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Hydraulic properties of smectite rich clay controlled by hydraulic gradients and filter types
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-6851-4839
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-1365-8552
2014 (English)In: Applied Clay Science, ISSN 0169-1317, E-ISSN 1872-9053, Vol. 87, p. 73-80Article in journal (Refereed) Published
Abstract [en]

The common practice in geotechnical laboratories is to apply high hydraulic gradients for getting results in reasonable time but this can jeopardize the accuracy. In this paper, the hydraulic conductivity of a smectite rich clay from Iraq was determined under different hydraulic gradients (5 to 10000 m/m) using several densities and two permeants. Also, two types of filters were used, ordinary stainless steel sintered filter and sand/silt filter, in order to examine the possible effect of clogging by dragged clay gel particles. It was concluded that the outflow filter can affect the evaluated conductivity especially when applying high hydraulic gradients. For sintered filters the hydraulic conductivity was reduced as the gradient increased, while the conductivity increased as the hydraulic gradient increased when using sand/silt filters. For salt water the impact of the gradient was less obvious than for distilled water. A theoretical model was derived for selecting safe hydraulic gradients as a function of dry density, hydraulic gradient, swelling pressure and permeant type. A major conclusion was that the gradient in laboratory testing should not exceed 100 m/m.

Place, publisher, year, edition, pages
2014. Vol. 87, p. 73-80
Keywords [en]
hydraulic conductivity, , hydraulic gradient, smectite, , clogging, , clay gel, , filter porosity, Civil engineering and architecture - Geoengineering and mining engineering
Keywords [sv]
Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-2765DOI: 10.1016/j.clay.2013.11.027ISI: 000330146600012Scopus ID: 2-s2.0-84890151869Local ID: 072e9320-faac-4c0c-9071-a8a6cebd31e6OAI: oai:DiVA.org:ltu-2765DiVA, id: diva2:975618
Note
Validerad; 2014; 20131120 (laikha)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Al-Taie, LaithPusch, RolandKnutsson, Sven

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