Excess pore pressure redistribution beneath pipelines: FEA investigation and effects on axial pipe-soil interaction

Carneiro, D., White, D.J., Danziger, F.A.B. and Ellwanger, G.B. (2015) Excess pore pressure redistribution beneath pipelines: FEA investigation and effects on axial pipe-soil interaction. Meyer, Vaughan (ed.) In Frontiers in Offshore Geotechnics III - Proceedings of the 3rd International Symposium on Frontiers in Offshore Geotechnics, ISFOG 2015. CRC Press / Balkema. pp. 369-374 .

Abstract

Thermal expansion of seabed pipelinesmay generate excess pore pressure in the surrounding soil. This paper discusses aspects of the excess pore pressure redistribution process and their effects on the effective stresses at pipe-soil interface, and the resulting soil resistance to pipeline axial movement. The discussion is supported by results of finite element analyses using coupled soil models, which allow pore pressure generation, redistribution and dissipation. A first model provides insight into the two-dimensionality of the redistribution process, illustrating why dissipation rates differ from one-dimensional consolidation processes.A second model is used to addresses the effect of (apparent) over-consolidation local to the pipe-soil interface. This provides a plausible explanation for the observation in model tests of positive excess pore pressure in initially dilatant soil at the pipe interface.

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Contributors

Author: D.J. White

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