Abstract
Evaluating Uncertainty Associated with Engineering Judgement in Predicting the Lateral Response of Conductors
Highlights
Predicting the cyclic response of soft soils is a significant challenge facing offshore geotechnical engineers
This paper presents the results of a prediction exercise undertaken by the National Geotechnical Centrifuge Facility at the University of Western Australia
The problem chosen is the response of a model conductor in normally consolidated fine-grained soil, subjected to sequences of monotonic and cyclic loading in a centrifuge
Summary
Predicting the cyclic response of soft soils is a significant challenge facing offshore geotechnical engineers. This is notably the case for drilling conductors, whereby modelling soil–conductor cyclic behavior is critical in assessing the fatigue life of a system. Current API RP 2GEO guidelines (API 2014) recommend monotonic p-y curves that are based on the results of pushover testing performed on piles, and it is generally accepted that the recommended p-y curves underpredict lateral stiffness at modest displacement levels, which are the most relevant for conductor fatigue assessment. A monotonic pushover test, up to a displacement of 1 conductor diameter (D); 2. A two-way cyclic test at a displacement amplitude of
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