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Watson, Phillip
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (4/4 displayed)
- 2023Increasing confidence in the prediction of axial friction factors for offshore pipelines and cables
- 2021Measurements of long-term strength changes due to cyclic loading in Gulf of Mexico clay
- 2020Effect of water entrainment on seabed soils during cyclic pipe-soil interaction
- 2020On the behaviour of pipe-clamping mattresses to arrest pipeline walking
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document
Effect of water entrainment on seabed soils during cyclic pipe-soil interaction
Abstract
This paper describes a series of experiments to investigate the effects of water entrainment in soil around and beneath oscillating cylinders at the seabed. This knowledge is important in order to predict the as-laid embedment of pipelines laid on the seabed, and to model how risers and chains interact with the seabed during their design life. The experiments consist of harmonic vertical oscillation of a circular pipe section into and out of model seabeds of self weight consolidated clay, followed by immediate measurements of the undrained soil strength with mini T-bar testing and water content in the pipe footprint. The paper confirms that water entrainment can increase the soil sensitivity significantly compared to the fully remoulded strength measured without water entrainment (i.e. that of a non-surface-breakaway T-barcyclic test), and discusses the potential of using these findings to form a soil mechanics-based framework to predict the effects of water entrainment on the strength of soil around offshore infrastructure.