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Unsaturated infinite slope stability considering surface flux conditions / Quentin B. Travis in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 7 (Juillet 2010) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 7 (Juillet 2010) . - pp. 963-974 Titre : Unsaturated infinite slope stability considering surface flux conditions Type de document : texte imprimé Auteurs : Quentin B. Travis, Auteur ; Sandra L. Houston, Auteur ; Fernando A. M. Marinho, Auteur Année de publication : 2010 Article en page(s) : pp. 963-974 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Cohesive  soils  Embankment  stability  Equilibrium  Failures  Landslides  Limit  equilibrium  Pore  pressure  Pore  water  Pore-water  pressure  Slope  stability  Slopes  Soil  suction  Stability  Suction  Unsaturated  flow  Unsaturated  soils Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : A slope stability model is derived for an infinite slope subjected to unsaturated infiltration flow above a phreatic surface. Closed form steady state solutions are derived for the matric suction and degree of saturation profiles. Soil unit weight, consistent with the degree of saturation profile, is also directly calculated and introduced into the analyzes, resulting in closed-form solutions for typical soil parameters and an infinite series solution for arbitrary soil parameters. The solutions are coupled with the infinite slope stability equations to establish a fully realized safety factor function. In general, consideration of soil suction results in higher factor of safety. The increase in shear strength due to the inclusion of soil suction is analogous to making an addition to the cohesion, which, of course, increases the factor of safety against sliding. However, for cohesive soils, the results show lower safety factors for slip surfaces approaching the phreatic surface compared to those produced by common safety factor calculations. The lower factor of safety is due to the increased soil unit weight considered in the matric suction model but not usually accounted for in practice wherein the soil is treated as dry above the phreatic surface. The developed model is verified with a published case study, correctly predicting stability under dry conditions and correctly predicting failure for a particular storm. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i7/p963_s1?isAuthorized=no [article] Unsaturated infinite slope stability considering surface flux conditions [texte imprimé] / Quentin B. Travis, Auteur ; Sandra L. Houston, Auteur ; Fernando A. M. Marinho, Auteur . - 2010 . - pp. 963-974. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 7 (Juillet 2010) . - pp. 963-974 Mots-clés : Cohesive  soils  Embankment  stability  Equilibrium  Failures  Landslides  Limit  equilibrium  Pore  pressure  Pore  water  Pore-water  pressure  Slope  stability  Slopes  Soil  suction  Stability  Suction  Unsaturated  flow  Unsaturated  soils Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : A slope stability model is derived for an infinite slope subjected to unsaturated infiltration flow above a phreatic surface. Closed form steady state solutions are derived for the matric suction and degree of saturation profiles. Soil unit weight, consistent with the degree of saturation profile, is also directly calculated and introduced into the analyzes, resulting in closed-form solutions for typical soil parameters and an infinite series solution for arbitrary soil parameters. The solutions are coupled with the infinite slope stability equations to establish a fully realized safety factor function. In general, consideration of soil suction results in higher factor of safety. The increase in shear strength due to the inclusion of soil suction is analogous to making an addition to the cohesion, which, of course, increases the factor of safety against sliding. However, for cohesive soils, the results show lower safety factors for slip surfaces approaching the phreatic surface compared to those produced by common safety factor calculations. The lower factor of safety is due to the increased soil unit weight considered in the matric suction model but not usually accounted for in practice wherein the soil is treated as dry above the phreatic surface. The developed model is verified with a published case study, correctly predicting stability under dry conditions and correctly predicting failure for a particular storm. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i7/p963_s1?isAuthorized=no