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Stability charts for the collapse of residual soil in karst / Eric C. Drumm in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 7 (Juillet 2009) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 7 (Juillet 2009) . - pp. 925–931 Titre : Stability charts for the collapse of residual soil in karst Type de document : texte imprimé Auteurs : Eric C. Drumm, Auteur ; Özgür Aktürk, Auteur ; Haluk Akgün, Auteur Année de publication : 2009 Article en page(s) : pp. 925–931 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Karst  Residual  soils  Finite  element  method  Void  Stability  Shear  strength Résumé : Collapse of the residual soil over bedrock cavities often occurs during construction in karst terrain, particularly when the thickness of the residuum is reduced during excavation. Even if an estimate of the strength of the residual soil is known, uncertainty with respect to the size/geometry of the subterranean voids makes a detailed analysis difficult, and straightforward methods to check the stability are needed. In this study, numerical analyses were performed to develop a stability chart expressed in terms of a dimensionless stability number and the geometry of a potential void in the residual soil. The stability charts include the effect of friction angle, and are also developed to allow the investigation of the effect of the inverted strength profile typically observed in karst terrain. Such stability numbers may be useful to estimate the stability of a given site based on the expected thickness of the soil overburden and the likely range of anticipated soil void diameters. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000066 [article] Stability charts for the collapse of residual soil in karst [texte imprimé] / Eric C. Drumm, Auteur ; Özgür Aktürk, Auteur ; Haluk Akgün, Auteur . - 2009 . - pp. 925–931. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 7 (Juillet 2009) . - pp. 925–931 Mots-clés : Karst  Residual  soils  Finite  element  method  Void  Stability  Shear  strength Résumé : Collapse of the residual soil over bedrock cavities often occurs during construction in karst terrain, particularly when the thickness of the residuum is reduced during excavation. Even if an estimate of the strength of the residual soil is known, uncertainty with respect to the size/geometry of the subterranean voids makes a detailed analysis difficult, and straightforward methods to check the stability are needed. In this study, numerical analyses were performed to develop a stability chart expressed in terms of a dimensionless stability number and the geometry of a potential void in the residual soil. The stability charts include the effect of friction angle, and are also developed to allow the investigation of the effect of the inverted strength profile typically observed in karst terrain. Such stability numbers may be useful to estimate the stability of a given site based on the expected thickness of the soil overburden and the likely range of anticipated soil void diameters. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000066