Documents disponibles écrits par cet auteur

Efficient evaluation of reliability for slopes with circular slip surfaces using importance sampling / Jianye Ching in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 6 (Juin 2009) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 6 (Juin 2009) . - pp. 768–777 Titre : Efficient evaluation of reliability for slopes with circular slip surfaces using importance sampling Type de document : texte imprimé Auteurs : Jianye Ching, Auteur ; Phoon, Kok-Kwang, Auteur ; Yu-Gang Hu, Auteur Année de publication : 2009 Article en page(s) : pp. 768–777 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Slope  stability  Monte  Carlo  method  System  reliability  Sampling Résumé : Evaluating the reliability of a slope is a challenging task because the possible slip surface is not known beforehand. Approximate methods via the first-order reliability method provide efficient ways of evaluating failure probability of the “most probable” failure surface. The tradeoff is that the failure probability estimates may be biased towards the unconservative side. The Monte Carlo simulation (MCS) is a viable unbiased way of estimating the failure probability of a slope, but MCS is inefficient for problems with small failure probabilities. This study proposes a novel way based on the importance sampling technique of estimating slope reliability that is unbiased and yet is much more efficient than MCS. In particular, the critical issue of the specification of the importance sampling probability density function will be addressed in detail. Three examples of slope reliability will be used to demonstrate the performance of the new method. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000035 [article] Efficient evaluation of reliability for slopes with circular slip surfaces using importance sampling [texte imprimé] / Jianye Ching, Auteur ; Phoon, Kok-Kwang, Auteur ; Yu-Gang Hu, Auteur . - 2009 . - pp. 768–777. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 6 (Juin 2009) . - pp. 768–777 Mots-clés : Slope  stability  Monte  Carlo  method  System  reliability  Sampling Résumé : Evaluating the reliability of a slope is a challenging task because the possible slip surface is not known beforehand. Approximate methods via the first-order reliability method provide efficient ways of evaluating failure probability of the “most probable” failure surface. The tradeoff is that the failure probability estimates may be biased towards the unconservative side. The Monte Carlo simulation (MCS) is a viable unbiased way of estimating the failure probability of a slope, but MCS is inefficient for problems with small failure probabilities. This study proposes a novel way based on the importance sampling technique of estimating slope reliability that is unbiased and yet is much more efficient than MCS. In particular, the critical issue of the specification of the importance sampling probability density function will be addressed in detail. Three examples of slope reliability will be used to demonstrate the performance of the new method. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000035

Observations on limit equilibrium–based slope reliability problems with inclined weak seams / Jianye Ching in Journal of engineering mechanics, Vol. 136 N° 10 (Octobre 2010) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 136 N° 10 (Octobre 2010) . - pp.1220-1233 Titre : Observations on limit equilibrium–based slope reliability problems with inclined weak seams Type de document : texte imprimé Auteurs : Jianye Ching, Auteur ; Phoon, Kok-Kwang, Auteur ; Yu-Gang Hu, Auteur Année de publication : 2010 Article en page(s) : pp.1220-1233 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Slope  stability  Monte  Carlo  method  Reliability  Sampling  Limit  equilibrium. Résumé : This study addresses the complexity of slope reliability problems based on limit equilibrium methods (LEMs). The main focus is on the existence of multiple failure modes that poses difficulty to many LEM-based slope reliability methods. In particular, when weak seams are present, the failure modes associated with those seams may be difficult to detect. A systematic way of searching the failure modes is proposed, and its robustness over slopes with or without weak seams is demonstrated. It is found that in the presence of weak seams, assuming circular slip surfaces may cause underestimation of slope failure probability. The conclusion of the study promotes the use of finite elements as the stability method for reliability evaluation because it is not necessary to search for failure surfaces in finite-element stability analysis. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v136/i10/p1220_s1?isAuthorized=no [article] Observations on limit equilibrium–based slope reliability problems with inclined weak seams [texte imprimé] / Jianye Ching, Auteur ; Phoon, Kok-Kwang, Auteur ; Yu-Gang Hu, Auteur . - 2010 . - pp.1220-1233. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 136 N° 10 (Octobre 2010) . - pp.1220-1233 Mots-clés : Slope  stability  Monte  Carlo  method  Reliability  Sampling  Limit  equilibrium. Résumé : This study addresses the complexity of slope reliability problems based on limit equilibrium methods (LEMs). The main focus is on the existence of multiple failure modes that poses difficulty to many LEM-based slope reliability methods. In particular, when weak seams are present, the failure modes associated with those seams may be difficult to detect. A systematic way of searching the failure modes is proposed, and its robustness over slopes with or without weak seams is demonstrated. It is found that in the presence of weak seams, assuming circular slip surfaces may cause underestimation of slope failure probability. The conclusion of the study promotes the use of finite elements as the stability method for reliability evaluation because it is not necessary to search for failure surfaces in finite-element stability analysis. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v136/i10/p1220_s1?isAuthorized=no