Documents disponibles écrits par cet auteur

Modification to translational failure analysis of landfills incorporating seismicity / Xuede Qian in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 5 (Mai 2010) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 5 (Mai 2010) . - pp. 718-727 Titre : Modification to translational failure analysis of landfills incorporating seismicity Type de document : texte imprimé Auteurs : Xuede Qian, Auteur ; Robert M. Koerner, Auteur Année de publication : 2010 Article en page(s) : pp. 718-727 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Landfill  stability  Translational  failure  Liner  interface  Earthquake  Seismic  yield  coefficient Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper extends a previously developed method of the writers by using a pseudostatic approach to conduct seismic stability analysis for potential translational failures of multilayer lined landfills. Assuming that the designed seismic coefficient, ks, is known, the factor of safety against translational failure for lined landfills can be calculated from the new developed equations. The critical interface with the seismic yield coefficient, ky, is generally located at different interfaces along the back slope and along the base. The failure surface is seen to transfer from one interface to another with changes of dimensions of the top width, depth, and front slope of the waste mass. Using this method, a waste filling sequence can be generated so as to maintain the ky-value above a stipulated value during landfill operations. It is important to ensure that the minimum ky-value at the critical interface is always equal to or greater than a targeted value during the waste filling sequence and after closure corresponding to the different geometric dimensions of the waste mass. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i5/p718_s1?isAuthorized=no [article] Modification to translational failure analysis of landfills incorporating seismicity [texte imprimé] / Xuede Qian, Auteur ; Robert M. Koerner, Auteur . - 2010 . - pp. 718-727. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 5 (Mai 2010) . - pp. 718-727 Mots-clés : Landfill  stability  Translational  failure  Liner  interface  Earthquake  Seismic  yield  coefficient Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This paper extends a previously developed method of the writers by using a pseudostatic approach to conduct seismic stability analysis for potential translational failures of multilayer lined landfills. Assuming that the designed seismic coefficient, ks, is known, the factor of safety against translational failure for lined landfills can be calculated from the new developed equations. The critical interface with the seismic yield coefficient, ky, is generally located at different interfaces along the back slope and along the base. The failure surface is seen to transfer from one interface to another with changes of dimensions of the top width, depth, and front slope of the waste mass. Using this method, a waste filling sequence can be generated so as to maintain the ky-value above a stipulated value during landfill operations. It is important to ensure that the minimum ky-value at the critical interface is always equal to or greater than a targeted value during the waste filling sequence and after closure corresponding to the different geometric dimensions of the waste mass. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i5/p718_s1?isAuthorized=no

Stability analysis when using an engineered berm to increase landfill space / Xuede Qian in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 8 (Août 2009) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 8 (Août 2009) . - pp. 1082–1091 Titre : Stability analysis when using an engineered berm to increase landfill space Type de document : texte imprimé Auteurs : Xuede Qian, Auteur ; Robert M. Koerner, Auteur Année de publication : 2009 Article en page(s) : pp. 1082–1091 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Landfills  Failures  Friction  Shear  strength  Berms Résumé : The scope of this paper is to develop a new three-part wedge method to analyze translational failure when using an engineered berm to increase landfill space. The possible failure face may pass over the back slope of the berm or pass under the bottom of the berm. This depends on the geometric dimensions of the berm which in turn influences the amount of airspace gained. Each possible failure condition must be checked to make sure both the waste mass and berm remain stable. If the waste boundary is kept to be unchanged, FSover will increase and FSunder will decrease with increase of the back slope of the berm. The critical failure condition may be changed from passing over to passing under the berm by changing the back slope of the berm. If the location of the front toe of the berm is fixed, both FSover and FSunder increase with increased height of the berm, however, the critical failure condition will change from passing under the berm to passing over the berm. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000065 [article] Stability analysis when using an engineered berm to increase landfill space [texte imprimé] / Xuede Qian, Auteur ; Robert M. Koerner, Auteur . - 2009 . - pp. 1082–1091. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 8 (Août 2009) . - pp. 1082–1091 Mots-clés : Landfills  Failures  Friction  Shear  strength  Berms Résumé : The scope of this paper is to develop a new three-part wedge method to analyze translational failure when using an engineered berm to increase landfill space. The possible failure face may pass over the back slope of the berm or pass under the bottom of the berm. This depends on the geometric dimensions of the berm which in turn influences the amount of airspace gained. Each possible failure condition must be checked to make sure both the waste mass and berm remain stable. If the waste boundary is kept to be unchanged, FSover will increase and FSunder will decrease with increase of the back slope of the berm. The critical failure condition may be changed from passing over to passing under the berm by changing the back slope of the berm. If the location of the front toe of the berm is fixed, both FSover and FSunder increase with increased height of the berm, however, the critical failure condition will change from passing under the berm to passing over the berm. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000065