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Reliability assessment of basal-heave stability for braced excavations in clay / A. T. C. Goh in Journal of geotechnical and geoenvironmental engineering, Vol. 134 N°2 (Fevrier 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°2 (Fevrier 2008) . - pp. 145–153 Titre : Reliability assessment of basal-heave stability for braced excavations in clay Type de document : texte imprimé Auteurs : A. T. C. Goh, Auteur ; F. H. Kulhawy, Auteur ; K. S. Wong, Auteur Année de publication : 2008 Article en page(s) : pp. 145–153 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Bracing  Excavation  Clays  Safety  Retaining  walls  Structural  reliability Résumé : One potential failure mechanism that needs to be considered for the design of braced excavations in soft clays is basal-heave instability. Many uncertainties are associated with the calculation of the basal-heave factor of safety, including the variabilities of the loadings, geotechnical soil properties, and engineering and geometrical properties of the wall. A risk-based approach to failure is necessary to incorporate systematically the uncertainties associated with the various design parameters. This paper demonstrates the potential for the reliability index–based approach for evaluating the basal-heave stability of braced excavations in clay. By using basic structural reliability concepts that reflect the degree of uncertainty of the underlying random variables in the analyses, engineers will have increased awareness of the uncertainties and their effects on the probability of failure. This study shows that the assumption of a linear limit state (failure) surface can be used to provide reasonable estimates of the reliability index and the probability of failure. Mathematical expressions, tables, and charts have been provided to estimate the probability of basal-heave failure for wide and deep excavations. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A2%2814 [...] [article] Reliability assessment of basal-heave stability for braced excavations in clay [texte imprimé] / A. T. C. Goh, Auteur ; F. H. Kulhawy, Auteur ; K. S. Wong, Auteur . - 2008 . - pp. 145–153. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°2 (Fevrier 2008) . - pp. 145–153 Mots-clés : Bracing  Excavation  Clays  Safety  Retaining  walls  Structural  reliability Résumé : One potential failure mechanism that needs to be considered for the design of braced excavations in soft clays is basal-heave instability. Many uncertainties are associated with the calculation of the basal-heave factor of safety, including the variabilities of the loadings, geotechnical soil properties, and engineering and geometrical properties of the wall. A risk-based approach to failure is necessary to incorporate systematically the uncertainties associated with the various design parameters. This paper demonstrates the potential for the reliability index–based approach for evaluating the basal-heave stability of braced excavations in clay. By using basic structural reliability concepts that reflect the degree of uncertainty of the underlying random variables in the analyses, engineers will have increased awareness of the uncertainties and their effects on the probability of failure. This study shows that the assumption of a linear limit state (failure) surface can be used to provide reasonable estimates of the reliability index and the probability of failure. Mathematical expressions, tables, and charts have been provided to estimate the probability of basal-heave failure for wide and deep excavations. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A2%2814 [...]