Documents disponibles écrits par cet auteur

Improvement of problematic soils by lime slurry pressure injection / Alex Wilkinson in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 10 (Octobre 2010) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 10 (Octobre 2010) . - pp. 1459-1468 Titre : Improvement of problematic soils by lime slurry pressure injection : case study Type de document : texte imprimé Auteurs : Alex Wilkinson, Auteur ; Asadul Haque, Auteur ; Jayantha Kodikara, Auteur Année de publication : 2010 Article en page(s) : pp. 1459-1468 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Lime  Fly  ash  Mineralogy  Problematic  soils  Soil  improvement  Soil  stabilization  Swell  behavior  Swelling  material Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Lime slurry pressure injection (LSPI) is a stabilization operation used in problematic soils by transportation industries with the aim of improving the geotechnical properties and bringing excessive maintenance costs to an acceptable standard. This paper presents detailed field and laboratory studies of a lime/fly ash stabilized site at Breeza, NSW, Australia. The mixing of slurry into the soil with depths was investigated by excavating a trench while the improvement of geotechnical properties was determined in detailed field and laboratory tests. Visual observations of the surfaces of an excavated trench showed slurry to be distributed within the shrinkage cracks in the desiccated upper soil horizon whereas slurry was conveyed through planes of hydraulic fracture in the soils at greater depths. Laboratory swell tests on the stabilized soils demonstrated a statistically significant reduction of the intrinsic swell properties in the upper horizon of highly plastic clayey soils by LSPI. A gain in soil strength was observed in cone penetrometer test soundings conducted in stabilized soils. Scanning electron microscope and x-ray diffraction studies proved the underlying physicochemical and cementitious reaction processes in stabilized soils. Aggregation of the soils was observed with the outward diffusion of calcium cations within proximity of slurry seams and resulted in a subdued shrink/swell propensity. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JGGEFK&ONLINE=YES&s [...] [article] Improvement of problematic soils by lime slurry pressure injection : case study [texte imprimé] / Alex Wilkinson, Auteur ; Asadul Haque, Auteur ; Jayantha Kodikara, Auteur . - 2010 . - pp. 1459-1468. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 10 (Octobre 2010) . - pp. 1459-1468 Mots-clés : Lime  Fly  ash  Mineralogy  Problematic  soils  Soil  improvement  Soil  stabilization  Swell  behavior  Swelling  material Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Lime slurry pressure injection (LSPI) is a stabilization operation used in problematic soils by transportation industries with the aim of improving the geotechnical properties and bringing excessive maintenance costs to an acceptable standard. This paper presents detailed field and laboratory studies of a lime/fly ash stabilized site at Breeza, NSW, Australia. The mixing of slurry into the soil with depths was investigated by excavating a trench while the improvement of geotechnical properties was determined in detailed field and laboratory tests. Visual observations of the surfaces of an excavated trench showed slurry to be distributed within the shrinkage cracks in the desiccated upper soil horizon whereas slurry was conveyed through planes of hydraulic fracture in the soils at greater depths. Laboratory swell tests on the stabilized soils demonstrated a statistically significant reduction of the intrinsic swell properties in the upper horizon of highly plastic clayey soils by LSPI. A gain in soil strength was observed in cone penetrometer test soundings conducted in stabilized soils. Scanning electron microscope and x-ray diffraction studies proved the underlying physicochemical and cementitious reaction processes in stabilized soils. Aggregation of the soils was observed with the outward diffusion of calcium cations within proximity of slurry seams and resulted in a subdued shrink/swell propensity. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JGGEFK&ONLINE=YES&s [...]

