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Particle shape quantities and influence on geotechnical properties: a review
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-6451-7506
2012 (English)Report (Other academic)
Abstract [en]

It has been shown in the early 20th century that particle shape has an influence on geotechnical properties. Even if this is known, there has been only minor progress in explaining the processes behind its performance and has only partly implemented in practical geotechnical analysis.This literature review covers different methods and techniques used to determine the geometrical shape of the particles as well as reported effects of shape on granular material behaviour. Particle shape could be classifying in three categories; sphericity - the overall particle shape and similitude with a sphere, roundness - the description of the particle’s corners and roughness - the surface texture of the particle. The categories are scale dependent and the major scale is to sphericity while the minor belongs to roughness.Empirical relations and standards had been developed to relate soil properties, e.g. internal friction angle, minimum and maximum void ratio, density, permeability, strain, with the particle shape. The use of the relations and standards enhance the bulk material performance e.g. asphalt mixtures and rail road ballast.The overview has shown that there is no agreement on the usage of the descriptors and is not clear which descriptor is the best. One problem has been in a large scale classify shape properties. Image analysis seems according to the review to be a promising tool, it has many advantages. But the resolution in the processed image needs to be considered since it influence descriptors such as e.g. the perimeter.

Abstract [en]

This literature review covers different methods and techniques used to determine the geometrical shape of the particles as well as reported effects of shape on granular material behaviour.Particle shape could be classifying in three categories; sphericity - the overall particle shape and similitude with a sphere, roundness - the description of the particle’s corners and roughness - the surface texture of the particle. The categories are scale dependent and the major scale is to sphericity while the minor belongs to roughness.Empirical relations and standards had been developed to relate soil properties, e.g. internal friction angle, minimum and maximum void ratio, density, permeability, strain, with the particle shape. The use of the relations and standards enhance the bulk material performance e.g. asphalt mixtures and rail road ballast.The overview has shown that there is no agreement on the usage of the descriptors and is not clear which descriptor is the best. One problem has been in a large scale classify shape properties. Image analysis seems according to the review to be a promising tool, it has many advantages. But the resolution in the processed image needs to be considered since it influence descriptors such as e.g. the perimeter.

Place, publisher, year, edition, pages
Luleå, 2012. , 51 p.
Keyword [en]
Civil engineering and architecture - Geoengineering and mining engineering
Keyword [sv]
Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-21789Local ID: 02365788-fa8f-4add-8d62-81f9c40bcc47OAI: oai:DiVA.org:ltu-21789DiVA: diva2:994837
Note
Godkänd; 2012; 20121122 (juarod)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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CiteExportLink to record
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