Subgrade undercut criteria based on modeling of rutting and pumping response / Young Jin Park in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 10 (Octobre 2012)  

Public ISBD [article]  inJournal of geotechnical and geoenvironmental engineering > Vol. 138 N° 10 (Octobre 2012) . - pp.1175–1184. Titre : Subgrade undercut criteria based on modeling of rutting and pumping response Type de document : texte imprimé Auteurs : Young Jin Park, Auteur ; Mohammed A. Gabr, Auteur ; Brent R. Robinson, Auteur Année de publication : 2013 Article en page(s) : pp.1175–1184. Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Dynamic cone penetration Finite-difference method Proof roll Pumping Rutting Stiffness Soft soil Strength subgrades Undercut criteria Résumé : The stability of subgrade soils is a major concern during roadway construction with inappropriately soft layers often undercut and replaced by competent or stabilized materials. Systematic undercut criteria are established using numerical modeling with varying the strength and stiffness parameters of the subgrade and representing the mechanistic behavior as an elastic-perfectly plastic medium. Two modes of domain configurations were considered: the plane strain and axisymmetric conditions. The plane strain mode is assumed to simulate proof roller loading with four parallel tires and mainly provides information about excessive pumping response as materials at deeper layers are affected. The axisymmetric mode provides information related to excessive rutting and is used to simulate the effect of single or dual tires representing construction traffic, rather than a series of closely spaced axle loads. Undercut criteria are proposed for meeting a deformation limit state of 25 mm for both pumping and rutting, with the additional requirement of a performance capacity ratio (PCR) of 1.5. The proposed criteria are applied to data from four field cases in which decisions were made regarding the need for undercutting, and the applicability of the criteria is discussed. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000695 [article] Subgrade undercut criteria based on modeling of rutting and pumping response [texte imprimé] / Young Jin Park, Auteur ; Mohammed A. Gabr, Auteur ; Brent R. Robinson, Auteur . - 2013 . - pp.1175–1184. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 10 (Octobre 2012) . - pp.1175–1184. Mots-clés : Dynamic cone penetration Finite-difference method Proof roll Pumping Rutting Stiffness Soft soil Strength subgrades Undercut criteria Résumé : The stability of subgrade soils is a major concern during roadway construction with inappropriately soft layers often undercut and replaced by competent or stabilized materials. Systematic undercut criteria are established using numerical modeling with varying the strength and stiffness parameters of the subgrade and representing the mechanistic behavior as an elastic-perfectly plastic medium. Two modes of domain configurations were considered: the plane strain and axisymmetric conditions. The plane strain mode is assumed to simulate proof roller loading with four parallel tires and mainly provides information about excessive pumping response as materials at deeper layers are affected. The axisymmetric mode provides information related to excessive rutting and is used to simulate the effect of single or dual tires representing construction traffic, rather than a series of closely spaced axle loads. Undercut criteria are proposed for meeting a deformation limit state of 25 mm for both pumping and rutting, with the additional requirement of a performance capacity ratio (PCR) of 1.5. The proposed criteria are applied to data from four field cases in which decisions were made regarding the need for undercutting, and the applicability of the criteria is discussed. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000695

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