Shear strength investigations for a class of extraterrestrial analogue soils / Christos Vrettos in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 4 (Avril 2012)  

Public ISBD [article]  inJournal of geotechnical and geoenvironmental engineering > Vol. 138 N° 4 (Avril 2012) . - pp. 508–515 Titre : Shear strength investigations for a class of extraterrestrial analogue soils Type de document : texte imprimé Auteurs : Christos Vrettos, Auteur Année de publication : 2012 Article en page(s) : pp. 508–515 Note générale : Géologie appliquée Langues : Anglais (eng) Mots-clés : Soils Particle size distribution Shear strength Dilatancy Lunar materials Résumé : A class of granular materials is presented that was obtained from quarried intrusive igneous rock, further processed to match the grain-size distribution of typical Apollo samples. Texture, mineralogy, and chemical composition have been investigated; and the material is classified as basaltic andesite. A series of triaxial compression tests have been performed to assess the influence of confining stress on the shearing behavior at medium to low stress levels. A medium sand is used as reference. In one of the test series, corundum was added to simulate the glass particles found in the lunar regolith. Both stress-strain curves and volumetric strains are reported. All samples tested exhibit a purely dilatant behavior at low confining stress levels. Shear strength can be expressed either by a curved Mohr-Coulomb envelope or by a linear one with a cohesion intercept. Results are shown to agree well with those obtained on common lunar soil simulants. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000619 [article] Shear strength investigations for a class of extraterrestrial analogue soils [texte imprimé] / Christos Vrettos, Auteur . - 2012 . - pp. 508–515. Géologie appliquée Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 4 (Avril 2012) . - pp. 508–515 Mots-clés : Soils Particle size distribution Shear strength Dilatancy Lunar materials Résumé : A class of granular materials is presented that was obtained from quarried intrusive igneous rock, further processed to match the grain-size distribution of typical Apollo samples. Texture, mineralogy, and chemical composition have been investigated; and the material is classified as basaltic andesite. A series of triaxial compression tests have been performed to assess the influence of confining stress on the shearing behavior at medium to low stress levels. A medium sand is used as reference. In one of the test series, corundum was added to simulate the glass particles found in the lunar regolith. Both stress-strain curves and volumetric strains are reported. All samples tested exhibit a purely dilatant behavior at low confining stress levels. Shear strength can be expressed either by a curved Mohr-Coulomb envelope or by a linear one with a cohesion intercept. Results are shown to agree well with those obtained on common lunar soil simulants. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000619

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