Wet winter pore pressures in railway embankments

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), 451-465. (doi:10.1680/geng.11.00106).


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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.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1680/geng.11.00106
ISSNs: 1353-2618 (print)
1751-8563 (electronic)
Keywords: embankments, weather, groundwater
Subjects: Q Science > QC Physics
T Technology > TF Railroad engineering and operation
Divisions : University Structure - Pre August 2011 > School of Civil Engineering and the Environment
Faculty of Engineering and the Environment > Civil, Maritime and Environmental Engineering and Science > Infrastructure Research Group
ePrint ID: 175815
Accepted Date and Publication Date:
2013In press
20 February 2013Made publicly available
30 September 2013Published
Date Deposited: 28 Feb 2011 11:19
Last Modified: 31 Mar 2016 13:33
URI: http://eprints.soton.ac.uk/id/eprint/175815

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