelines was used to provide the best fit of the undrained shear strength profile in the clay as this then allowed for spudcan load-penetration profiles to be estimated without introduction of user interpretation or bias. Sand properties were taken as provided in the original site-investigation report. Comparisons between load-penetration profiles calculated using the industry-standard ISO guideline, more recently proposed mechanism-based calculation method and three-dimensional large deformation finite element simulations are made with the measured data, leading to valuable insights for practitioners for estimating behaviour of jack-up installations in problematic sand-over-clay soil profiles.

Original languageEnglish
Pages (from-to)447-457
Number of pages11
JournalApplied Ocean Research
Volume82
DOIs
Publication statusPublished - Jan 2019

Cite this

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title = "Measured and calculated spudcan penetration profiles for case histories in sand-over-clay",
abstract = "This paper reports five case histories of jack-up rig installation in layered soil profiles where a dominate feature was a stronger sand layer overlaying a weaker clay layer. In all cases a relatively continuous load-penetration profile was measured during installation of each of the three spudcan foundations. Summary site-investigation data is provided and consisted of mainly torvane, minature vane, unconsolidated undrained triaxial and pocket penetrometer tests for determining undrained shear strength of the clays and blow counts for deriving the relative density of sand. A statistical averaging method recommended in the InSafeJIP guidelines was used to provide the best fit of the undrained shear strength profile in the clay as this then allowed for spudcan load-penetration profiles to be estimated without introduction of user interpretation or bias. Sand properties were taken as provided in the original site-investigation report. Comparisons between load-penetration profiles calculated using the industry-standard ISO guideline, more recently proposed mechanism-based calculation method and three-dimensional large deformation finite element simulations are made with the measured data, leading to valuable insights for practitioners for estimating behaviour of jack-up installations in problematic sand-over-clay soil profiles.",
keywords = "Bearing capacity, Clays, Failure, Footings/foundations, Numerical modelling, Offshore engineering, Sands, BEARING CAPACITY, INTERBEDDED SAND, PUNCH-THROUGH, FOUNDATIONS, INSTALLATION, STRENGTH, MODEL",
author = "Hossain, {Muhammad Shazzad} and Pan Hu and Cassidy, {Mark Jason} and David Menzies and Audrey Wingate",
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Measured and calculated spudcan penetration profiles for case histories in sand-over-clay. / Hossain, Muhammad Shazzad; Hu, Pan; Cassidy, Mark Jason; Menzies, David; Wingate, Audrey.

In: Applied Ocean Research, Vol. 82, 01.2019, p. 447-457.

Research output: Contribution to journalArticle

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