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Anand J. Puppala - One of the best experts on this subject based on the ideXlab platform.
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Bearing capacity of composite foundation consisting of T-shaped soil-Cement Column and soft clay
Transportation Geotechnics, 2018Co-Authors: Songyu Liu, Anand J. PuppalaAbstract:Abstract The T-shaped Column is a soil-Cement Column with two diameters, which is installed by foldable deep mixing blades for soft clay treatment. As a variable-diameter Column, its design method is not well established, and this study focuses on the bearing capacity of composite foundation consisting of T-shaped Columns and soft clay. A laboratory model test was employed to study the bearing capacity, stress distribution, and failure mode of the composite foundation. Twelve full-scale loading tests were performed in the field to study the geometrical parameters of composite foundation affecting on its bearing capacity. The experimental results indicated that the bearing capacity of composite foundation increased with increasing of the cap length and Column diameter, and decreasing of the Column spacing. The experimental results also revealed that the Column failure might occur at the small-diameter Column just below the Column cap, which then led to the soil failure nearby. By including this additional failure mode, the design method for conventional Column was adapted to estimate the bearing capacity of composite foundation consisting of T-shaped Column and soft clay, and the method was validated by the experimental data.
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vertical bearing capacity behaviour of single t shaped soil Cement Column in soft ground laboratory modelling field test and calculation
Acta Geotechnica, 2017Co-Authors: Yaolin Yi, Anand J. Puppala, Peisheng XiAbstract:The T-shaped soil–Cement Column is a variable-diameter Column, which has an enlarged Column cap at the shallow depth, resulting in the Column shape being analogous to the letter “T”. In this study, 1-g laboratory and full-scale field loading tests were employed to investigate the vertical bearing capacity behaviour of a single T-shaped Column in soft ground. Pressure cells were set in a T-shaped Column in the field to measure the vertical Column stress above and below the Column cap during the loading test. After the loading test, several Columns were excavated to investigate their failure modes. The results indicated that, since the section area of the Column cap was remarkably higher than that of the deep-depth Column, the stress concentration occurred in the deep-depth Column just under the cap, leading to Column failure. Based on this failure mode, a simplified method was proposed to estimate the ultimate bearing capacity of a single T-shaped Column; the comparison of estimated and measured results indicated the applicability of the proposed method.
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Vertical bearing capacity behaviour of single T-shaped soil–Cement Column in soft ground: laboratory modelling, field test, and calculation
Acta Geotechnica, 2017Co-Authors: Songyu Liu, Anand J. PuppalaAbstract:The T-shaped soil–Cement Column is a variable-diameter Column, which has an enlarged Column cap at the shallow depth, resulting in the Column shape being analogous to the letter “T”. In this study, 1-g laboratory and full-scale field loading tests were employed to investigate the vertical bearing capacity behaviour of a single T-shaped Column in soft ground. Pressure cells were set in a T-shaped Column in the field to measure the vertical Column stress above and below the Column cap during the loading test. After the loading test, several Columns were excavated to investigate their failure modes. The results indicated that, since the section area of the Column cap was remarkably higher than that of the deep-depth Column, the stress concentration occurred in the deep-depth Column just under the cap, leading to Column failure. Based on this failure mode, a simplified method was proposed to estimate the ultimate bearing capacity of a single T-shaped Column; the comparison of estimated and measured results indicated the applicability of the proposed method.
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laboratory modelling of t shaped soil Cement Column for soft ground treatment under embankment
Geotechnique, 2016Co-Authors: Songyu Liu, Anand J. PuppalaAbstract:This technical note presents a laboratory modelling of a T-shaped soil–Cement Column for soft ground treatment under an embankment, and compares it with a conventional Column. A thick sand layer was placed between the Column-treated ground and the loading plate to simulate the embankment effect, and the stress, excess pore pressure and settlement of the ground were analysed. Since the T-shaped Column had an enlarged Column cap, it took more applied load than the conventional Column, resulting in less stress on the soil. This effect reduced the soil settlement and differential settlement of the ground, and increased its consolidation rate.
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Laboratory modelling of T-shaped soil–Cement Column for soft ground treatment under embankment
Géotechnique, 2016Co-Authors: Songyu Liu, Anand J. PuppalaAbstract:This technical note presents a laboratory modelling of a T-shaped soil–Cement Column for soft ground treatment under an embankment, and compares it with a conventional Column. A thick sand layer was placed between the Column-treated ground and the loading plate to simulate the embankment effect, and the stress, excess pore pressure and settlement of the ground were analysed. Since the T-shaped Column had an enlarged Column cap, it took more applied load than the conventional Column, resulting in less stress on the soil. This effect reduced the soil settlement and differential settlement of the ground, and increased its consolidation rate.
