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Wet winter pore pressures in railway embankments

Record type: Article

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.

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Citation

Briggs, K.M., Smethurst, J.A., Powrie, W. and O'Brien, A.S. (2013) Wet winter pore pressures in railway embankments Proceedings of the ICE - Geotechnical Engineering, 166, (GE5), pp. 451-465. (doi:10.1680/geng.11.00106).

More information

e-pub ahead of print date: 20 February 2013
Published date: 30 September 2013
Keywords: embankments, weather, groundwater
Organisations: Infrastructure Group, Civil Engineering & the Environment

Identifiers

Local EPrints ID: 175815
URI: http://eprints.soton.ac.uk/id/eprint/175815
ISSN: 1353-2618
PURE UUID: 4e1d74f5-1bca-4d92-8266-0e83597439ce
ORCID for W. Powrie: ORCID iD orcid.org/0000-0002-2271-0826

Catalogue record

Date deposited: 28 Feb 2011 11:19
Last modified: 18 Jul 2017 12:09

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