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Effects of geocell confinement on strength and deformation behavior of gravel / Ben Leshchinsky in Journal of geotechnical and geoenvironmental engineering, Vol. 139 N° 2 (Février 2013) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 2 (Février 2013) . - pp. 340-352 Titre : Effects of geocell confinement on strength and deformation behavior of gravel Type de document : texte imprimé Auteurs : Ben Leshchinsky, Auteur ; Ling, Hoe, Auteur Année de publication : 2013 Article en page(s) : pp. 340-352 Note générale : geotechnique Langues : Anglais (eng) Mots-clés : gravel;  railroad  tracks;  confinement;  deformation;  laboratory  tests;  finite  element  method;  parameters Résumé : In past years, railroad transportation has been of growing interest because of its efficiency and advancement in railway technologies. However, many issues arise because of the variability in subsurface conditions along the sizeable lengths of track that exist. One very important issue is the need for significant upkeep and maintenance for railways passing over areas of poor soil conditions as a result of continuous deformation and a lack of stiffness from the foundation. One general solution for lack of substructure integrity has been confinement, applied through a variety of reinforcement types, including geocell. To investigate the effectiveness of geocell confinement on substructure integrity, a series of embankment model tests with different configurations of geocell placement (one layer and two layers of geocell) were constructed and loaded monotonically and cyclically for comparison with unreinforced, control tests. On the completion of these tests, the model embankments were simulated numerically using finite-element procedures. The results, which matched reasonably well, were then used as validation for a parametric study, observing the effects of less competent geocell material, gravel, and foundation conditions and their implications. The tests and numerical simulations demonstrate that geocell confinement effectively increased stiffness and strength of a gravel embankment while reducing vertical settlement and lateral spreading. Additionally, the parametric study shows that the use of geocell provides a composite mattressing effect that distributes subgrade stress more uniformly than without reinforcement, increasing bearing capacity and reducing settlement, especially on soft foundations. The results suggested that in some site conditions, use of geocell might be an economical alternative to frequent maintenance and/or lower train speeds. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000757 [article] Effects of geocell confinement on strength and deformation behavior of gravel [texte imprimé] / Ben Leshchinsky, Auteur ; Ling, Hoe, Auteur . - 2013 . - pp. 340-352. geotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 2 (Février 2013) . - pp. 340-352 Mots-clés : gravel;  railroad  tracks;  confinement;  deformation;  laboratory  tests;  finite  element  method;  parameters Résumé : In past years, railroad transportation has been of growing interest because of its efficiency and advancement in railway technologies. However, many issues arise because of the variability in subsurface conditions along the sizeable lengths of track that exist. One very important issue is the need for significant upkeep and maintenance for railways passing over areas of poor soil conditions as a result of continuous deformation and a lack of stiffness from the foundation. One general solution for lack of substructure integrity has been confinement, applied through a variety of reinforcement types, including geocell. To investigate the effectiveness of geocell confinement on substructure integrity, a series of embankment model tests with different configurations of geocell placement (one layer and two layers of geocell) were constructed and loaded monotonically and cyclically for comparison with unreinforced, control tests. On the completion of these tests, the model embankments were simulated numerically using finite-element procedures. The results, which matched reasonably well, were then used as validation for a parametric study, observing the effects of less competent geocell material, gravel, and foundation conditions and their implications. The tests and numerical simulations demonstrate that geocell confinement effectively increased stiffness and strength of a gravel embankment while reducing vertical settlement and lateral spreading. Additionally, the parametric study shows that the use of geocell provides a composite mattressing effect that distributes subgrade stress more uniformly than without reinforcement, increasing bearing capacity and reducing settlement, especially on soft foundations. The results suggested that in some site conditions, use of geocell might be an economical alternative to frequent maintenance and/or lower train speeds. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000757