The Experts below are selected from a list of 1014 Experts worldwide ranked by ideXlab platform
Rujikiatkamjorn Cholachat - One of the best experts on this subject based on the ideXlab platform.
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Analytical solutions for a single vertical drain with vacuum and time-dependent surcharge preloading in membrane and membraneless systems
'Sociological Research Online', 2012Co-Authors: Geng Xueyu, Indraratna Buddhima, Rujikiatkamjorn CholachatAbstract:A system of vertical drains with combined vacuum and surcharge preloading is an effective method for promoting radial flow, which accelerates soil consolidation. This study presents the analytical solutions of vertical drains with vacuum preloading for membrane and membraneless systems under time-dependent surcharge preloading. Both vertical and horizontal drainage were considered in this analysis because they reflect realistic in situ conditions. According to the field and laboratory observations, the vacuum in the membraneless system was assumed to be decreasing along the drain; in the membrane system, it was maintained at a constant level. This model was verified by using the measured settlements and excess pore pressures obtained from large-scale laboratory testing and case histories in Australia, Korea, and China. The analytical solutions improved the accuracy of predicting the dissipation of pore water pressure and the associated settlement. The effect of the permeability of the Sand Blanket in a membrane system, and the possible loss of vacuum, were also discusse
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Consolidation of ground with prefabricated vertical drains combined with time-depending surcharge loading in Membrane system
'Sociological Research Online', 2012Co-Authors: Indraratna Buddhima, Geng X Y, Rujikiatkamjorn CholachatAbstract:The system of vertical drains combined with vacuum pressure and/or surcharge preloading is widely used to accelerate the consolidation of soft clay, in order to decrease the long-term settlements and curtail lateral displacement. This study presents a solution of soil consolidation subjected to vacuum preloading for a membrane system, which is comprised of an airtight membrane laid over the drainage layer, under time-dependent surcharge preloading. Both vertical and horizontal drainage were considered in this analysis to reflect realistic in-situ conditions. The model was verified using the measured settlement and excess pore water pressure obtained from various sites at Ballina Bypass, Australia. In the paper, the solutions improve the accuracy of predicting the dissipation of pore water pressure and the associated settlement. The effect of the permeability of the Sand Blanket in the membrane system and the possible loss of vacuum are also discussed. Finally, design charts have been developed, for the convenience of practicing engineers
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Analytical solutions for a single vertical drain with vacuum and time-dependent surcharge preloading in membrane and membraneless systems
'IOP Publishing', 2012Co-Authors: Geng Xueyu, Indraratna Buddhima, Rujikiatkamjorn CholachatAbstract:A system of vertical drains with combined vacuum and surcharge preloading is an effective method for promoting radial flow, which accelerates soil consolidation. This study presents the analytical solutions of vertical drains with vacuum preloading for membrane and membraneless systems under time-dependent surcharge preloading. Both vertical and horizontal drainage were considered in this analysis because they reflect realistic in situ conditions. According to the field and laboratory observations, the vacuum in the membraneless system was assumed to be decreasing along the drain; in the membrane system, it was maintained at a constant level. This model was verified by using the measured settlements and excess pore pressures obtained from large-scale laboratory testing and case histories in Australia, Korea, and China. The analytical solutions improved the accuracy of predicting the dissipation of pore water pressure and the associated settlement. The effect of the permeability of the Sand Blanket in a membrane system, and the possible loss of vacuum, were also discussed. - See more at: http://ascelibrary.org/doi/full/10.1061/%28ASCE%29GM.1943-5622.0000106#sthash.r1zIxJ2b.dpu
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Analytical solutions for a single vertical drain with time-dependent vacuum combined surcharge preloading in membrane and membraneless systems
'Sociological Research Online', 2010Co-Authors: Geng Xueyu, Indraratna Buddhima, Rujikiatkamjorn CholachatAbstract:Vertical drains combined with vacuum pressure and surcharge preloading are widely used to accelerate the consolidation process of soft clay in order to decrease the pore pressure as well as to increase the effective stress. Currently there are two types of vacuum preloading systems commercially available; (a) membrane system with an airtight membrane over the drainage layer and, (b) membraneless system where a vacuum system is connected to individual drain. Their effectiveness varies from site to site depending on the type of soil treated and the characteristics of the drain-vacuum system. This study presents the analytical solutions of vertical drains with vacuum preloading for both membrane and membraneless systems. According to the field and laboratory observations, the vacuum in both of the membraneless and membrane system was assumed to be decreasing along the drain whereas in the membrane system, it was maintained at a constant level. This model was verified by using the measured settlements and excess pore pressures obtained from large-scale laboratory testing and case studies in Australia. The analytical solutions improved the accuracy of predicting the dissipation of pore water pressure and the associated settlement. The effects of the permeability of the Sand Blanket in a membrane system and the possible loss of vacuum were also discussed
Geng Xueyu - One of the best experts on this subject based on the ideXlab platform.
