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Ground improvement using vacuum loading together with vertical drains / G. Mesri in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 6 (Juin 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 6 (Juin 2012) . - pp. 680–689 Titre : Ground improvement using vacuum loading together with vertical drains Type de document : texte imprimé Auteurs : G. Mesri, Auteur ; A. Q. Khan, Auteur Année de publication : 2012 Article en page(s) : pp. 680–689 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Vacuum  consolidation  Vertical  drains  Ground  improvement  Preloading  Precompression  Soft  clay  and  silt  deposits Résumé : The use of vacuum as a preload together with vertical drains to reduce postconstruction settlement and increase the shear strength of soft ground is increasingly popular. However, conflicting views concerning preloading by vacuum consolidation continue to be disseminated. A review and interpretation of case histories of vacuum loading together with vertical drains indicates that (1) with a novel definition of excess pore-water pressure, existing theories of consolidation, solutions, and associated computer programs that have been developed for fill loading can be applied without any modification to vacuum loading; (2) vacuum that is available in the drainage blanket remains constant with depth within the vertical drains; (3) for vacuum loading as for fill loading, vertical drains may display well resistance; (4) there is no difference in magnitude and rate of settlement for a vacuum load and an equivalent fill load; (5) all empirical concepts of undrained shear strength that have originated from fill loading of soft ground are equally applicable for vacuum loading; (6) a correlation between vertical settlement and horizontal displacement for vacuum loading is expected because both result from consolidation; and (7) preloading by vacuum is accomplished in a shorter period because there is no possibility of undrained failure during vacuum loading, whereas fill loading may require construction in stages to avoid undrained bearing-capacity failure. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000640 [article] Ground improvement using vacuum loading together with vertical drains [texte imprimé] / G. Mesri, Auteur ; A. Q. Khan, Auteur . - 2012 . - pp. 680–689. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 6 (Juin 2012) . - pp. 680–689 Mots-clés : Vacuum  consolidation  Vertical  drains  Ground  improvement  Preloading  Precompression  Soft  clay  and  silt  deposits Résumé : The use of vacuum as a preload together with vertical drains to reduce postconstruction settlement and increase the shear strength of soft ground is increasingly popular. However, conflicting views concerning preloading by vacuum consolidation continue to be disseminated. A review and interpretation of case histories of vacuum loading together with vertical drains indicates that (1) with a novel definition of excess pore-water pressure, existing theories of consolidation, solutions, and associated computer programs that have been developed for fill loading can be applied without any modification to vacuum loading; (2) vacuum that is available in the drainage blanket remains constant with depth within the vertical drains; (3) for vacuum loading as for fill loading, vertical drains may display well resistance; (4) there is no difference in magnitude and rate of settlement for a vacuum load and an equivalent fill load; (5) all empirical concepts of undrained shear strength that have originated from fill loading of soft ground are equally applicable for vacuum loading; (6) a correlation between vertical settlement and horizontal displacement for vacuum loading is expected because both result from consolidation; and (7) preloading by vacuum is accomplished in a shorter period because there is no possibility of undrained failure during vacuum loading, whereas fill loading may require construction in stages to avoid undrained bearing-capacity failure. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000640