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Quantifying biomediated ground improvement by ureolysis / Leon A. Van Paassen in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 12 (Décembre 2010) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 12 (Décembre 2010) . - pp. 1721-1728 Titre : Quantifying biomediated ground improvement by ureolysis : large-scale biogrout experiment Type de document : texte imprimé Auteurs : Leon A. Van Paassen, Auteur ; Ranajit Ghose, Auteur ; Thomas J. M. Van Der Linden, Auteur Année de publication : 2011 Article en page(s) : pp. 1721-1728 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Smartsoils  MICP  Urea  hydrolysis  Urease  Sporosarcina  pasteurii  Shear-wave  velocity  UCS  Seismic  monitoring Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Biogrouting is a biological ground improvement method, in which microorganisms are used to induce carbonate precipitation in the subsurface in order to increase the strength and stiffness of granular soils. In this paper the results of a large-scale experiment (100 m3) are presented, in which the feasibility of biogrouting as a ground improvement method is investigated using techniques and equipment similar to those used in potential applications. In situ geophysical measurements were used to monitor the biogrouting process during treatment and indicated that the stiffness had increased significantly after one day of treatment. The results of unconfined compressive strength tests on samples which were excavated after treatment were used to assess the distribution of mechanical properties throughout the cemented sand body, which correlated quite well with the results of the in situ geophysical measurements. The stiffness increase could be quantified as a function of the injected volume of grouting agents and the distance from the injection points. These results will serve as an important benchmark for future applications of biomediated ground improvement. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i12/p1721_s1?isAuthorized=no [article] Quantifying biomediated ground improvement by ureolysis : large-scale biogrout experiment [texte imprimé] / Leon A. Van Paassen, Auteur ; Ranajit Ghose, Auteur ; Thomas J. M. Van Der Linden, Auteur . - 2011 . - pp. 1721-1728. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 12 (Décembre 2010) . - pp. 1721-1728 Mots-clés : Smartsoils  MICP  Urea  hydrolysis  Urease  Sporosarcina  pasteurii  Shear-wave  velocity  UCS  Seismic  monitoring Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Biogrouting is a biological ground improvement method, in which microorganisms are used to induce carbonate precipitation in the subsurface in order to increase the strength and stiffness of granular soils. In this paper the results of a large-scale experiment (100 m3) are presented, in which the feasibility of biogrouting as a ground improvement method is investigated using techniques and equipment similar to those used in potential applications. In situ geophysical measurements were used to monitor the biogrouting process during treatment and indicated that the stiffness had increased significantly after one day of treatment. The results of unconfined compressive strength tests on samples which were excavated after treatment were used to assess the distribution of mechanical properties throughout the cemented sand body, which correlated quite well with the results of the in situ geophysical measurements. The stiffness increase could be quantified as a function of the injected volume of grouting agents and the distance from the injection points. These results will serve as an important benchmark for future applications of biomediated ground improvement. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i12/p1721_s1?isAuthorized=no