Documents disponibles écrits par cet auteur

Analysis for long-term response of pipes installed using horizontal directional drilling / A. G. Chehab in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 4 (Avril 2012) . - pp. 432–440 Titre : Analysis for long-term response of pipes installed using horizontal directional drilling Type de document : texte imprimé Auteurs : A. G. Chehab, Auteur ; I. D. Moore, Auteur Année de publication : 2012 Article en page(s) : pp. 432–440 Note générale : Géologie appliquée Langues : Anglais (eng) Mots-clés : Directional  drilling  Axial  force  Strength  Service  life  Creep  Relaxation  Polyethyle Résumé : Estimation of the pulling forces during installation is an important step in the successful design of a horizontal directional drilling project. Moreover, estimation of the postinstallation loads is important for the prediction of the long-term performance of the installed pipe. An algorithm is developed to calculate the short and long-term response of steel (elastic) and polymeric (viscoelastic and viscoplastic) pipes installed using horizontal directional drilling. The program simulates the movement of the pulling head, calculates the installation loads, and employs nonlinear, time-dependent constitutive models to calculate the polyethylene pipe response. The program is evaluated by comparing its calculations with known solutions, as well as with other commonly used load estimation methods. After evaluation, the analysis is used to analyze a typical horizontal directional drilling installation. It is shown that the pipe experiences cyclic response during installation and a combination of creep and stress relaxation in the long-term. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000608 [article] Analysis for long-term response of pipes installed using horizontal directional drilling [texte imprimé] / A. G. Chehab, Auteur ; I. D. Moore, Auteur . - 2012 . - pp. 432–440. Géologie appliquée Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 4 (Avril 2012) . - pp. 432–440 Mots-clés : Directional  drilling  Axial  force  Strength  Service  life  Creep  Relaxation  Polyethyle Résumé : Estimation of the pulling forces during installation is an important step in the successful design of a horizontal directional drilling project. Moreover, estimation of the postinstallation loads is important for the prediction of the long-term performance of the installed pipe. An algorithm is developed to calculate the short and long-term response of steel (elastic) and polymeric (viscoelastic and viscoplastic) pipes installed using horizontal directional drilling. The program simulates the movement of the pulling head, calculates the installation loads, and employs nonlinear, time-dependent constitutive models to calculate the polyethylene pipe response. The program is evaluated by comparing its calculations with known solutions, as well as with other commonly used load estimation methods. After evaluation, the analysis is used to analyze a typical horizontal directional drilling installation. It is shown that the pipe experiences cyclic response during installation and a combination of creep and stress relaxation in the long-term. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000608

Earth pressure measurements on buried HDPE pipe / M. L. Talesnick in Géotechnique, Vol. 61 N° 9 (Septembre 2011) 

Public ISBD [article]  in Géotechnique > Vol. 61 N° 9 (Septembre 2011) . - pp. 721-732 Titre : Earth pressure measurements on buried HDPE pipe Type de document : texte imprimé Auteurs : M. L. Talesnick, Auteur ; H.-W. Xia, Auteur ; I. D. Moore, Auteur Année de publication : 2011 Article en page(s) : pp. 721-732 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Full-scale  tests  Soil–structure  interaction  Theoretical  analysis  Sands Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : An understanding of the stress distributions that act on buried pipes plays a key role in the development and use of design methods for these structures. The radial stresses that develop on buried flexible pipes have been investigated by a number of researchers through experimental, analytical and numerical methods. However, direct measurements of soil contact stresses acting on small-diameter pipes have not been possible, since commercial earth pressure cells are large, and the stiffness of the cell relative to the soil material is known to influence the measured stresses. A new technique is described for measuring the radial contact stresses acting on buried pipes, and experimental studies are reported that demonstrate the effectiveness of this new technique for measuring contact pressures for both loose and compacted sand backfills. Comparison of the measurements with computations from elastic soil–pipe interaction theory reveals significant discrepancies in the magnitude and distribution of radial pressure around the circumference of the pipe for both loose and compacted backfill conditions. The new measurement technology provides direct support for pressure distributions inferred in earlier studies from measurements of circumferential strains around the pipe circumference. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.8.p.048 [article] Earth pressure measurements on buried HDPE pipe [texte imprimé] / M. L. Talesnick, Auteur ; H.-W. Xia, Auteur ; I. D. Moore, Auteur . - 2011 . - pp. 721-732. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 61 N° 9 (Septembre 2011) . - pp. 721-732 Mots-clés : Full-scale  tests  Soil–structure  interaction  Theoretical  analysis  Sands Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : An understanding of the stress distributions that act on buried pipes plays a key role in the development and use of design methods for these structures. The radial stresses that develop on buried flexible pipes have been investigated by a number of researchers through experimental, analytical and numerical methods. However, direct measurements of soil contact stresses acting on small-diameter pipes have not been possible, since commercial earth pressure cells are large, and the stiffness of the cell relative to the soil material is known to influence the measured stresses. A new technique is described for measuring the radial contact stresses acting on buried pipes, and experimental studies are reported that demonstrate the effectiveness of this new technique for measuring contact pressures for both loose and compacted sand backfills. Comparison of the measurements with computations from elastic soil–pipe interaction theory reveals significant discrepancies in the magnitude and distribution of radial pressure around the circumference of the pipe for both loose and compacted backfill conditions. The new measurement technology provides direct support for pressure distributions inferred in earlier studies from measurements of circumferential strains around the pipe circumference. DEWEY : 624.15 ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.8.p.048