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Analytical solutions for a single vertical drain with vacuum and time-dependent surcharge preloading in membrane and membraneless systems
'Sociological Research Online', 2012Co-Authors: Geng Xueyu, Indraratna Buddhima, Rujikiatkamjorn CholachatAbstract:A system of vertical drains with combined vacuum and surcharge preloading is an effective method for promoting radial flow, which accelerates soil consolidation. This study presents the analytical solutions of vertical drains with vacuum preloading for membrane and membraneless systems under time-dependent surcharge preloading. Both vertical and horizontal drainage were considered in this analysis because they reflect realistic in situ conditions. According to the field and laboratory observations, the vacuum in the membraneless system was assumed to be decreasing along the drain; in the membrane system, it was maintained at a constant level. This model was verified by using the measured settlements and excess pore pressures obtained from large-scale laboratory testing and case histories in Australia, Korea, and China. The analytical solutions improved the accuracy of predicting the dissipation of pore water pressure and the associated settlement. The effect of the permeability of the Sand Blanket in a membrane system, and the possible loss of vacuum, were also discusse
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Analytical solutions for a single vertical drain with vacuum and time-dependent surcharge preloading in membrane and membraneless systems
'IOP Publishing', 2012Co-Authors: Geng Xueyu, Indraratna Buddhima, Rujikiatkamjorn CholachatAbstract:A system of vertical drains with combined vacuum and surcharge preloading is an effective method for promoting radial flow, which accelerates soil consolidation. This study presents the analytical solutions of vertical drains with vacuum preloading for membrane and membraneless systems under time-dependent surcharge preloading. Both vertical and horizontal drainage were considered in this analysis because they reflect realistic in situ conditions. According to the field and laboratory observations, the vacuum in the membraneless system was assumed to be decreasing along the drain; in the membrane system, it was maintained at a constant level. This model was verified by using the measured settlements and excess pore pressures obtained from large-scale laboratory testing and case histories in Australia, Korea, and China. The analytical solutions improved the accuracy of predicting the dissipation of pore water pressure and the associated settlement. The effect of the permeability of the Sand Blanket in a membrane system, and the possible loss of vacuum, were also discussed. - See more at: http://ascelibrary.org/doi/full/10.1061/%28ASCE%29GM.1943-5622.0000106#sthash.r1zIxJ2b.dpu
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Consolidation of ground with prefabricated vertical drains combined with time-dependent surcharge loading in membrane system
'American Society of Civil Engineers (ASCE)', 2012Co-Authors: Indraratna B., Geng Xueyu, Rujikiatkamjorn C.Abstract:The system of vertical drains combined with vacuum pressure and/or surcharge preloading is widely used to accelerate the consolidation of soft clay, in order to decrease the long-term settlements and curtail lateral displacement. This study presents a solution of soil consolidation subjected to vacuum preloading for a membrane system, which is comprised of an airtight membrane laid over the drainage layer, under time-dependent surcharge preloading. Both vertical and horizontal drainage were considered in this analysis to reflect realistic in-situ conditions. The model was verified using the measured settlement and excess pore water pressure obtained from various sites at Ballina Bypass, Australia. In the paper, the solutions improve the accuracy of predicting the dissipation of pore water pressure and the associated settlement. The effect of the permeability of the Sand Blanket in the membrane system and the possible loss of vacuum are also discussed. Finally, design charts have been developed, for the convenience of practicing engineers. - See more at: http://ascelibrary.org/doi/pdf/10.1061/9780784412121.007#sthash.zwdpvL6T.dpu
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Analytical solutions for a single vertical drain with time-dependent vacuum combined surcharge preloading in membrane and membraneless systems
