Fine Fissuring of Clay Fill Materials for Flood Defence Embankments

  • Mark Dyer
  • Barnaby Coulsony
Part of the Springer Proceedings in Physics book series (SPPHY, volume 93)


The UK Environment Agency currently maintains over 35,000 km of coastal and flood defence embankments in England and Wales with an annul expenditure of approximately £400m. The majority of the flood defences are earth embankments built from locally available materials using traditional construction methods. Although the performance of the flood defence embankment can be jeopardised by several different failure modes, instability due to the fine;l,,,lay fill has been identified as one of the main causes of failure especially along the eastern coast and Tha dfg mes Estuary. At these locations medium to highly plastic clays are commonly used as fill material. The fine fissuring of these clay fills can reduce the mass permeability of the embankment, leading to a rapid ingress of floodwater with catastrophic collapse of the inward face. As part of a wider research programme into the fine fissuring of clays, preliminary laboratory tests have been carried out into the formation of fissures for a variety of clays with different plasticities. The tests investigated an empirical relationship between the geometry of thin discs of soil with the onset of fissuring for different plastic indices.


Plastic Index Flood Defence Plastic Clay Mass Permeability Preliminary Laboratory 


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  1. Cooling, L.F and Marsland, A. (1954) Soil Mechanics of Failures in the Sea Defence Banks of Essex and Kent, ICE Conference on the North Sea Floods of 31 January / 1 February 1953Google Scholar
  2. Coulson B. 2003 The effect of fine fissuring of clay on the stability of flood defence embankments. MEng Final Year Report, University of DurhamGoogle Scholar
  3. Dyer MR and Gardener (1996). Geotechnical Performance of Flood Defence Embankments. Environment Agency R&D Technical Report W35.Google Scholar
  4. Marsland, A. (1968) The shrinkage and fissuring of clay in flood banks. Note No. IN 39/68, Building Research StationGoogle Scholar
  5. Marsland, A. and Cooling L.F. (1958) Tests on Full Scale Clay Flood Bank to Study Seepage and the Effects of Overtopping, Building Research StationGoogle Scholar
  6. Morris, P.H., Graham, J., and Williams, D.J. (1992). “Cracking in drying soils.” Canadian Geotechnical Journal, Vol 29, pp. 263–277Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • Mark Dyer
    • 1
  • Barnaby Coulsony
    • 1
  1. 1.School of EngineeringUniversity of DurhamUK

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