The effects of jack-up installation procedures on spudcan capacity in offshore carbonate sediments

Amodio, Alessandro; Chang, Tianquan; Kong, Vickie; Erbrich, Carl

doi:10.1201/b18442-190

Cited by 4 publications

(2 citation statements)

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“…Through a consolidation period, the recovery of soil strength enhances the soil penetration resistance, which may raise the capacity to an acceptable level that would enhance the range of wave conditions in which the jack-up can safely operate, or may heighten the risk of spudcan punchthrough (e.g. Purwana et al 2005;Bienen and Cassidy 2013;Amodio et al 2015;Wang and Bienen 2016;Ragni et al 2016).…”

Section: Introductionmentioning

confidence: 99%

The changing strength of carbonate silt: parallel penetrometer and foundation tests with cyclic loading and reconsolidation periods

2020

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This paper describes a centrifuge study using novel penetrometer tests (T-bar and piezoball) and model foundation tests to explore through-life changes in the strength of a reconstituted natural carbonate silt. The test procedures include episodic cyclic loading, which involves intervals of pore pressure dissipation between cyclic packets. These loads and the associated remoulding and reconsolidation cause significant changes in the soil strength and foundation capacity. Soil strength changes from penetrometer tests differed by a factor of 15 from the fully remoulded strength to a limiting upper value after long-term cyclic loading and reconsolidation. For the model foundation tests, the foundation capacity of a surface foundation and a deep-embedded plate were studied. The soil strength interpreted from the measured foundation capacity varied by a factor of up to three due to episodes of loading and consolidation, with an associated order of magnitude increase in the coefficient of consolidation. The results show a remarkable rise in soil strength over the loading events, and provide a potential link between changes in soil strength observed in penetrometer tests and the capacity of foundations, allowing the effects of cyclic loading and consolidation to be predicted.

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Section: Introductionmentioning

confidence: 99%

The changing strength of carbonate silt: parallel penetrometer and foundation tests with cyclic loading and reconsolidation periods

2020

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“…For instance, during footing installations for mobile offshore drillings rigs, periods of consolidation under an elevated preload may be introduced deliberately to enhance the subsequent capacity (Amodio et al, 2015), and consolidation during the operational phase also affects the subsequent extraction resistance (Purwana et al, 2005;Kohan et al, 2014Kohan et al, , 2016. Through the consolidation period, the recovery of soil strength enhances the penetration resistance, which may raise the capacity to an acceptable level that would enhance the range of wave conditions in which the jack-up can safely operate.…”

Section: Background and Motivationmentioning

confidence: 99%

An effective stress framework for estimating penetration resistance accounting for changes in soil strength from maintained load, remoulding and reconsolidation

2019

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Some offshore foundations are subjected to intermittent episodes of remoulding and reconsolidation during installation and operational processes. The maintained and cyclic loads, and subsequent reconsolidation processes, cause changes in the geotechnical capacity, particularly in soft clays. This changing capacity affects the in-service behaviour, including changes to the safety margin, the extraction resistance, the stiffness and structural fatigue rates and also the overall system reliability. This paper provides a new analysis framework to capture these effects, based on estimation of the changing soil strength. The framework is developed using critical state concepts in the effective stress domain, and by discretising the soil domain as a one-dimensional column of soil elements. This framework is designed as the simplest basis on which to capture spatially varying changes in strength due to maintained and cyclic loads, and the associated remoulding and reconsolidation processes. The framework can be used to interpret cyclic penetrometer tests, as well as foundation behaviour. This provides a basis for the approach to be used in design, by scaling directly from penetrometer tests to foundation behaviour. Centrifuge tests are used to illustrate the performance of this approach. The penetration resistance during cyclic T-bar penetrometer tests and spudcan footing installation with periods of maintained loading and consolidation is accurately captured. The framework therefore provides a basis to predict the significant changes in penetration resistance caused by changing soil strength, and can bridge between in situ penetrometer tests and design assessments of soil-structure interaction.

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Aspects of soft clay behaviour important for correct prediction of spudcan foundation penetration

Jerman

Maš́ın

Ragni³

et al. 2022

Computers and Geotechnics

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The effects of jack-up installation procedures on spudcan capacity in offshore carbonate sediments

Cited by 4 publications

References 0 publications

The changing strength of carbonate silt: parallel penetrometer and foundation tests with cyclic loading and reconsolidation periods

The changing strength of carbonate silt: parallel penetrometer and foundation tests with cyclic loading and reconsolidation periods

An effective stress framework for estimating penetration resistance accounting for changes in soil strength from maintained load, remoulding and reconsolidation

Aspects of soft clay behaviour important for correct prediction of spudcan foundation penetration

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