Modelling the failure modes in geobag revetments

Aysha Akter, Martin Crapper, Garry Pender, Grant Wright, W. S. Wong

Research output: Contribution to journalArticlepeer-review

Abstract

In recent years, sand filled geotextile bags (geobags) have been used as a means of long-term riverbank revetment stabilization. However, despite their deployment in a significant number of locations, the failure modes of such structures are not well understood. Three interactions influence the geobag performance, i.e. geobag–geobag, geobag–water flow and geobag–water flow–river bank. The aim of the research reported here is to develop a detailed understanding of the failure mechanisms in a geobag revetment using a discrete element model (DEM) validated by laboratory data. The laboratory measured velocity data were used for preparing a mapped velocity field for a coupled DEM simulation of geobag revetment failure. The validated DEM model could identify well the critical bag location in varying water depths. Toe scour, one of the major instability factors in revetments, and its influence on the bottom-most layer of the bags were also reasonably represented in this DEM model. It is envisaged that the use of a DEM model will provide more details on geobag revetment performance in riverbanks.
Original languageEnglish
Pages (from-to)418-425
Number of pages8
JournalWater Science and Technology
Volume65
Issue number3
DOIs
Publication statusPublished - 2012

Keywords

  • DEM
  • failure modes
  • geobags

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  • Heriot Watt University

    Martin Crapper (Member)

    2006 → …

    Activity: Visiting an external institution typesResearch and Teaching at External Organisation

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