Influence of cyclic stress pulse shapes on filtration behavior of railway subballast / Asadul Haque in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 2 (Fevrier 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 2 (Fevrier 2012) . - pp. 230-235 Titre : Influence of cyclic stress pulse shapes on filtration behavior of railway subballast Type de document : texte imprimé Auteurs : Asadul Haque, Auteur ; Abdelmalek Bouazza, Auteur Année de publication : 2012 Article en page(s) : pp. 230-235 Note générale : géotechnique Langues : Anglais (eng) Mots-clés : Cyclic  load  Stress  pulse  Sub-ballast  Laboratory  tests Résumé : Filtration behavior of subballast materials subjected to different cyclic stress pulse shapes at frequencies of 5 Hz and 10 Hz was investigated in the laboratory. Clayey silt was used as a base soil while graded crushed basalt was used as a filter. Rectangular, sinusoidal, and triangular cyclic stress pulse shapes having a stress range of 70–140 kPa were investigated for a piping ratio of 9. Turbidity, permeability, and change of pore water pressure within base soil were recorded over time as the number of stress pulse cycles increased. Results show that triangular and sinusoidal cyclic stress pulse shapes have a similar effect on the filtration behavior while the rectangular cyclic pulse shape had a slightly higher effect than triangular and sinusoidal stress pulse shapes. Based on this study, a piping ratio of 9 was found to be satisfactory for all cyclic stress pulse shapes at 5 Hz. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v138/i2/p230_s1?isAuthorized=no [article] Influence of cyclic stress pulse shapes on filtration behavior of railway subballast [texte imprimé] / Asadul Haque, Auteur ; Abdelmalek Bouazza, Auteur . - 2012 . - pp. 230-235. géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 2 (Fevrier 2012) . - pp. 230-235 Mots-clés : Cyclic  load  Stress  pulse  Sub-ballast  Laboratory  tests Résumé : Filtration behavior of subballast materials subjected to different cyclic stress pulse shapes at frequencies of 5 Hz and 10 Hz was investigated in the laboratory. Clayey silt was used as a base soil while graded crushed basalt was used as a filter. Rectangular, sinusoidal, and triangular cyclic stress pulse shapes having a stress range of 70–140 kPa were investigated for a piping ratio of 9. Turbidity, permeability, and change of pore water pressure within base soil were recorded over time as the number of stress pulse cycles increased. Results show that triangular and sinusoidal cyclic stress pulse shapes have a similar effect on the filtration behavior while the rectangular cyclic pulse shape had a slightly higher effect than triangular and sinusoidal stress pulse shapes. Based on this study, a piping ratio of 9 was found to be satisfactory for all cyclic stress pulse shapes at 5 Hz. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v138/i2/p230_s1?isAuthorized=no

Theoretical p-y curves for laterally loaded single piles in undrained clay using bezier curves / Jayantha Kodikara in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 1 (Janvier 2010) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 1 (Janvier 2010) . - pp. 265-268 Titre : Theoretical p-y curves for laterally loaded single piles in undrained clay using bezier curves Type de document : texte imprimé Auteurs : Jayantha Kodikara, Auteur ; Asadul Haque, Auteur ; Kah Ying Lee, Auteur Article en page(s) : pp. 265-268 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Pile  foundations  Clays  Lateral  loads  Theories Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : An alternative method was introduced for predicting the nonlinear p-y curves for monotonic unidirectional laterally loaded single piles in uniform undrained clay. On the basis of numerical studies, closed-form solutions were developed for locating the start of yield (ye); the ultimate yield point (yu); and the initial stiffness, Ki of the p-y curve. The nonlinear section of the curve between the start of the yield and the ultimate yield point was represented by Bezier polynomials (also known as de Casteljau's algorithm). Using these relationships, a direct method of constructing the p-y curves was presented considering either tension failure or no tension failure of soils. For a typical pile configuration, the resulting load-deflection response was observed to compare favorably with the predictions from FLAC analysis and Matlock. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JGGEFK&ONLINE=YES&s [...] [article] Theoretical p-y curves for laterally loaded single piles in undrained clay using bezier curves [texte imprimé] / Jayantha Kodikara, Auteur ; Asadul Haque, Auteur ; Kah Ying Lee, Auteur . - pp. 265-268. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 1 (Janvier 2010) . - pp. 265-268 Mots-clés : Pile  foundations  Clays  Lateral  loads  Theories Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : An alternative method was introduced for predicting the nonlinear p-y curves for monotonic unidirectional laterally loaded single piles in uniform undrained clay. On the basis of numerical studies, closed-form solutions were developed for locating the start of yield (ye); the ultimate yield point (yu); and the initial stiffness, Ki of the p-y curve. The nonlinear section of the curve between the start of the yield and the ultimate yield point was represented by Bezier polynomials (also known as de Casteljau's algorithm). Using these relationships, a direct method of constructing the p-y curves was presented considering either tension failure or no tension failure of soils. For a typical pile configuration, the resulting load-deflection response was observed to compare favorably with the predictions from FLAC analysis and Matlock. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JGGEFK&ONLINE=YES&s [...]