| Titre : | Postcyclic reconsolidation strains in low-plastic fraser river silt due to dissipation of excess pore-water pressures |
| Auteurs : | Dharma Wijewickreme, Auteur ; Maria V. Sanin, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Journal of geotechnical and geoenvironmental engineering (Vol. 136 N° 10, Octobre 2010) |
| Article en page(s) : | pp. 1347-1357 |
| Note générale : | Géotechnique |
| Langues : | Anglais |
| Index. décimale : | 624.1 (Infrastructures.Ouvrages en terre. Fondations. Tunnels) |
| Tags : | Shear tests Soil liquefaction Earthquakes Silts Cyclic loads consolidation Pore water Water pressure Canada |
| 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=strresults&sort=chron&maxdisp=25&pjournals=JGGEFK&pyears=2010&possible1zone=article&fromyear=2010&frommonth=Oct&fromvolume=136&fromissue=10&OUTLOG=NO&viewabs=JGGEFK&key=DISPLAY&docI |