'Sociological Research Online', 2010Co-Authors: Geng Xueyu, Indraratna Buddhima, Rujikiatkamjorn CholachatAbstract:Vertical drains combined with vacuum pressure and surcharge preloading are widely used to accelerate the consolidation process of soft clay in order to decrease the pore pressure as well as to increase the effective stress. Currently there are two types of vacuum preloading systems commercially available; (a) membrane system with an airtight membrane over the drainage layer and, (b) membraneless system where a vacuum system is connected to individual drain. Their effectiveness varies from site to site depending on the type of soil treated and the characteristics of the drain-vacuum system. This study presents the analytical solutions of vertical drains with vacuum preloading for both membrane and membraneless systems. According to the field and laboratory observations, the vacuum in both of the membraneless and membrane system was assumed to be decreasing along the drain whereas in the membrane system, it was maintained at a constant level. This model was verified by using the measured settlements and excess pore pressures obtained from large-scale laboratory testing and case studies in Australia. The analytical solutions improved the accuracy of predicting the dissipation of pore water pressure and the associated settlement. The effects of the permeability of the Sand Blanket in a membrane system and the possible loss of vacuum were also discussed
Indraratna Buddhima - One of the best experts on this subject based on the ideXlab platform.
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Analytical solutions for a single vertical drain with vacuum and time-dependent surcharge preloading in membrane and membraneless systems
'Sociological Research Online', 2012Co-Authors: Geng Xueyu, Indraratna Buddhima, Rujikiatkamjorn CholachatAbstract:A system of vertical drains with combined vacuum and surcharge preloading is an effective method for promoting radial flow, which accelerates soil consolidation. This study presents the analytical solutions of vertical drains with vacuum preloading for membrane and membraneless systems under time-dependent surcharge preloading. Both vertical and horizontal drainage were considered in this analysis because they reflect realistic in situ conditions. According to the field and laboratory observations, the vacuum in the membraneless system was assumed to be decreasing along the drain; in the membrane system, it was maintained at a constant level. This model was verified by using the measured settlements and excess pore pressures obtained from large-scale laboratory testing and case histories in Australia, Korea, and China. The analytical solutions improved the accuracy of predicting the dissipation of pore water pressure and the associated settlement. The effect of the permeability of the Sand Blanket in a membrane system, and the possible loss of vacuum, were also discusse
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Consolidation of ground with prefabricated vertical drains combined with time-depending surcharge loading in Membrane system
'Sociological Research Online', 2012Co-Authors: Indraratna Buddhima, Geng X Y, Rujikiatkamjorn CholachatAbstract:The system of vertical drains combined with vacuum pressure and/or surcharge preloading is widely used to accelerate the consolidation of soft clay, in order to decrease the long-term settlements and curtail lateral displacement. This study presents a solution of soil consolidation subjected to vacuum preloading for a membrane system, which is comprised of an airtight membrane laid over the drainage layer, under time-dependent surcharge preloading. Both vertical and horizontal drainage were considered in this analysis to reflect realistic in-situ conditions. The model was verified using the measured settlement and excess pore water pressure obtained from various sites at Ballina Bypass, Australia. In the paper, the solutions improve the accuracy of predicting the dissipation of pore water pressure and the associated settlement. The effect of the permeability of the Sand Blanket in the membrane system and the possible loss of vacuum are also discussed. Finally, design charts have been developed, for the convenience of practicing engineers
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Analytical solutions for a single vertical drain with vacuum and time-dependent surcharge preloading in membrane and membraneless systems
