Postcyclic reconsolidation strains in low-plastic fraser river silt due to dissipation of excess pore-water pressures / Dharma Wijewickreme in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 10 (Octobre 2010)  

Public ISBD [article]  inJournal of geotechnical and geoenvironmental engineering > Vol. 136 N° 10 (Octobre 2010) . - pp. 1347-1357 Titre : Postcyclic reconsolidation strains in low-plastic fraser river silt due to dissipation of excess pore-water pressures Type de document : texte imprimé Auteurs : Dharma Wijewickreme, Auteur ; Maria V. Sanin, Auteur Article en page(s) : pp. 1347-1357 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Shear tests Soil liquefaction Earthquakes Silts Cyclic loads consolidation Pore water Water pressure Canada Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : The postcyclic reconsolidation response of low-plastic Fraser River silt was examined using laboratory direct simple shear testing. Specimens of undisturbed and reconstituted natural low-plastic Fraser River silt and reconstituted quartz powder, initially subjected to constant-volume cyclic loading under different cyclic stress ratios (CSRs) and then reconsolidated to their initial effective stresses (sigmavo[prime]), were specifically investigated. The volumetric strains during postcyclic reconsolidation (epsilonv-ps) were noted to generally increase with the maximum cyclic excess pore-water pressure (Deltaumax) and maximum cyclic shear strain experienced by the specimens during cyclic loading. The values of epsilonv-ps and maximum cyclic excess pore-water pressure ratio (ru-max) were observed to form a coherent relationship regardless of overconsolidation effects, particle fabric, and initial (precyclic) void ratio of the soil. The specimens with high ru-max suffered significantly higher postcyclic reconsolidation strains; epsilonv-ps ranging between 1.5 and 5% were noted when ru-max>0.8. The observed epsilonv-ps versus ru-max relationship, when used in combination with the observed dependence of cyclic excess pore-water pressure on CSR and number of load cycles, seems to provide a reasonable approach to estimate postcyclic reconsolidation strains of low-plastic silt. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JGGEFK&smode=strres [...] [article] Postcyclic reconsolidation strains in low-plastic fraser river silt due to dissipation of excess pore-water pressures [texte imprimé] / Dharma Wijewickreme, Auteur ; Maria V. Sanin, Auteur . - pp. 1347-1357. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 10 (Octobre 2010) . - pp. 1347-1357 Mots-clés : Shear tests Soil liquefaction Earthquakes Silts Cyclic loads consolidation Pore water Water pressure Canada Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : The postcyclic reconsolidation response of low-plastic Fraser River silt was examined using laboratory direct simple shear testing. Specimens of undisturbed and reconstituted natural low-plastic Fraser River silt and reconstituted quartz powder, initially subjected to constant-volume cyclic loading under different cyclic stress ratios (CSRs) and then reconsolidated to their initial effective stresses (sigmavo[prime]), were specifically investigated. The volumetric strains during postcyclic reconsolidation (epsilonv-ps) were noted to generally increase with the maximum cyclic excess pore-water pressure (Deltaumax) and maximum cyclic shear strain experienced by the specimens during cyclic loading. The values of epsilonv-ps and maximum cyclic excess pore-water pressure ratio (ru-max) were observed to form a coherent relationship regardless of overconsolidation effects, particle fabric, and initial (precyclic) void ratio of the soil. The specimens with high ru-max suffered significantly higher postcyclic reconsolidation strains; epsilonv-ps ranging between 1.5 and 5% were noted when ru-max>0.8. The observed epsilonv-ps versus ru-max relationship, when used in combination with the observed dependence of cyclic excess pore-water pressure on CSR and number of load cycles, seems to provide a reasonable approach to estimate postcyclic reconsolidation strains of low-plastic silt. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JGGEFK&smode=strres [...]

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