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Titre :
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Recent stress-history effects on compressible Chicago glacial clays (2011)
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Auteurs :
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Richard J. Finno, Auteur ;
Wanjei Cho, Auteur
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Type de document :
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Article : texte imprimé
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Dans :
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Journal of geotechnical and geoenvironmental engineering (Vol. 137 N° 3, Mars 2011)
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Article en page(s) :
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pp. 197-207
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Note générale :
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Géotechnique
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Langues :
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Anglais
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Index. décimale :
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624.1 (Infrastructures.Ouvrages en terre. Fondations. Tunnels)
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Tags :
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Chicago clays Recent stress history Strain-response envelope Block samples Triaxial tests
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Résumé :
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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.
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DEWEY :
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624.1
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ISSN :
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1090-0241
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En ligne :
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http://ascelibrary.org/gto/resource/1/jggefk/v137/i3/p197_s1?isAuthorized=no
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