Documents disponibles écrits par cet auteur

Coupled mechanical and hydraulic modeling of geosynthetic-reinforced column-supported embankments / Jie Huang 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. 1011–1021 Titre : Coupled mechanical and hydraulic modeling of geosynthetic-reinforced column-supported embankments Type de document : texte imprimé Auteurs : Jie Huang, Auteur ; Jie Han, Auteur ; Sadik Oztoprak, Auteur Année de publication : 2009 Article en page(s) : pp. 1011–1021 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Geosynthetics  Columns  Embankments  Coupling  Numerical  models  Settlements  Tension  Hydraulic  models Résumé : Geosynthetic-reinforced column-supported (GRCS) embankments have increasingly been used in the recent years for accelerated construction. Numerical analyses have been conducted to improve understanding and knowledge of this complicated embankment system. However, most studies so far have been focused on its short-term or long-term behavior by assuming an undrained or drained condition, which does not consider water flow in saturated soft soil (i.e., consolidation). As a result, very limited attention has been paid to a settlement-time relationship especially postconstruction settlement, which is critical to performance of pavements on embankments or connection between approach embankments and bridge abutments. To investigate the time-dependent behavior, coupled two-dimensional mechanical and hydraulic numerical modeling was conducted in this study to analyze a well-instrumented geotextile-reinforced deep mixed column-supported embankment in Hertsby, Finland. In the mechanical modeling, soils and DM columns were modeled as elastic-plastic materials and a geotextile layer was modeled using cable elements. In the hydraulic modeling, water flow was modeled to simulate generation and dissipation of excess pore water pressures during and after the construction of the embankment. The numerical results with or without modeling water flow were compared with the field data. In addition, parametric studies were conducted to further examine the effects of geosynthetic stiffness, column modulus, and average staged construction rate on the postconstruction settlement and the tension in the geosynthetic reinforcement. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000026 [article] Coupled mechanical and hydraulic modeling of geosynthetic-reinforced column-supported embankments [texte imprimé] / Jie Huang, Auteur ; Jie Han, Auteur ; Sadik Oztoprak, Auteur . - 2009 . - pp. 1011–1021. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 8 (Août 2009) . - pp. 1011–1021 Mots-clés : Geosynthetics  Columns  Embankments  Coupling  Numerical  models  Settlements  Tension  Hydraulic  models Résumé : Geosynthetic-reinforced column-supported (GRCS) embankments have increasingly been used in the recent years for accelerated construction. Numerical analyses have been conducted to improve understanding and knowledge of this complicated embankment system. However, most studies so far have been focused on its short-term or long-term behavior by assuming an undrained or drained condition, which does not consider water flow in saturated soft soil (i.e., consolidation). As a result, very limited attention has been paid to a settlement-time relationship especially postconstruction settlement, which is critical to performance of pavements on embankments or connection between approach embankments and bridge abutments. To investigate the time-dependent behavior, coupled two-dimensional mechanical and hydraulic numerical modeling was conducted in this study to analyze a well-instrumented geotextile-reinforced deep mixed column-supported embankment in Hertsby, Finland. In the mechanical modeling, soils and DM columns were modeled as elastic-plastic materials and a geotextile layer was modeled using cable elements. In the hydraulic modeling, water flow was modeled to simulate generation and dissipation of excess pore water pressures during and after the construction of the embankment. The numerical results with or without modeling water flow were compared with the field data. In addition, parametric studies were conducted to further examine the effects of geosynthetic stiffness, column modulus, and average staged construction rate on the postconstruction settlement and the tension in the geosynthetic reinforcement. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000026