'IOP Publishing', 2012Co-Authors: Geng Xueyu, Indraratna Buddhima, Rujikiatkamjorn CholachatAbstract:A system of vertical drains with combined vacuum and surcharge preloading is an effective method for promoting radial flow, which accelerates soil consolidation. This study presents the analytical solutions of vertical drains with vacuum preloading for membrane and membraneless systems under time-dependent surcharge preloading. Both vertical and horizontal drainage were considered in this analysis because they reflect realistic in situ conditions. According to the field and laboratory observations, the vacuum in the membraneless system was assumed to be decreasing along the drain; in the membrane system, it was maintained at a constant level. This model was verified by using the measured settlements and excess pore pressures obtained from large-scale laboratory testing and case histories in Australia, Korea, and China. The analytical solutions improved the accuracy of predicting the dissipation of pore water pressure and the associated settlement. The effect of the permeability of the Sand Blanket in a membrane system, and the possible loss of vacuum, were also discussed. - See more at: http://ascelibrary.org/doi/full/10.1061/%28ASCE%29GM.1943-5622.0000106#sthash.r1zIxJ2b.dpu
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Analytical solutions for a single vertical drain with time-dependent vacuum combined surcharge preloading in membrane and membraneless systems
'Sociological Research Online', 2010Co-Authors: Geng Xueyu, Indraratna Buddhima, Rujikiatkamjorn CholachatAbstract:Vertical drains combined with vacuum pressure and surcharge preloading are widely used to accelerate the consolidation process of soft clay in order to decrease the pore pressure as well as to increase the effective stress. Currently there are two types of vacuum preloading systems commercially available; (a) membrane system with an airtight membrane over the drainage layer and, (b) membraneless system where a vacuum system is connected to individual drain. Their effectiveness varies from site to site depending on the type of soil treated and the characteristics of the drain-vacuum system. This study presents the analytical solutions of vertical drains with vacuum preloading for both membrane and membraneless systems. According to the field and laboratory observations, the vacuum in both of the membraneless and membrane system was assumed to be decreasing along the drain whereas in the membrane system, it was maintained at a constant level. This model was verified by using the measured settlements and excess pore pressures obtained from large-scale laboratory testing and case studies in Australia. The analytical solutions improved the accuracy of predicting the dissipation of pore water pressure and the associated settlement. The effects of the permeability of the Sand Blanket in a membrane system and the possible loss of vacuum were also discussed
Hocking R. - One of the best experts on this subject based on the ideXlab platform.
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Heavy mineral Sands in the Eucla Basin, Southern Australia: Deposition and province-scale prospectivity
'GeoScienceWorld', 2011Co-Authors: Hou B., Keeling J., Reid A., Fairclough M., Belousova E., Frakes L., Hocking R.Abstract:The marine Eucla basin in southern Australia is emerging as a major new heavy minerals province in Australia. Beach placers are associated with a series of partially buried Cenozoic coastal barrier Sands formed along an arcuate 2,000-km-long basin margin, the trace of which is up to 320 km inland of the present coastline. The presence of high-grade deposits with dominant zircon over ilmenite and lesser amounts of rutile and leucoxene was established with the discovery of the Jacinth and Ambrosia heavy mineral deposits in late 2004. An additional 10 heavy mineral prospects were subsequently identified and are at various stages of evaluation. The Eucla basin and its adjacent paleovalley system have a large areal extent that contains a complicated succession of marine and nonmarine strata spanning a wide range of depositional environments. Four distinct constructional phases for the development of shorelines can be recognized and correlated with major third-order sea-level events, established by others from the marine depositional record as occurring during the middle Eocene (~42.5 Ma), late middle Eocene (39–36 Ma), late Eocene (36–34 