Documents disponibles écrits par cet auteur

Recent stress-history effects on compressible Chicago glacial clays / Richard J. Finno in Journal of geotechnical and geoenvironmental engineering, Vol. 137 N° 3 (Mars 2011) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 137 N° 3 (Mars 2011) . - pp. 197-207 Titre : Recent stress-history effects on compressible Chicago glacial clays Type de document : texte imprimé Auteurs : Richard J. Finno, Auteur ; Wanjei Cho, Auteur Année de publication : 2011 Article en page(s) : pp. 197-207 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Chicago  clays  Recent  stress  history  Strain-response  envelope  Block  samples  Triaxial  tests Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper presents the results of an experimental program to investigate recent stress-history effects on small-strain stiffness of lightly overconsolidated compressible Chicago glacial clays. Stress-probe tests with different recent stress histories were conducted on high-quality block samples taken from an excavation in Evanston, Illinois. The stress histories applied prior to probing represent in situ greenfield conditions and an unloading path associated with a common situation encountered when building in congested urban areas. Results of the stress-probe tests are compared in terms of shear, volumetric, and coupled components and their stiffness degradation. Strain-response envelopes were constructed in shear and volumetric-strain space to graphically show the significant difference in these responses between the two sets of stress-probe tests. The results clearly indicate that the recent stress history affects shear, bulk, and the two cross-coupled moduli of the Chicago clays as a function of the angle change between the previous and current stress paths. Consequently, the overall characteristics of strain-response envelopes of the two sets of stress probes are different. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v137/i3/p197_s1?isAuthorized=no [article] Recent stress-history effects on compressible Chicago glacial clays [texte imprimé] / Richard J. Finno, Auteur ; Wanjei Cho, Auteur . - 2011 . - pp. 197-207. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 137 N° 3 (Mars 2011) . - pp. 197-207 Mots-clés : Chicago  clays  Recent  stress  history  Strain-response  envelope  Block  samples  Triaxial  tests Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper presents the results of an experimental program to investigate recent stress-history effects on small-strain stiffness of lightly overconsolidated compressible Chicago glacial clays. Stress-probe tests with different recent stress histories were conducted on high-quality block samples taken from an excavation in Evanston, Illinois. The stress histories applied prior to probing represent in situ greenfield conditions and an unloading path associated with a common situation encountered when building in congested urban areas. Results of the stress-probe tests are compared in terms of shear, volumetric, and coupled components and their stiffness degradation. Strain-response envelopes were constructed in shear and volumetric-strain space to graphically show the significant difference in these responses between the two sets of stress-probe tests. The results clearly indicate that the recent stress history affects shear, bulk, and the two cross-coupled moduli of the Chicago clays as a function of the angle change between the previous and current stress paths. Consequently, the overall characteristics of strain-response envelopes of the two sets of stress probes are different. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v137/i3/p197_s1?isAuthorized=no

Stress-strain responses of block samples of compressible chicago glacial clays / Wanjei Cho in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 1 (Janvier 2010) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 1 (Janvier 2010) . - pp. 178-188 Titre : Stress-strain responses of block samples of compressible chicago glacial clays Type de document : texte imprimé Auteurs : Wanjei Cho, Auteur ; Richard J. Finno, Auteur Article en page(s) : pp. 178-188 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Chicago  clay  Cross  anisotropy  Stiffness  Limit  state  Bender  element  Experiments Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper presents the results and analysis of a laboratory investigation of the behavior of lightly overconsolidated compressible Chicago glacial clays over a wide strain range. Each specimen was trimmed from high quality block samples taken from an excavation in Evanston, Illinois. Specimens were instrumented with three sets of bender elements and local LVDTs. After K0 consolidation to the in situ vertical effective stress of the block, drained stress probe tests were conducted. Results of bender elements tests obtained prior to stress probing show that compressible Chicago glacial clay initially is cross anisotropic. Propagation velocities measured by bender elements in axial direction after K0 reconsolidation and drained creep agrees well with the in situ shear wave velocity measured by seismic cone penetration tests. Results of drained stress probe tests are analyzed in terms of shear, volumetric and coupled stiffness, stiffness degradation, and direction of loading. The significant variability of shear, bulk and cross-coupling response depending on stress path direction and strain level provide experimental evidence that the Chicago clays are incrementally nonlinear at the strain levels investigated. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JGGEFK&smode=strres [...] [article] Stress-strain responses of block samples of compressible chicago glacial clays [texte imprimé] / Wanjei Cho, Auteur ; Richard J. Finno, Auteur . - pp. 178-188. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 1 (Janvier 2010) . - pp. 178-188 Mots-clés : Chicago  clay  Cross  anisotropy  Stiffness  Limit  state  Bender  element  Experiments Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper presents the results and analysis of a laboratory investigation of the behavior of lightly overconsolidated compressible Chicago glacial clays over a wide strain range. Each specimen was trimmed from high quality block samples taken from an excavation in Evanston, Illinois. Specimens were instrumented with three sets of bender elements and local LVDTs. After K0 consolidation to the in situ vertical effective stress of the block, drained stress probe tests were conducted. Results of bender elements tests obtained prior to stress probing show that compressible Chicago glacial clay initially is cross anisotropic. Propagation velocities measured by bender elements in axial direction after K0 reconsolidation and drained creep agrees well with the in situ shear wave velocity measured by seismic cone penetration tests. Results of drained stress probe tests are analyzed in terms of shear, volumetric and coupled stiffness, stiffness degradation, and direction of loading. The significant variability of shear, bulk and cross-coupling response depending on stress path direction and strain level provide experimental evidence that the Chicago clays are incrementally nonlinear at the strain levels investigated. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JGGEFK&smode=strres [...]