Effect of Pore Fluid Salinity on Compressibility and Shear Strength Development of Clayey Soils

Smith-Pardo, J. Paul; Sözen, Mete A.; Ramírez, Julio A.

doi:10.1007/978-3-540-39918-6_39

Cited by 14 publications

(10 citation statements)

References 4 publications

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“…Indeed, organic elements cause water retention (Mustin, 1987) whereas salts reduce the plasticity of materials, containing swelling clays (Van Paassen, 2002). Indeed, organic elements cause water retention (Mustin, 1987) whereas salts reduce the plasticity of materials, containing swelling clays (Van Paassen, 2002).…”

Section: Methodology Of Studymentioning

confidence: 99%

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Fine sediments as a granular source for civil engineering

Dubois

Zentar

Abriak

et al. 2011

European Journal of Environmental and Civil Engineering

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Across the world, every year, several millions of tons of sediments are dredged in harbours. These sediments, which are sometimes polluted, represent an interesting granular resource for the civil engineering. For this study, fine sediments are chosen because of the difficulties to evacuate them after dredging, in comparison to sands, induced by their high water content, the presence of organic matters, their mechanical behaviour and, in some cases, the presence of pollutants. The paper shows the study carried out with fine sediments from harbours of the north of France. The authors propose recommendations to optimize the re-use of these sediments in considering technical, environmental and economical criteria. A re-use process has been studied in laboratory and tested on field site. RÉSUMÉ. Dans le monde, chaque année, plusieurs millions de tonnes de sédiments sont dragués dans les ports. Ces sédiments, parfois pollués, peuvent représenter une ressource granulaire intéressante pour le génie civil. Pour cette étude, les sédiments fins sont préférés aux sables car la grande teneur en eau de ces matériaux fins, la présence de matières organiques, leur comportement mécanique et, dans certains cas, la présence de polluants les rendent difficiles à réutiliser après dragage. L'article présente l'étude réalisée avec des sédiments fins du nord de la France. Les auteurs proposent des solutions pour optimiser la réutilisation de ces sédiments en considérant des critères techniques, environnementaux et économiques. Un procédé de réutilisation a été étudié en laboratoire et testé dans le cadre de la réalisation d'une planche expérimentale.

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Section: Methodology Of Studymentioning

confidence: 99%

“…Sediments contain some salt and organic matters, which can influence the values of the Atterberg limits (Van Paassen, 2002). For salt, the Na + and K + ions can skip between the leaves of swelling clay, as montmorrillonite, and increase the bonding between these leaves (Van Paassen, 2002).…”

Section: Table 6 Atterberg Limits Of the Studied Sedimentsmentioning

confidence: 99%

Fine sediments as a granular source for civil engineering

Dubois

Zentar

Abriak

et al. 2011

European Journal of Environmental and Civil Engineering

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“…However, unlike that of most natural clays, particularly soft clay, the compression behaviour of the metal-rich clay is not asymptotic to that of the parent clay, and the reduction of the influence of soil structure with loading is not seen in the experimental observation. Based on quantitative analyses of soil test results [e.g., 3,5,10,11,43,47,48], a special form of Eq. 3is proposed for metal-rich clays as follows:…”

Section: A Dsc Compression Model For Metal-rich Claysmentioning

confidence: 99%

Estimating the compression behaviour of metal-rich clays via a Disturbed State Concept (DSC) model

Fan

Liu

et al. 2016

Applied Clay Science

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Many studies have been made on the compression behaviour of clay exposed to metal-rich liquids (metalrich clay) because metal contamination of clay is found worldwide and increasingly poses as an environmental risk. However, the study on predicting the compression behaviour of contaminated clay with various metal concentrations is very limited. In this paper, a general compression model of the metalrich clays is proposed based on a general Disturbed State Concept (DSC) compression model. A simplified form of the general model is proposed, and validated based on the compression behaviour of metal-rich clays with various metal concentrations in the pore liquid. The following conclusions are obtained in this study: (1) the simplified DSC compression model provides a practical means to estimate the compression behaviour of metal-rich clays, and it can quantify the influence of various metals on the compression behaviour of clay; (2) in the simplified DSC compression model, the influence of metal exposure can be reliably described by one parameter b, which is very useful for geotechnical engineering practice; (3) the ratio of the bulk modulus for metal-rich clays over that of the parent clay (i.e., without metal contamination) is found to be dependent on parameter b only, and that value is usually greater than 1. The highest value for the bulk modulus ratio found in this study is 2.2 for a sea water-exposed clay; and (4) two empirical equations for estimating parameter b are established. Hence the proposed model can be used for engineering estimation.

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“…Singh and Ali (1978) studied the effects of adding up to 5% sodium chloride to a soilaggregate mixture in which the predominant clay mineral was montmorillonite, and they reported an increase in dry density, a reduction in rate of loss of moisture content, and an increase in California bearing ratio (CBR) values. Van Paassen and Gareau (2004) reported an increase of compressibility and undrained shear strength for remoulded clays, by increasing the pore fluids' salinity using three different salt types: sodium chloride, potassium chloride and calcium chloride. Ramana Murty and Hari Krishna (2006) treated expansive soils with calcium chloride and observed that the PI and the swelling pressure decreased considerably after the addition of the salt.…”

Section: Introductionmentioning

confidence: 99%

Modification of clay adhesion to improve tunnelling excavation

Spagnoli

Feinendegen

Rubinos

2013

Proceedings of the Institution of Civil Engineers - Ground Impr

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Mechanical tunnel driving by means of tunnel boring machines through clayey soils often leads to clogging problems which cause delays in tunnel construction and economic issues. Taking into account the diffuse double-layer theory, two very well-known clay formations, namely the Ypresian and Boom clays were investigated. Several geotechnical tests and a new adhesion test (cone pull-out test) were performed using water and solutions with different sodium chloride concentration as pore fluids. The results showed a reduction of the liquid limit for both clays when salt solutions were used instead of water. Undrained shear strength of the Ypresian clay progressively increased as the sodium chloride concentration of the pore fluid increased, whereas that of the Boom clay, which contains less smectite, was less sensitive to the chemical composition of the pore fluids. Cone pull-out tests, developed to detect the adhesive properties of clays, showed a drastic drop of clogging for the Ypresian clay when mixed with sodium chloride solutions within the entire consistency range studied, whereas in the case of Boom clay the variation was less evident and a clear effect was only observed at low consistencies. The results are promising for improving tunnelling excavation performance by adding sodium chloride solutions to avoid problems derived from adhesion of clayey soils.

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Effect of Pore Fluid Salinity on Compressibility and Shear Strength Development of Clayey Soils

Cited by 14 publications

References 4 publications

Fine sediments as a granular source for civil engineering

Fine sediments as a granular source for civil engineering

Estimating the compression behaviour of metal-rich clays via a Disturbed State Concept (DSC) model

Modification of clay adhesion to improve tunnelling excavation

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