Compaction behaviour of clay

Research output: Contribution to journalArticle

100 Citations (Scopus)

Abstract

This paper presents an experimental study of the compaction behaviour of non-active clay. One-dimensional static compaction tests were carried out at high and medium water content with matric suction monitoring using Trento high-capacity tensiometers. At lower water contents, a transistor psychrometer was used to measure post-compaction suction. Samples were compacted on the dry side of optimum to cover a wide range of compaction water contents and vertical stresses. Three water content regions were identified in the compaction plane depending on whether post-compaction suction increased, decreased or remained constant as the degree of saturation was increased at constant water content. Hydraulic paths of specimens subjected to loading-unloading cycles at constant water content have clearly shown that post-compaction suction may increase as the degree of saturation increases. This non-intuitive behaviour was demonstrated to be associated with the coupling between mechanical and water retention behaviour. To this end, a coupled mechanical water retention model was formulated. Irreversible one-dimensional mechanical paths were modelled by a boundary surface in the space average skeleton vertical stress, modified suction and void ratio. Irreversible hydraulic 'wetting' paths were modelled by a boundary surface in the space suction, degree of saturation, and void ratio. This study was completed by investigating the pore size distribution of compacted samples through MIP tests.
LanguageEnglish
Pages199-213
Number of pages15
JournalGeotechnique
Volume58
Issue number3
DOIs
Publication statusPublished - 1 Apr 2008

Fingerprint

suction
Water content
compaction
Clay
Compaction
water content
clay
void ratio
saturation
water retention
Psychrometers
Hydraulics
hydraulics
tensiometer
unloading
Unloading
wetting
skeleton
Pore size
Wetting

Keywords

  • laboratory tests
  • partial saturation
  • fabric/structure of soils
  • clays
  • compaction
  • suction

Cite this

Tarantino, Alessandro ; De Col, E. / Compaction behaviour of clay. In: Geotechnique. 2008 ; Vol. 58, No. 3. pp. 199-213.
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Compaction behaviour of clay. / Tarantino, Alessandro; De Col, E.

In: Geotechnique, Vol. 58, No. 3, 01.04.2008, p. 199-213.

Research output: Contribution to journalArticle

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AB - This paper presents an experimental study of the compaction behaviour of non-active clay. One-dimensional static compaction tests were carried out at high and medium water content with matric suction monitoring using Trento high-capacity tensiometers. At lower water contents, a transistor psychrometer was used to measure post-compaction suction. Samples were compacted on the dry side of optimum to cover a wide range of compaction water contents and vertical stresses. Three water content regions were identified in the compaction plane depending on whether post-compaction suction increased, decreased or remained constant as the degree of saturation was increased at constant water content. Hydraulic paths of specimens subjected to loading-unloading cycles at constant water content have clearly shown that post-compaction suction may increase as the degree of saturation increases. This non-intuitive behaviour was demonstrated to be associated with the coupling between mechanical and water retention behaviour. To this end, a coupled mechanical water retention model was formulated. Irreversible one-dimensional mechanical paths were modelled by a boundary surface in the space average skeleton vertical stress, modified suction and void ratio. Irreversible hydraulic 'wetting' paths were modelled by a boundary surface in the space suction, degree of saturation, and void ratio. This study was completed by investigating the pore size distribution of compacted samples through MIP tests.

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