A new analsis procedure to explain a slope failure at the Martin Lake mine / T. W. Miller in Géotechnique, Vol. 39 N°1 (Mars 1989)  

Public ISBD [article]  inGéotechnique > Vol. 39 N°1 (Mars 1989) . - pp. 107 –123 Titre : A new analsis procedure to explain a slope failure at the Martin Lake mine Type de document : texte imprimé Auteurs : T. W. Miller, Auteur ; J. M. Hamilton, Auteur Année de publication : 2007 Article en page(s) : pp. 107 –123 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Case history Design/analysis Stability Failure Plasticity Analysis Limit state Résumé : A general failure mechanism, which is incorporated in an upper-bound analysis procedure and involves both continuous deformation and rigid-body rotation, has been developed. Analyses with this mechanism result in improved predictions for the design of slopes whose stability is affected by moderately high water pressures. In such cases, use of conventional analysis procedures may some-times lead to unsafe conditions. The mechanism was developed to explain a welldocumented slope failure at an operating lignite mine in north-east Texas. Analyses with the improved mechanism indicate that the slope was marginally stable, with a safety factor of 1·04, when it was being surveyed two days before it failed. Only a small increase in the water pressures, as indicated by a 0·5 m increase in the height of the water table near the slope face, was required for the safety factor to drop to 1·0. In contrast, both a conventional upper-bound analysis incorporating a rigid-body failure mechanism and a limiting-equilibrium analysis based on Spencer's method predict that the slope would be stable with a safety factor of 1·28 for the latter water pressure conditions. Comparisons of results with published solutions also indicate that the new mechanism can result in improved predictions of slope stability. The most significant improvement occurred in the analysis of the slide at Lodalen, where a stability analysis which used Bishop's method resulted in a safety factor of 1·05. In contrast, the new method produced a safety factor of 0·95. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.1989.39.1.107 [article] A new analsis procedure to explain a slope failure at the Martin Lake mine [texte imprimé] / T. W. Miller, Auteur ; J. M. Hamilton, Auteur . - 2007 . - pp. 107 –123. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 39 N°1 (Mars 1989) . - pp. 107 –123 Mots-clés : Case history Design/analysis Stability Failure Plasticity Analysis Limit state Résumé : A general failure mechanism, which is incorporated in an upper-bound analysis procedure and involves both continuous deformation and rigid-body rotation, has been developed. Analyses with this mechanism result in improved predictions for the design of slopes whose stability is affected by moderately high water pressures. In such cases, use of conventional analysis procedures may some-times lead to unsafe conditions. The mechanism was developed to explain a welldocumented slope failure at an operating lignite mine in north-east Texas. Analyses with the improved mechanism indicate that the slope was marginally stable, with a safety factor of 1·04, when it was being surveyed two days before it failed. Only a small increase in the water pressures, as indicated by a 0·5 m increase in the height of the water table near the slope face, was required for the safety factor to drop to 1·0. In contrast, both a conventional upper-bound analysis incorporating a rigid-body failure mechanism and a limiting-equilibrium analysis based on Spencer's method predict that the slope would be stable with a safety factor of 1·28 for the latter water pressure conditions. Comparisons of results with published solutions also indicate that the new mechanism can result in improved predictions of slope stability. The most significant improvement occurred in the analysis of the slide at Lodalen, where a stability analysis which used Bishop's method resulted in a safety factor of 1·05. In contrast, the new method produced a safety factor of 0·95. ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.1989.39.1.107

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