An experimental study on the compaction and collapsible behaviour of a flood defence embankment fill

Grainne El Mountassir, Marcelo Sanchez, Enrique Romero

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

With renewed interest in the performance of flood embankments globally, it is important that the performance of fills in conditions similar to ‘as-constructed’ are scrutinised. The fill material investigated in this study was sampled from flood embankments located along the Bengawan Solo River in East Java, Indonesia. The recurrent history of overtopping and stability issues in these embankments provided the motivation for developing a better understanding of the behaviour of this compacted fill under different loading and wetting conditions. The site investigation revealed that the embankment fill was compacted at low dry densities and that there was local variation in the dry densities determined. A detailed study highlighted that at low compactive efforts this fill material exhibits an irregular double-peak compaction curve, which can be explained by the tendency of this fill to form aggregates on wetting. To cover different plausible operational conditions of these embankments, saturated and unsaturated compression oedometer tests and one-dimensional collapse tests were performed under different initial conditions. Specimens compacted at conditions similar to ‘as-constructed’ exhibited significant collapse deformation (up to 13.6%) on wetting. Evolution of the microstructure during loading and wetting paths was investigated using MIP and ESEM. A physically-based framework proposed by Romero (2013) was used to explain the changes in the macroscale collapse behaviour observed in the oedometer tests based on the evolution of microporosity. Using this model the evolution of the microporosity with dry density and water content was presented. This microstructural approach could be used as a tool for specifying appropriate compaction conditions for earthworks where fill material is susceptible to volumetric collapse.
LanguageEnglish
Pages132-145
Number of pages14
JournalEngineering Geology
Volume179
Early online date6 Jul 2014
DOIs
Publication statusPublished - 4 Sep 2014

Fingerprint

Embankments
embankment
compaction
Compaction
fill
experimental study
Wetting
wetting
dry density
Microporosity
oedometer test
earthworks
overtopping
Density (specific gravity)
Water content
site investigation
Rivers
defence
microstructure
water content

Keywords

  • flood embankments
  • laboratory tests
  • irregular compaction curve
  • volumetric collapse

Cite this

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abstract = "With renewed interest in the performance of flood embankments globally, it is important that the performance of fills in conditions similar to ‘as-constructed’ are scrutinised. The fill material investigated in this study was sampled from flood embankments located along the Bengawan Solo River in East Java, Indonesia. The recurrent history of overtopping and stability issues in these embankments provided the motivation for developing a better understanding of the behaviour of this compacted fill under different loading and wetting conditions. The site investigation revealed that the embankment fill was compacted at low dry densities and that there was local variation in the dry densities determined. A detailed study highlighted that at low compactive efforts this fill material exhibits an irregular double-peak compaction curve, which can be explained by the tendency of this fill to form aggregates on wetting. To cover different plausible operational conditions of these embankments, saturated and unsaturated compression oedometer tests and one-dimensional collapse tests were performed under different initial conditions. Specimens compacted at conditions similar to ‘as-constructed’ exhibited significant collapse deformation (up to 13.6{\%}) on wetting. Evolution of the microstructure during loading and wetting paths was investigated using MIP and ESEM. A physically-based framework proposed by Romero (2013) was used to explain the changes in the macroscale collapse behaviour observed in the oedometer tests based on the evolution of microporosity. Using this model the evolution of the microporosity with dry density and water content was presented. This microstructural approach could be used as a tool for specifying appropriate compaction conditions for earthworks where fill material is susceptible to volumetric collapse.",
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An experimental study on the compaction and collapsible behaviour of a flood defence embankment fill. / El Mountassir, Grainne; Sanchez, Marcelo; Romero, Enrique.

In: Engineering Geology, Vol. 179, 04.09.2014, p. 132-145.

Research output: Contribution to journalArticle

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