Songyu Liu - One of the best experts on this subject based on the ideXlab platform.
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Bearing capacity optimization of T-shaped soil-Cement Column-improved soft ground under soft fill
Soils and Foundations, 2021Co-Authors: Songyu LiuAbstract:Abstract During dredging activities, a large amount of dredged clay slurry or lump is produced. A dumping site composed of soft clay near the water body is often used to deposit dredged soft fill. Soil-Cement Columns are commonly employed to treat the soft ground for this application. Under soft fill, failure of soft clay dominates the behaviour of composite ground. Hence, a soil-Cement slab is needed to form a load transfer platform above the Columns, which is costly. As an alternative, the use of T-shaped Column with an enlarged Column cap is proposed. In this study, the responses of composite ground with T-shaped Column are measured experimentally, which are used to calibrate a numerical model. The results of numerical parametric analyses show that the implementation of T-shaped Column under soft fill can change the governing failure mode into Column failure, once the diameter of Column cap exceeds a certain value, after which the improvement efficiency is the same between T-shaped Column and Column-slab system. The height of Column cap results in negligible difference in bearing capacity, and a minimum value of 0.3 m is suggested for use in design to avoid punching failure.
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Numerical Investigation of T-Shaped Soil-Cement Column Supported Embankment Over Soft Ground
Springer Series in Geomechanics and Geoengineering, 2018Co-Authors: Songyu LiuAbstract:Deep mixing is a technique to stabilize soft soils in situ by mixing with Cementitious binders to form Columns. An innovative soil-Cement Column is proposed, with an enlarged Column cap at shallow depth, and as such the Column shape is analogous to a letter “T”. This paper presents a numerical investigation on the performance of T-shaped soil-Cement Column supported embankment over soft ground. The sensitivity of differential settlement between soil and Column, as well as soil and Column stresses in the middle of the embankment to the diameter and the height of the enlarged Column cap is systemically studied.
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Bearing capacity of composite foundation consisting of T-shaped soil-Cement Column and soft clay
Transportation Geotechnics, 2018Co-Authors: Songyu Liu, Anand J. PuppalaAbstract:Abstract The T-shaped Column is a soil-Cement Column with two diameters, which is installed by foldable deep mixing blades for soft clay treatment. As a variable-diameter Column, its design method is not well established, and this study focuses on the bearing capacity of composite foundation consisting of T-shaped Columns and soft clay. A laboratory model test was employed to study the bearing capacity, stress distribution, and failure mode of the composite foundation. Twelve full-scale loading tests were performed in the field to study the geometrical parameters of composite foundation affecting on its bearing capacity. The experimental results indicated that the bearing capacity of composite foundation increased with increasing of the cap length and Column diameter, and decreasing of the Column spacing. The experimental results also revealed that the Column failure might occur at the small-diameter Column just below the Column cap, which then led to the soil failure nearby. By including this additional failure mode, the design method for conventional Column was adapted to estimate the bearing capacity of composite foundation consisting of T-shaped Column and soft clay, and the method was validated by the experimental data.
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Vertical bearing capacity behaviour of single T-shaped soil–Cement Column in soft ground: laboratory modelling, field test, and calculation
Acta Geotechnica, 2017Co-Authors: Songyu Liu, Anand J. PuppalaAbstract:The T-shaped soil–Cement Column is a variable-diameter Column, which has an enlarged Column cap at the shallow depth, resulting in the Column shape being analogous to the letter “T”. In this study, 1-g laboratory and full-scale field loading tests were employed to investigate the vertical bearing capacity behaviour of a single T-shaped Column in soft ground. Pressure cells were set in a T-shaped Column in the field to measure the vertical Column stress above and below the Column cap during the loading test. After the loading test, several Columns were excavated to investigate their failure modes. The results indicated that, since the section area of the Column cap was remarkably higher than that of the deep-depth Column, the stress concentration occurred in the deep-depth Column just under the cap, leading to Column failure. Based on this failure mode, a simplified method was proposed to estimate the ultimate bearing capacity of a single T-shaped Column; the comparison of estimated and measured results indicated the applicability of the proposed method.
