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Anisotropy evolution and irrecoverable deformation in triaxial stress probes / Taesik Kim in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 2 (Fevrier 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 2 (Fevrier 2012) . - pp. 155-165 Titre : Anisotropy evolution and irrecoverable deformation in triaxial stress probes Type de document : texte imprimé Auteurs : Taesik Kim, Auteur ; Richard J. Finno, Auteur Année de publication : 2012 Article en page(s) : pp. 155-165 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Bender  elements  Wave  measurement  Block  sample  Experiments  Chicago  clay  Yields  Stiffness  anisotropy Résumé : This paper presents the results and analysis of experimental investigations of compressible Chicago clays with regard to the evolution of stiffness anisotropy. The experimental program was conducted on high-quality block samples obtained from the excavation for the Block 37 project in Chicago. The specimens were consolidated to in situ stresses via a recompression technique and then were subjected to directional stress probes. On-specimen LVDTs and an internal load cell with high accuracy were used for stress-strain response of the specimen. The stiffness and stiffness anisotropy ratio at very small strains were obtained synchronously from bender element tests during the consolidation and stress probes. The structural change as anisotropy evolves within a specimen is discussed. The results of the experimental program showed that compressible Chicago clay is an initially cross-anisotropic material under the in situ stresses. This anisotropy changes at the onset of irrecoverable deformation at stresses defined by previously established Y2 yield surfaces. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v138/i2/p155_s1?isAuthorized=no [article] Anisotropy evolution and irrecoverable deformation in triaxial stress probes [texte imprimé] / Taesik Kim, Auteur ; Richard J. Finno, Auteur . - 2012 . - pp. 155-165. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 2 (Fevrier 2012) . - pp. 155-165 Mots-clés : Bender  elements  Wave  measurement  Block  sample  Experiments  Chicago  clay  Yields  Stiffness  anisotropy Résumé : This paper presents the results and analysis of experimental investigations of compressible Chicago clays with regard to the evolution of stiffness anisotropy. The experimental program was conducted on high-quality block samples obtained from the excavation for the Block 37 project in Chicago. The specimens were consolidated to in situ stresses via a recompression technique and then were subjected to directional stress probes. On-specimen LVDTs and an internal load cell with high accuracy were used for stress-strain response of the specimen. The stiffness and stiffness anisotropy ratio at very small strains were obtained synchronously from bender element tests during the consolidation and stress probes. The structural change as anisotropy evolves within a specimen is discussed. The results of the experimental program showed that compressible Chicago clay is an initially cross-anisotropic material under the in situ stresses. This anisotropy changes at the onset of irrecoverable deformation at stresses defined by previously established Y2 yield surfaces. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v138/i2/p155_s1?isAuthorized=no

Effects of stress path rotation angle on small strain responses / Richard J. Finno in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 4 (Avril 2012) . - pp. 526–534 Titre : Effects of stress path rotation angle on small strain responses Type de document : texte imprimé Auteurs : Richard J. Finno, Auteur ; Taesik Kim, Auteur Année de publication : 2012 Article en page(s) : pp. 526–534 Note générale : Géologie appliquée Langues : Anglais (eng) Mots-clés : Chicago  clay  Recent  stress  history  Block  sample  Triaxial  Stress-strain  data Résumé : The results of experimental studies on the stress-strain behavior of Chicago glacial clays are presented and discussed. This paper describes small strain responses as a function of stress path rotation angle. Undrained compression and extension tests with three different preshear stress paths were conducted on high quality, hand-cut block samples obtained at two different depths from the excavation for the Block 37 project in Chicago. One preshear stress path was applied to investigate the stress-strain response representative of the in situ conditions via a recompression technique. The other two preshear stress paths were selected to isolate the effects of recent stress history such that the only difference between the two sets of paths was the direction of loading to a common effective stress condition. A period of drained creep at constant effective stress was imposed on all specimens prior to shearing to negate the possible effects of creep on the small strain responses. The results are discussed in terms of secant shear modulus, shear strain, and stress path rotation angle. The results of experiments show that recent stress history affects the small strain behavior of compressible Chicago clays. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000612 [article] Effects of stress path rotation angle on small strain responses [texte imprimé] / Richard J. Finno, Auteur ; Taesik Kim, Auteur . - 2012 . - pp. 526–534. Géologie appliquée Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 4 (Avril 2012) . - pp. 526–534 Mots-clés : Chicago  clay  Recent  stress  history  Block  sample  Triaxial  Stress-strain  data Résumé : The results of experimental studies on the stress-strain behavior of Chicago glacial clays are presented and discussed. This paper describes small strain responses as a function of stress path rotation angle. Undrained compression and extension tests with three different preshear stress paths were conducted on high quality, hand-cut block samples obtained at two different depths from the excavation for the Block 37 project in Chicago. One preshear stress path was applied to investigate the stress-strain response representative of the in situ conditions via a recompression technique. The other two preshear stress paths were selected to isolate the effects of recent stress history such that the only difference between the two sets of paths was the direction of loading to a common effective stress condition. A period of drained creep at constant effective stress was imposed on all specimens prior to shearing to negate the possible effects of creep on the small strain responses. The results are discussed in terms of secant shear modulus, shear strain, and stress path rotation angle. The results of experiments show that recent stress history affects the small strain behavior of compressible Chicago clays. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000612