Earth pressure measurements on buried HDPE pipe / M. L. Talesnick in Géotechnique, Vol. 62 N° 12 (Décembre 2012) 

Public ISBD [article]  in Géotechnique > Vol. 62 N° 12 (Décembre 2012) . - pp. 1139 –1142 Titre : Earth pressure measurements on buried HDPE pipe Type de document : texte imprimé Auteurs : M. L. Talesnick, Auteur ; H.-W. Xia, Auteur ; I. D. Moore, Auteur Année de publication : 2012 Article en page(s) : pp. 1139 –1142 Note générale : Génie Civil Langues : Anglais (eng) Note de contenu : Discussion ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.12.D.002 [article] Earth pressure measurements on buried HDPE pipe [texte imprimé] / M. L. Talesnick, Auteur ; H.-W. Xia, Auteur ; I. D. Moore, Auteur . - 2012 . - pp. 1139 –1142. Génie Civil Langues : Anglais (eng) in Géotechnique > Vol. 62 N° 12 (Décembre 2012) . - pp. 1139 –1142 Note de contenu : Discussion ISSN : 0016-8505 En ligne : http://www.icevirtuallibrary.com/content/article/10.1680/geot.12.D.002

Ground displacements from a pipe-bursting experiment in well-graded sand and gravel / J. A. Cholewa in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 11 (Novembre 2009) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 11 (Novembre 2009) . - pp. 1713–1721 Titre : Ground displacements from a pipe-bursting experiment in well-graded sand and gravel Type de document : texte imprimé Auteurs : J. A. Cholewa, Auteur ; R. W. I. Brachman, Auteur ; I. D. Moore, Auteur Année de publication : 2009 Article en page(s) : pp. 1713–1721 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Trenchless  technologyLaboratory  testsBuried  pipesSandSoil  typeGravelDisplacement Résumé : Pipe bursting is a construction technique that involves the replacement of an existing buried pipe with potentially much less surface disturbance than traditional cut and cover construction. However, excessive ground movements associated with pipe-bursting operations may lead to damage to surrounding infrastructure. A static pipe-bursting experiment was performed in sand and gravel within an 8-m-long, 8-m-wide, and 3-m-deep test pit to quantify the ground displacements from pipe bursting. An existing unreinforced concrete pipe buried 1.385 m below the ground surface was replaced with a high-density polyethylene pipe. Pulling force and the three-dimensional nature of surface displacements associated with pipe bursting are examined. The 4-m wide surface response had a peak vertical displacement of 6 mm. In addition, transverse displacements of 1.2 mm resulted in the formation of a tension crack in the ground above the concrete pipe. This experiment offers data that improves the understanding of the mechanisms of ground disturbance, and provides unique experimental data for calibration of numerical models. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000117 [article] Ground displacements from a pipe-bursting experiment in well-graded sand and gravel [texte imprimé] / J. A. Cholewa, Auteur ; R. W. I. Brachman, Auteur ; I. D. Moore, Auteur . - 2009 . - pp. 1713–1721. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 11 (Novembre 2009) . - pp. 1713–1721 Mots-clés : Trenchless  technologyLaboratory  testsBuried  pipesSandSoil  typeGravelDisplacement Résumé : Pipe bursting is a construction technique that involves the replacement of an existing buried pipe with potentially much less surface disturbance than traditional cut and cover construction. However, excessive ground movements associated with pipe-bursting operations may lead to damage to surrounding infrastructure. A static pipe-bursting experiment was performed in sand and gravel within an 8-m-long, 8-m-wide, and 3-m-deep test pit to quantify the ground displacements from pipe bursting. An existing unreinforced concrete pipe buried 1.385 m below the ground surface was replaced with a high-density polyethylene pipe. Pulling force and the three-dimensional nature of surface displacements associated with pipe bursting are examined. The 4-m wide surface response had a peak vertical displacement of 6 mm. In addition, transverse displacements of 1.2 mm resulted in the formation of a tension crack in the ground above the concrete pipe. This experiment offers data that improves the understanding of the mechanisms of ground disturbance, and provides unique experimental data for calibration of numerical models. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000117