Ma), and Miocene-Pliocene (15–2.6 Ma). Prevailing westerly winds built extensive dune systems by longshore drift. Sediment movement was from west to east. Detrital zircon grains from the Ooldea and Barton barriers show a distribution of zircon age that is consistent with the Proterozoic Musgrave province to the north of the basin as the dominant primary source area of the heavy minerals, with a contribution from the Albany Fraser orogen to the west. The likelihood is that these heavy minerals have been recycled via sedimentary basins that flank the Musgrave province and include the Neoproterozoic to Cambrian Officer basin and Permian to Mesozoic deposits of the Bight basin. Our current depositional model is summarized as follows: (1) initial rapid transgression and deposition of a shallow marine Sand sheet subsequently overlain by shallow marine limestone during middle Eocene; (2) a major Eocene transgression and deposition of a shelf, barrier, and lagoonal shoreface marine complex during the late middle Eocene; ( 3) further transgression and highstand deposition during the late Eocene; (4) renewed transgression of barrier, lagoonal, and possibly flooding deltaic Sand Blanket in the southeastern coastal plain with neotectonic uplift tilting in the western Eucla margin during Mio-Pliocene time. Each stage of reworking increased the potential for heavy mineral concentration in placer deposits.Baohong Hou, John Keeling, Anthony Reid, Martin Fairclough, Ian Warland, Elena Belousova, Larry Frakes and Roger Hockin
Hocking Roger - One of the best experts on this subject based on the ideXlab platform.
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Heavy mineral Sands in the eucla basin, Southern Australia : deposition and province-scale prospectivity
'GeoScienceWorld', 2011Co-Authors: Hou Baohong, Keeling John, Reid Anthony, Fairclough Martin, Warland Ian, Belousova Elena, Frakes Larry, Hocking RogerAbstract:The marine Eucla basin in southern Australia is emerging as a major new heavy minerals province in Australia. Beach placers are associated with a series of partially buried Cenozoic coastal barrier Sands formed along an arcuate 2,000-km-long basin margin, the trace of which is up to 320 km inland of the present coastline. The presence of high-grade deposits with dominant zircon over ilmenite and lesser amounts of rutile and leucoxene was established with the discovery of the Jacinth and Ambrosia heavy mineral deposits in late 2004. An additional 10 heavy mineral prospects were subsequently identified and are at various stages of evaluation. The Eucla basin and its adjacent paleovalley system have a large areal extent that contains a complicated succession of marine and non marine strata spanning a wide range of depositional environments. Four distinct constructional phases for the development of shorelines can be recognized and correlated with major third-order sea-level events, established by others from the marine depositional record as occurring during the middle Eocene (∼42.5 Ma), late middle Eocene (39-36 Ma), late Eocene (36-34 Ma), and Miocene-Pliocene (15-2.6 Ma). Prevailing westerly winds built extensive dune systems by longshore drift. Sediment movement was from west to east. Detrital zircon rocks from the Ooldea and Barton barriers show a distribution of zircon age that is consistent with the Proterozoic Musgrave province to the north of the basin as the dominant primary source area of the heavy minerals, with a contribution from the Albany Fraser orogen to the west. The likelihood is that these heavy minerals have been recycled via sedimentary basins that flank the Musgrave province and include the Neoproterozoic to Cambrian Officer basin and Permian to Mesozoic deposits of the Bight basin. Our current depositional model is summarized as follows: (1) initial rapid transgression and deposition of a shallow marine Sand sheet subsequently overlain by shallow marine limestone during middle Eocene; (2) a major Eocene transgression and deposition of a shelf barrier and lagoonal shoreface marine complex during the late middle Eocene; ( 3) further transgression and highstand deposition during the late Eocene; (4) renewed transgression of barrier lagoonal and possibly flooding deltaic Sand Blanket in the southeastern coastal plain with neotectonic uplift tilting in the western Eucla margin during Mio-Pliocene time. Each stage of reworking increased the potential for heavy mineral concentration in placer deposits.26 page(s
