Analysis of the micro to macro response of clays to compression

An investigation of clay microstructure and its evolution under 1D and isotropic compression is presented for different clays. Data from the literature are compared to original results on two Italian clays, obtained using SEM, image processing, MIP and on-purpose swelling tests. The effects of compo...

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Autores: Guglielmi, S., Cotecchia, Federica, Cafaro, F., Gens Solé, Antonio|||0000-0001-7588-7054
Tipo de recurso: artículo
Fecha de publicación:2023
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/385456
Acceso en línea:https://hdl.handle.net/2117/385456
https://dx.doi.org/10.1680/jgeot.21.00233
Access Level:acceso abierto
Palabra clave:Clay soils -- Testing
Clays
Fabric/structure of soils
Electron microscopy
Porosimetry
Laboratory tests
Sòls argilosos -- Proves
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòls
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spelling Analysis of the micro to macro response of clays to compressionGuglielmi, S.Cotecchia, FedericaCafaro, F.Gens Solé, Antonio|||0000-0001-7588-7054Clay soils -- TestingClaysFabric/structure of soilsElectron microscopyPorosimetryLaboratory testsSòls argilosos -- ProvesÀrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòlsAn investigation of clay microstructure and its evolution under 1D and isotropic compression is presented for different clays. Data from the literature are compared to original results on two Italian clays, obtained using SEM, image processing, MIP and on-purpose swelling tests. The effects of composition and loading history on clay microstructure, as well as its changes along the compression path (pre- and post-gross-yielding) are analysed and a conceptual model of microstructure evolution is proposed for the clays under study. NC clays at early virgin compression, either natural or reconstituted, are found to possess an open fabric of random-low orientation, complying with a prevailing inter-aggregate and a smaller intra-aggregate porosity, whose size and distribution depend on composition. Under 1D compression, either in the field or in the laboratory, the inter-aggregate porosity is lost, at a rate dependent on composition and loading history, and the dominant intra-aggregate micro-pore is progressively reduced. Accordingly, perfectly oriented stacks of domains are recognised which, though, embed preserved random particle arrangements even at large pressures, resulting in an increase of average orientation up to the reach of a steady orientation degree. Isotropic compression causes faster microstructure evolution, although large pressures are required to change 1D-induced fabric orientation.Peer Reviewed20242024-02-0120232023-03-24journal articlehttp://purl.org/coar/resource_type/c_6501AMhttp://purl.org/coar/version/c_ab4af688f83e57aainfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/385456https://dx.doi.org/10.1680/jgeot.21.00233reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/3854562026-05-27T15:37:01Z
dc.title.none.fl_str_mv Analysis of the micro to macro response of clays to compression
title Analysis of the micro to macro response of clays to compression
spellingShingle Analysis of the micro to macro response of clays to compression
Guglielmi, S.
Clay soils -- Testing
Clays
Fabric/structure of soils
Electron microscopy
Porosimetry
Laboratory tests
Sòls argilosos -- Proves
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòls
title_short Analysis of the micro to macro response of clays to compression
title_full Analysis of the micro to macro response of clays to compression
title_fullStr Analysis of the micro to macro response of clays to compression
title_full_unstemmed Analysis of the micro to macro response of clays to compression
title_sort Analysis of the micro to macro response of clays to compression
dc.creator.none.fl_str_mv Guglielmi, S.
Cotecchia, Federica
Cafaro, F.
Gens Solé, Antonio|||0000-0001-7588-7054
author Guglielmi, S.
author_facet Guglielmi, S.
Cotecchia, Federica
Cafaro, F.
Gens Solé, Antonio|||0000-0001-7588-7054
author_role author
author2 Cotecchia, Federica
Cafaro, F.
Gens Solé, Antonio|||0000-0001-7588-7054
author2_role author
author
author
dc.subject.none.fl_str_mv Clay soils -- Testing
Clays
Fabric/structure of soils
Electron microscopy
Porosimetry
Laboratory tests
Sòls argilosos -- Proves
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòls
topic Clay soils -- Testing
Clays
Fabric/structure of soils
Electron microscopy
Porosimetry
Laboratory tests
Sòls argilosos -- Proves
Àrees temàtiques de la UPC::Enginyeria civil::Geotècnia::Mecànica de sòls
description An investigation of clay microstructure and its evolution under 1D and isotropic compression is presented for different clays. Data from the literature are compared to original results on two Italian clays, obtained using SEM, image processing, MIP and on-purpose swelling tests. The effects of composition and loading history on clay microstructure, as well as its changes along the compression path (pre- and post-gross-yielding) are analysed and a conceptual model of microstructure evolution is proposed for the clays under study. NC clays at early virgin compression, either natural or reconstituted, are found to possess an open fabric of random-low orientation, complying with a prevailing inter-aggregate and a smaller intra-aggregate porosity, whose size and distribution depend on composition. Under 1D compression, either in the field or in the laboratory, the inter-aggregate porosity is lost, at a rate dependent on composition and loading history, and the dominant intra-aggregate micro-pore is progressively reduced. Accordingly, perfectly oriented stacks of domains are recognised which, though, embed preserved random particle arrangements even at large pressures, resulting in an increase of average orientation up to the reach of a steady orientation degree. Isotropic compression causes faster microstructure evolution, although large pressures are required to change 1D-induced fabric orientation.
publishDate 2023
dc.date.none.fl_str_mv 2023
2023-03-24
2024
2024-02-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AM
http://purl.org/coar/version/c_ab4af688f83e57aa
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/385456
https://dx.doi.org/10.1680/jgeot.21.00233
url https://hdl.handle.net/2117/385456
https://dx.doi.org/10.1680/jgeot.21.00233
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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