Influence of pore water composition on the compressibility of a Danish high plasticity Paleogene clay during sedimentation

Emil Mejlhede Kinslev*, Ole Hededal, Irene Rocchi, Varvara Zania

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

An iconic challenge in geotechnical engineering is the inability to control soil properties at construction sites. To overcome this, several efforts for soil improvement have previously been investigated. Change of pore water chemistry shows potential in strengthening soft soils, but its effects on deformation properties of stiff clays are less extensively studied. The effects of such methods on a Danish high plasticity Paleogene clay are investigated by comparing sedimentation in four different water environments varying the dominating cation to be either Na+ and K+ , and the total cationic charge by a factor two. At self-weight sedimentation both the charge and cation influenced the end of primary void ratio while the effect of charge disappeared with increased loading. All sedimentations curves position below the reference intrinsic compression line, indicating that reconstitution at 1.5 times the liquid limit does not result in complete destructurization in this soil. Both substituting for K+ and increasing the charge decrease the duration of consolidation. The creep indices are insensitive to the water environment at natural stress levels but exceed previous measurements significantly at self-weight sedimentation.
Original languageEnglish
Title of host publicationProceedings of the 20th International Conference on Soil Mechanics and Geotechnical Engineering, Sydney 2022
Number of pages6
PublisherInternational Society for Soil Mechanics and Geotechnical Engineering
Publication date2022
Article number1305
Publication statusPublished - 2022
Event20th International Conference on Soil Mechanics and Geotechnical Engineering - International Convention Centre, Sydney, Australia
Duration: 1 May 20225 May 2022
Conference number: 20

Conference

Conference20th International Conference on Soil Mechanics and Geotechnical Engineering
Number20
LocationInternational Convention Centre
Country/TerritoryAustralia
CitySydney
Period01/05/202205/05/2022

Keywords

  • High plasticity clay
  • Compressibility
  • Sedimentation
  • Soil improvement
  • Pore water chemistry

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