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laboratory modelling of t shaped soil Cement Column for soft ground treatment under embankment
Geotechnique, 2016Co-Authors: Songyu Liu, Anand J. PuppalaAbstract:This technical note presents a laboratory modelling of a T-shaped soil–Cement Column for soft ground treatment under an embankment, and compares it with a conventional Column. A thick sand layer was placed between the Column-treated ground and the loading plate to simulate the embankment effect, and the stress, excess pore pressure and settlement of the ground were analysed. Since the T-shaped Column had an enlarged Column cap, it took more applied load than the conventional Column, resulting in less stress on the soil. This effect reduced the soil settlement and differential settlement of the ground, and increased its consolidation rate.
Allan E Inglis - One of the best experts on this subject based on the ideXlab platform.
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ipsilateral total shoulder arthroplasty and total elbow replaCement arthroplasty
Journal of Arthroplasty, 2000Co-Authors: Allan E InglisAbstract:Abstract Shoulder and elbow replaCement arthroplasty both achieve a high degree of success in patients with inflammatory arthritis. When both arthroplasties are performed on the same side, a stress riser can occur in the humeral diaphysis between the tips of the 2 humeral components. When the shoulder arthroplasty is performed first, a short-stemmed humeral component is advised. If a long-stemmed humeral component at either joint is already in place, the Cement Column for the subsequent arthroplasty should extend to and include the Cement Column for the extant component.
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case reportipsilateral total shoulder arthroplasty and total elbow replaCement arthroplasty a caveat
Journal of Arthroplasty, 2000Co-Authors: Allan E InglisAbstract:Shoulder and elbow replaCement arthroplasty both achieve a high degree of success in patients with inflammatory arthritis. When both arthroplasties are performed on the same side, a stress riser can occur in the humeral diaphysis between the tips of the 2 humeral components. When the shoulder arthroplasty is performed first, a short-stemmed humeral component is advised. If a long-stemmed humeral component at either joint is already in place, the Cement Column for the subsequent arthroplasty should extend to and include the Cement Column for the extant component.
Nazri Ali - One of the best experts on this subject based on the ideXlab platform.
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Experimental investigations on ultimate bearing capacity of peat stabilized by a group of soil–Cement Column: a comparative study
Acta Geotechnica, 2016Co-Authors: Ali Dehghanbanadaki, Kamarudin Ahmad, Nazri AliAbstract:The aim of this paper was to determine the ultimate vertical bearing capacity of rectangular rigid footings resting on homogeneous peat stabilized by a group of Cement deep mixing (CDM) Columns. For this purpose, a series of physical modeling tests involving end-bearing and floating CDM Columns were performed. Three length/depth ratios of 0.25, 0.5, and 0.75 and three area improvement ratios of 13.1, 19.6, and 26.2 % were considered. Bearing capacity of the footings was studied using different analytical procedures. The results indicated that compared to unimproved peat, the average ultimate bearing capacity (UBC) improvement of floating and end-bearing CDM Columns were 60 and 223 %, respectively. The current study found that simple Brom’s method predicted the UBC of the peat stabilized with floating CDM Columns with reasonable accuracy, but underestimated the UBC by up to 25 % in the case of end-bearing CDM Columns. Published laboratory experiences of stabilizing soft soils using soil–Cement Columns were also collated in this paper.
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experimental investigations on ultimate bearing capacity of peat stabilized by a group of soil Cement Column a comparative study
Acta Geotechnica, 2016Co-Authors: Ali Dehghanbanadaki, Kamarudin Ahmad, Nazri AliAbstract:The aim of this paper was to determine the ultimate vertical bearing capacity of rectangular rigid footings resting on homogeneous peat stabilized by a group of Cement deep mixing (CDM) Columns. For this purpose, a series of physical modeling tests involving end-bearing and floating CDM Columns were performed. Three length/depth ratios of 0.25, 0.5, and 0.75 and three area improvement ratios of 13.1, 19.6, and 26.2 % were considered. Bearing capacity of the footings was studied using different analytical procedures. The results indicated that compared to unimproved peat, the average ultimate bearing capacity (UBC) improvement of floating and end-bearing CDM Columns were 60 and 223 %, respectively. The current study found that simple Brom’s method predicted the UBC of the peat stabilized with floating CDM Columns with reasonable accuracy, but underestimated the UBC by up to 25 % in the case of end-bearing CDM Columns. Published laboratory experiences of stabilizing soft soils using soil–Cement Columns were also collated in this paper.
Peisheng Xi - One of the best experts on this subject based on the ideXlab platform.
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vertical bearing capacity behaviour of single t shaped soil Cement Column in soft ground laboratory modelling field test and calculation
Acta Geotechnica, 2017Co-Authors: Yaolin Yi, