Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Stability of Slopes Under Unsaturated Conditions Using a Modified Upper Bound Theorem
It has been widely accepted that the contribution of suction stress has a considerable influence on the mechanical characteristics of soils. This contribution has demonstrated suction stress's ability to impart strength to many geotechnical structures such as slopes and vertical cuts through partial saturation. This paper, therefore, reports a numerical study of the suction influence on the mechanical characterization of a slope at various saturation conditions using an upper bound theorem modified by the author. Therefore, a parametric study was carried out to examine the influence of the suction at various φ′ and c′ on the stability number (N). A substantial decrease in N was obtained for unsaturated cases when compared to the full saturation. This was over and above that can be expected due to a slight rise in shear strength parameters. A decrease of ~ 34.1% in N, equivalent to an increase of ~ 1.52 fold in factor of safety at φ′ = 30° and c′ = 5 kPa, was obtained when the water table dropped 3 m from the surface (full saturation). This was equivalent to model the fully saturated case at φ′ = 30° but with c′ ≈ 9 kPa. Failure mechanisms were also studied using a variety of cases where a considerable role of suction was obtained.
Stability of Slopes Under Unsaturated Conditions Using a Modified Upper Bound Theorem
It has been widely accepted that the contribution of suction stress has a considerable influence on the mechanical characteristics of soils. This contribution has demonstrated suction stress's ability to impart strength to many geotechnical structures such as slopes and vertical cuts through partial saturation. This paper, therefore, reports a numerical study of the suction influence on the mechanical characterization of a slope at various saturation conditions using an upper bound theorem modified by the author. Therefore, a parametric study was carried out to examine the influence of the suction at various φ′ and c′ on the stability number (N). A substantial decrease in N was obtained for unsaturated cases when compared to the full saturation. This was over and above that can be expected due to a slight rise in shear strength parameters. A decrease of ~ 34.1% in N, equivalent to an increase of ~ 1.52 fold in factor of safety at φ′ = 30° and c′ = 5 kPa, was obtained when the water table dropped 3 m from the surface (full saturation). This was equivalent to model the fully saturated case at φ′ = 30° but with c′ ≈ 9 kPa. Failure mechanisms were also studied using a variety of cases where a considerable role of suction was obtained.
Stability of Slopes Under Unsaturated Conditions Using a Modified Upper Bound Theorem
Karkush, Mahdi O. (Herausgeber:in) / Choudhury, Deepankar (Herausgeber:in) / Shwan, Bestun J. (Autor:in)
Geotechnical Engineering and Sustainable Construction ; Kapitel: 18 ; 221-227
20.03.2022
7 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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