Wet winter pore pressures in railway embankments

Kevin M Briggs, Joel A Smethurst, William Powrie, Anthony S O'Brien

Research output: Contribution to journalArticle

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Abstract

This paper demonstrates the influence of extreme wet winter weather on pore water pressures within clay fill railway embankments, using field monitoring data and numerical modelling. Piezometer readings taken across the London Underground Ltd network following the wet winter of 2000/2001 were examined, and showed occurrences of hydrostatic pore water pressure within embankments but also many readings below this. A correlation was found between the maximum pore water pressures and the permeability of the embankment foundation soil, with high permeability foundation soils (of Chalk or river terrace deposits) providing underdrainage and maintaining low pore water pressures within the overlying clay embankment fill. Numerical modelling of transient water flow in response to a climate boundary condition supports this conclusion and has been used to demonstrate the influence of clay fill and underlying foundation permeability on transient pore water pressures during extreme (c. 1 in 100 year) and intermediate (c. 1 in 10 year) wet winter rainfall. For clay founded embankments, extreme wet winter conditions increased pore water pressures significantly compared with an intermediate winter, while for embankments underlain by a permeable stratum pore water pressures were less sensitive to the extreme winter rainfall.
Original languageEnglish
Pages (from-to)451-465
JournalProceedings of the Institution of Civil Engineers - Geotechnical engineering
Volume166
Issue number5
Early online date1 Feb 2013
DOIs
Publication statusPublished - 20 Feb 2013

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Pore pressure
Embankments
embankment
railway
pore pressure
porewater
winter
Water
Clay
clay
fill
permeability
Rain
rainfall
river terrace
Soils
piezometer
transient flow
chalk
hydrostatics

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Wet winter pore pressures in railway embankments. / Briggs, Kevin M; Smethurst, Joel A; Powrie, William; O'Brien, Anthony S.

In: Proceedings of the Institution of Civil Engineers - Geotechnical engineering, Vol. 166, No. 5, 20.02.2013, p. 451-465.

Research output: Contribution to journalArticle

Briggs, Kevin M ; Smethurst, Joel A ; Powrie, William ; O'Brien, Anthony S. / Wet winter pore pressures in railway embankments. In: Proceedings of the Institution of Civil Engineers - Geotechnical engineering. 2013 ; Vol. 166, No. 5. pp. 451-465.
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