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Stiff sedimentary clays / R. J. Chandler in Géotechnique, Vol. 60 N° 12 (Décembre 2010) 

Public ISBD [article]  in Géotechnique > Vol. 60 N° 12 (Décembre 2010) . - pp. 891–902 Titre : Stiff sedimentary clays : geological origins and engineering properties Type de document : texte imprimé Auteurs : R. J. Chandler, Auteur Année de publication : 2011 Article en page(s) : pp. 891–902 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Clays  Sedimentation  Laboratory  tests  Erosion  Geology Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This Keynote Paper† summarises and extends earlier work on the characterisation of clays, with particular reference to stiff sedimentary clays. Examples of clay characterisation are given that include the various main geological events, from sedimentation to erosion and weathering, and other phenomena such as diagenesis and brecciation. The examples demonstrate the value of plotting basic data, such as the current stress state and undrained strength, in terms of the void index. These three parameters permit an immediate, simple categorisation, in terms of geological history, of sedimentary clays. Further examples illustrate the engineering consequences of weathering of stiff clays, and the associated phenomenon of brecciation produced by the processes of cambering and valley bulging. It is emphasised that, at all stages in a clay's geological history, it is the bond strength between the soil particles, not the geological preconsolidation stress, that controls the mechanical behaviour of sedimentary clays. At all geological stages the bond strength contributes to sensitivity in terms of both stress state and strength. These sensitivities are measured against two intrinsic behaviour patterns, the intrinsic compression line and the intrinsic strength line, both of which are defined, and both of which have considerable value for the characterisation of clays. In particular, the relations between yield stress in oedometer compression and triaxial undrained strength enable the quality of laboratory test data to be assessed. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.07.kp.001 [article] Stiff sedimentary clays : geological origins and engineering properties [texte imprimé] / R. J. Chandler, Auteur . - 2011 . - pp. 891–902. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 60 N° 12 (Décembre 2010) . - pp. 891–902 Mots-clés : Clays  Sedimentation  Laboratory  tests  Erosion  Geology Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This Keynote Paper† summarises and extends earlier work on the characterisation of clays, with particular reference to stiff sedimentary clays. Examples of clay characterisation are given that include the various main geological events, from sedimentation to erosion and weathering, and other phenomena such as diagenesis and brecciation. The examples demonstrate the value of plotting basic data, such as the current stress state and undrained strength, in terms of the void index. These three parameters permit an immediate, simple categorisation, in terms of geological history, of sedimentary clays. Further examples illustrate the engineering consequences of weathering of stiff clays, and the associated phenomenon of brecciation produced by the processes of cambering and valley bulging. It is emphasised that, at all stages in a clay's geological history, it is the bond strength between the soil particles, not the geological preconsolidation stress, that controls the mechanical behaviour of sedimentary clays. At all geological stages the bond strength contributes to sensitivity in terms of both stress state and strength. These sensitivities are measured against two intrinsic behaviour patterns, the intrinsic compression line and the intrinsic strength line, both of which are defined, and both of which have considerable value for the characterisation of clays. In particular, the relations between yield stress in oedometer compression and triaxial undrained strength enable the quality of laboratory test data to be assessed. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.07.kp.001

Thin-sample technique of residual strength measurement / R. J. Chandler in Géotechnique, Vol. 39 N°3 (Septembre 1989) 

Public ISBD [article]  in Géotechnique > Vol. 39 N°3 (Septembre 1989) . - pp. 527 –531 Titre : Thin-sample technique of residual strength measurement Type de document : texte imprimé Auteurs : R. J. Chandler, Auteur ; T. N. Hardie, Auteur Année de publication : 2007 Article en page(s) : pp. 527 –531 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Clays  Landslides  Shear  strength  Shear  tests  Soil  properties Note de contenu : Technical Note ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.1989.39.3.527 [article] Thin-sample technique of residual strength measurement [texte imprimé] / R. J. Chandler, Auteur ; T. N. Hardie, Auteur . - 2007 . - pp. 527 –531. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 39 N°3 (Septembre 1989) . - pp. 527 –531 Mots-clés : Clays  Landslides  Shear  strength  Shear  tests  Soil  properties Note de contenu : Technical Note ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.1989.39.3.527