Deep mixing induced property changes in surrounding sensitive marine clays / Shui-Long Shen in Journal of geotechnical and geoenvironmental engineering, Vol. 134 N° 6 (Juin 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N° 6 (Juin 2008) . - pp. 845–854 Titre : Deep mixing induced property changes in surrounding sensitive marine clays Type de document : texte imprimé Auteurs : Shui-Long Shen, Auteur ; Jie Han, Auteur ; Yan-Jun Du, Auteur Année de publication : 2010 Article en page(s) : pp. 845–854 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Soil  mixing  Clays  Field  tests  Soil  properties  Cracking  Shear  strength  Diffusion Résumé : This paper presents a field study of installation effects of deep mixed columns on properties of the sensitive Ariake marine clay. Cone penetration tests were performed in the field to evaluate the change in the strength of the surrounding clay with time. Soil samples were taken before and after column installation to evaluate variations of physical, mechanical, and chemical properties of the surrounding clay. Test results indicated that the water content of the surrounding clay decreased while the concentration of cations increased as sampling locations approached the columns. Shear strength of the surrounding clay decreased during the installation but recovered after a short period of curing. Shear strength continued to increase with time over a period of 70days . Based on the regression results, the surrounding soil after the installation of the columns took approximately 10days to recover to the strength value before installation. On average, the shear strength of the surrounding clay increased over the original strength by approximately 23% after 40days and 50% after 70days , respectively. Discussion is presented on strength changes and key influence factors including soil disturbance and fracturing, thixotropy, consolidation, and diffusion of cations from deep mixed columns to the surrounding clay. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A6%2884 [...] [article] Deep mixing induced property changes in surrounding sensitive marine clays [texte imprimé] / Shui-Long Shen, Auteur ; Jie Han, Auteur ; Yan-Jun Du, Auteur . - 2010 . - pp. 845–854. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N° 6 (Juin 2008) . - pp. 845–854 Mots-clés : Soil  mixing  Clays  Field  tests  Soil  properties  Cracking  Shear  strength  Diffusion Résumé : This paper presents a field study of installation effects of deep mixed columns on properties of the sensitive Ariake marine clay. Cone penetration tests were performed in the field to evaluate the change in the strength of the surrounding clay with time. Soil samples were taken before and after column installation to evaluate variations of physical, mechanical, and chemical properties of the surrounding clay. Test results indicated that the water content of the surrounding clay decreased while the concentration of cations increased as sampling locations approached the columns. Shear strength of the surrounding clay decreased during the installation but recovered after a short period of curing. Shear strength continued to increase with time over a period of 70days . Based on the regression results, the surrounding soil after the installation of the columns took approximately 10days to recover to the strength value before installation. On average, the shear strength of the surrounding clay increased over the original strength by approximately 23% after 40days and 50% after 70days , respectively. Discussion is presented on strength changes and key influence factors including soil disturbance and fracturing, thixotropy, consolidation, and diffusion of cations from deep mixed columns to the surrounding clay. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A6%2884 [...]

Laterally loaded shaft group capacities and deflections behind an MSE wall / Matthew C. Pierson in Journal of geotechnical and geoenvironmental engineering, Vol. 137 N° 10 (Octobre 2011) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 137 N° 10 (Octobre 2011) . - pp. 882-889 Titre : Laterally loaded shaft group capacities and deflections behind an MSE wall Type de document : texte imprimé Auteurs : Matthew C. Pierson, Auteur ; Robert L. Parsons, Auteur ; Jie Han, Auteur Année de publication : 2012 Article en page(s) : pp. 882-889 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Geosynthetics  Drilled  shafts  Retaining  walls  Soil  stabilization  Lateral  loads  Soil  structures  MSE  wall  Group  effect Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Design of laterally loaded cast-in-place shafts that pass through the reinforcement behind a mechanically stabilized earth (MSE) wall often requires isolation of the shafts from the MSE mass and socketing of the shafts into the underlying stable foundation material, such as bedrock. Sizeable cost and time savings could be realized, while maintaining stability if the shaft could be supported by the MSE mass alone with no rock socket. Construction, instrumentation, and testing of multiple 0.9-m-diameter shafts solely supported by the geogrid-reinforced mass behind a 6-m-high MSE block wall were conducted for the Kansas Department of Transportation (KDOT). This paper describes the design, construction, and instrumentation of the wall and shafts and the results from the lateral load tests of three shafts tested together as a group compared with shafts that were tested individually. This testing protocol was adopted to evaluate the shaft group effect and the effect of shaft distance from the back of the wall facing. All shafts discussed had lengths that were equal to the full height of the wall. Results for both load and deflection of the shafts and the deflections of the wall facing during loading are presented with preliminary design recommendations. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v137/i10/p882_s1?isAuthorized=no [article] Laterally loaded shaft group capacities and deflections behind an MSE wall [texte imprimé] / Matthew C. Pierson, Auteur ; Robert L. Parsons, Auteur ; Jie Han, Auteur . - 2012 . - pp. 882-889. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 137 N° 10 (Octobre 2011) . - pp. 882-889 Mots-clés : Geosynthetics  Drilled  shafts  Retaining  walls  Soil  stabilization  Lateral  loads  Soil  structures  MSE  wall  Group  effect Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Design of laterally loaded cast-in-place shafts that pass through the reinforcement behind a mechanically stabilized earth (MSE) wall often requires isolation of the shafts from the MSE mass and socketing of the shafts into the underlying stable foundation material, such as bedrock. Sizeable cost and time savings could be realized, while maintaining stability if the shaft could be supported by the MSE mass alone with no rock socket. Construction, instrumentation, and testing of multiple 0.9-m-diameter shafts solely supported by the geogrid-reinforced mass behind a 6-m-high MSE block wall were conducted for the Kansas Department of Transportation (KDOT). This paper describes the design, construction, and instrumentation of the wall and shafts and the results from the lateral load tests of three shafts tested together as a group compared with shafts that were tested individually. This testing protocol was adopted to evaluate the shaft group effect and the effect of shaft distance from the back of the wall facing. All shafts discussed had lengths that were equal to the full height of the wall. Results for both load and deflection of the shafts and the deflections of the wall facing during loading are presented with preliminary design recommendations. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v137/i10/p882_s1?isAuthorized=no

Uniform laminar wetland flow through submerged and floating plants / Mingdeng Zhao in Journal of hydraulic research, Vol. 50 N° 1 (Janvier/Février 2012) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 50 N° 1 (Janvier/Février 2012) . - pp. 52-59 Titre : Uniform laminar wetland flow through submerged and floating plants Type de document : texte imprimé Auteurs : Mingdeng Zhao, Auteur ; Wenxin Huai, Auteur ; Jie Han, Auteur Année de publication : 2012 Article en page(s) : pp. 52-59 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Habitat  restoration  Laminar  flow  Porous  media  Stormwater  treatment  Vegetation  flow  Wetland Résumé : Wetland flow is currently actively studied because of its applications in stormwater management, wastewater treatment and habitat restoration. This research applies the well-established poroelastic media flow theory to uniform laminar wetland flow through submerged and floating vegetation, where the linear interaction between the pore water and the vegetation skeleton is considered in the equations of motion. The effects of vegetation porosity on the velocity, the shear stress and the energy distributions in different layers are first derived analytically and interpreted graphically and physically. As special cases, the homogeneous water flow, as also floating, submerged and emergent vegetation flows are then discussed. This research provides qualitative understanding of wetland flow on velocity, shear stress and energy distributions, indicating that a plant applies a significant resistance to the flow system and dissipates most of the flow energy. The results serve a benchmark framework for the future study on turbulent vegetation flow. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.641327 [article] Uniform laminar wetland flow through submerged and floating plants [texte imprimé] / Mingdeng Zhao, Auteur ; Wenxin Huai, Auteur ; Jie Han, Auteur . - 2012 . - pp. 52-59. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 50 N° 1 (Janvier/Février 2012) . - pp. 52-59 Mots-clés : Habitat  restoration  Laminar  flow  Porous  media  Stormwater  treatment  Vegetation  flow  Wetland Résumé : Wetland flow is currently actively studied because of its applications in stormwater management, wastewater treatment and habitat restoration. This research applies the well-established poroelastic media flow theory to uniform laminar wetland flow through submerged and floating vegetation, where the linear interaction between the pore water and the vegetation skeleton is considered in the equations of motion. The effects of vegetation porosity on the velocity, the shear stress and the energy distributions in different layers are first derived analytically and interpreted graphically and physically. As special cases, the homogeneous water flow, as also floating, submerged and emergent vegetation flows are then discussed. This research provides qualitative understanding of wetland flow on velocity, shear stress and energy distributions, indicating that a plant applies a significant resistance to the flow system and dissipates most of the flow energy. The results serve a benchmark framework for the future study on turbulent vegetation flow. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.641327