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Effects of water content and particle crushing on the shear behaviour of an infilled-joint soil / Y. Zhao in Géotechnique, Vol. 62 N° 12 (Décembre 2012) 

Public ISBD [article]  in Géotechnique > Vol. 62 N° 12 (Décembre 2012) . - pp. 1133 –1137 Titre : Effects of water content and particle crushing on the shear behaviour of an infilled-joint soil Type de document : texte imprimé Auteurs : Y. Zhao, Auteur ; H. Zhou, Auteur ; X. T. Feng, Auteur Année de publication : 2012 Article en page(s) : pp. 1133 –1137 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Laboratory  tests  Suction  Particle  crushing/crushability  Shear  strength Résumé : Ring shear tests were carried out on a compacted low-plasticity infilled-joint soil from Beihetan site in China. Different initial water contents (5·0, 9·0 and 13·5%) were considered. It was observed that the failure envelope is linear for the peak deviator stress but highly non-linear for the residual deviator stress in the range of high normal stresses (higher than 400 kPa), evidencing the particle crushing effect on the residual strength. Furthermore, this particle crushing effect was dependent on water content: the residual friction angle is larger at higher water content. Further grain size analysis was performed on the portion taken in the zone of shear band after each test, and changes of the fractions of 75 μm and 2 μm were compared for different water contents. The results indicate clearly that the effect of water content on particle crushing depends on particle size. For large particles (> 75 μm), water content increase enhances the particle crushing by the fracture mechanism. On the contrary, for smaller particles (< 2 μm), water content increase reduces the particle crushing by the mechanism of attrition or abrasion. Deeper analysis of the effect of the ratio of the final to initial fraction of soil with particle size less than 2 μm, S2, on the shear strength suggests that the effect of particle crushing on the residual shear strength is mainly through the production of extra clay-size particles (< 2 μm). ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.11.P.060 [article] Effects of water content and particle crushing on the shear behaviour of an infilled-joint soil [texte imprimé] / Y. Zhao, Auteur ; H. Zhou, Auteur ; X. T. Feng, Auteur . - 2012 . - pp. 1133 –1137. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 62 N° 12 (Décembre 2012) . - pp. 1133 –1137 Mots-clés : Laboratory  tests  Suction  Particle  crushing/crushability  Shear  strength Résumé : Ring shear tests were carried out on a compacted low-plasticity infilled-joint soil from Beihetan site in China. Different initial water contents (5·0, 9·0 and 13·5%) were considered. It was observed that the failure envelope is linear for the peak deviator stress but highly non-linear for the residual deviator stress in the range of high normal stresses (higher than 400 kPa), evidencing the particle crushing effect on the residual strength. Furthermore, this particle crushing effect was dependent on water content: the residual friction angle is larger at higher water content. Further grain size analysis was performed on the portion taken in the zone of shear band after each test, and changes of the fractions of 75 μm and 2 μm were compared for different water contents. The results indicate clearly that the effect of water content on particle crushing depends on particle size. For large particles (> 75 μm), water content increase enhances the particle crushing by the fracture mechanism. On the contrary, for smaller particles (< 2 μm), water content increase reduces the particle crushing by the mechanism of attrition or abrasion. Deeper analysis of the effect of the ratio of the final to initial fraction of soil with particle size less than 2 μm, S2, on the shear strength suggests that the effect of particle crushing on the residual shear strength is mainly through the production of extra clay-size particles (< 2 μm). ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.11.P.060