Effects of pore water chemistry on the unloading-reloading behaviour of reconstituted clays

Publikation: KonferencebidragPaperForskningpeer review

Both clay mineralogy and pore fluid chemistry play an important role in the assessment of the compression characteristics of clays. Based on a series of 1D oedometer tests, a study was carried out to investigate the influence of pore water chemistry and smectite content on the compression, swelling, reloading and con-solidation behaviour of mixtures of kaolin and sodium bentonite powders with saline pore fluid of varying salinities and cations. This paper presents part of the study with special focus on the effects of pore water chemistry on the 1D deformation behaviour during unloading and reloading. The paper presents the general effects of clay mineralogy and pore fluid salinity on deformation characteristics of clays, emphasis being on the overconsolidated stress regime. A strong influence of smectite content, pore fluid salinity and valance of the cations in the pore fluid was observed on volumetric compression in both virgin state and for overconsolidated conditi-ons. The hysteretic behaviour of clays in unloading-reloading is found to become more pronounced with increa-ing smectite content and decreasing pore fluid salinity. Hence, the findings clearly indicate that the influence of pore water chemistry is strictly governed by the presence of smectite minerals and their diffuse double layer.
OriginalsprogDansk
Udgivelsesår2019
StatusAccepteret/In press - 2019
Begivenhed17th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE) - Conference Centre Harpa, Reykjavik, Island
Varighed: 1 sep. 20196 sep. 2019
https://www.ecsmge-2019.com

Konference

Konference17th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE)
LokationConference Centre Harpa
LandIsland
ByReykjavik
Periode01/09/201906/09/2019
Internetadresse

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