Response of a polyvinyl chloride water pipe when transverse to an underlying pipe replaced by pipe bursting / J. A. Cholewa in Canadian geotechnical journal, Vol. 46 N° 11 (Novembre 2009) 

Public ISBD [article]  in Canadian geotechnical journal > Vol. 46 N° 11 (Novembre 2009) . - pp. 1258–1266 Titre : Response of a polyvinyl chloride water pipe when transverse to an underlying pipe replaced by pipe bursting Type de document : texte imprimé Auteurs : J. A. Cholewa, Auteur ; R. W. I. Brachman, Auteur ; I. D. Moore, Auteur Article en page(s) : pp. 1258–1266 Note générale : Sciences de la Terre Langues : Anglais (eng) Mots-clés : Pipe  bursting  Adjacent  utility  Displacement  Longitudinal  strain  Laboratory  testing  Eclatement  de  tuyau  Services  adjacents  Déplacement  Déformation  longitudinale  Essais  en  laboratoire Index. décimale : 550 Sciences auxiliaires de la géologie. Résumé : An existing deteriorated or hydraulically undersized pipe can be replaced with a new pipe by static pipe bursting. Cavity expansion during pipe bursting induces ground movements, which may potentially damage nearby buried utilities if they are in close proximity to the pipe bursting operation. A large-scale pipe bursting experiment was performed in an 8 m long, 8 m wide, and 3 m deep test pit filled with a well-graded sand and gravel soil. A polyvinyl chloride (PVC) pipe, crossing transversely and 0.45 m above the existing pipe being replaced, was instrumented with strain gages to quantify the response of that transverse utility to the ground movements associated with pipe bursting. In this paper, the measured strain and corresponding deflection of the PVC pipe are examined and compared with measurements of surface uplift. The maximum longitudinal strain measured in the pipe was less than 0.1% and its vertical diameter decreased by only 0.5%, suggesting that ground displacements induced by pipe bursting did not jeopardize the transverse water pipe’s long-term performance, provided its joints were not damaged. A simplified design equation is introduced and shown to provide estimates of maximum longitudinal strain in the PVC pipe close to those measured during the laboratory experiment. Un tuyau existant trop petit ou détérioré peu être remplacé par un nouveau tuyau par la méthode de l’éclatement statique du tuyau. L’expansion de la cavité pendant l’éclatement du tuyau provoque des mouvements dans le sol qui peuvent potentiellement causer des dommages aux services enfouis s’ils sont près de l’opération d’éclatement du tuyau. Un essai à grande échelle d’éclatement du tuyau a été effectué dans une fosse d’essai de 8 m de longueur, 8 m de largeur et 3 m de profondeur remplie avec du sable non uniforme et du gravier. Un tuyau de chlorure de polyvinyle (« PVC ») placé 0,45 m (transversal) au-dessus du tuyau à changer a été instrumenté afin de quantifier le comportement de tuyaux de services transversaux lors de du remplacement d’un tuyau adjacent par la méthode de l’éclatement du tuyau. Les déformations mesurées et les déflections correspondantes sur le tuyau de PVC sont examinées et comparées aux mesures de soulèvement de la surface. La déformation longitudinale maximale mesurée sur le tuyau était inférieure à 0,1 % et son diamètre vertical s’est réduit de seulement 0,5 %, ce qui indique que les déplacements du sol causés par l’éclatement du tuyau n’ont pas mis en danger les performances à long terme du tuyau d’eau, en supposant que ses joints n’ont pas été endommagés. Une équation de conception simplifiée est présentée et démontre qu’elle permet d’obtenir des estimations des déformations longitudinales maximales dans le tuyau de chlorure de polyvinyle qui sont près de celles mesurées en laboratoire. DEWEY : 550 ISSN : 0008-3674 En ligne : http://rparticle.web-p.cisti.nrc.ca/rparticle/AbstractTemplateServlet?calyLang=f [...] [article] Response of a polyvinyl chloride water pipe when transverse to an underlying pipe replaced by pipe bursting [texte imprimé] / J. A. Cholewa, Auteur ; R. W. I. Brachman, Auteur ; I. D. Moore, Auteur . - pp. 1258–1266. Sciences de la Terre Langues : Anglais (eng) in Canadian geotechnical journal > Vol. 46 N° 11 (Novembre 2009) . - pp. 1258–1266 Mots-clés : Pipe  bursting  Adjacent  utility  Displacement  Longitudinal  strain  Laboratory  testing  Eclatement  de  tuyau  Services  adjacents  Déplacement  Déformation  longitudinale  Essais  en  laboratoire Index. décimale : 550 Sciences auxiliaires de la géologie. Résumé : An existing deteriorated or hydraulically undersized pipe can be replaced with a new pipe by static pipe bursting. Cavity expansion during pipe bursting induces ground movements, which may potentially damage nearby buried utilities if they are in close proximity to the pipe bursting operation. A large-scale pipe bursting experiment was performed in an 8 m long, 8 m wide, and 3 m deep test pit filled with a well-graded sand and gravel soil. A polyvinyl chloride (PVC) pipe, crossing transversely and 0.45 m above the existing pipe being replaced, was instrumented with strain gages to quantify the response of that transverse utility to the ground movements associated with pipe bursting. In this paper, the measured strain and corresponding deflection of the PVC pipe are examined and compared with measurements of surface uplift. The maximum longitudinal strain measured in the pipe was less than 0.1% and its vertical diameter decreased by only 0.5%, suggesting that ground displacements induced by pipe bursting did not jeopardize the transverse water pipe’s long-term performance, provided its joints were not damaged. A simplified design equation is introduced and shown to provide estimates of maximum longitudinal strain in the PVC pipe close to those measured during the laboratory experiment. Un tuyau existant trop petit ou détérioré peu être remplacé par un nouveau tuyau par la méthode de l’éclatement statique du tuyau. L’expansion de la cavité pendant l’éclatement du tuyau provoque des mouvements dans le sol qui peuvent potentiellement causer des dommages aux services enfouis s’ils sont près de l’opération d’éclatement du tuyau. Un essai à grande échelle d’éclatement du tuyau a été effectué dans une fosse d’essai de 8 m de longueur, 8 m de largeur et 3 m de profondeur remplie avec du sable non uniforme et du gravier. Un tuyau de chlorure de polyvinyle (« PVC ») placé 0,45 m (transversal) au-dessus du tuyau à changer a été instrumenté afin de quantifier le comportement de tuyaux de services transversaux lors de du remplacement d’un tuyau adjacent par la méthode de l’éclatement du tuyau. Les déformations mesurées et les déflections correspondantes sur le tuyau de PVC sont examinées et comparées aux mesures de soulèvement de la surface. La déformation longitudinale maximale mesurée sur le tuyau était inférieure à 0,1 % et son diamètre vertical s’est réduit de seulement 0,5 %, ce qui indique que les déplacements du sol causés par l’éclatement du tuyau n’ont pas mis en danger les performances à long terme du tuyau d’eau, en supposant que ses joints n’ont pas été endommagés. Une équation de conception simplifiée est présentée et démontre qu’elle permet d’obtenir des estimations des déformations longitudinales maximales dans le tuyau de chlorure de polyvinyle qui sont près de celles mesurées en laboratoire. DEWEY : 550 ISSN : 0008-3674 En ligne : http://rparticle.web-p.cisti.nrc.ca/rparticle/AbstractTemplateServlet?calyLang=f [...]

Study of nonuniform bedding support because of erosion under cast iron water distribution pipes / M. Balkaya in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 10 (Octobre 2012) 

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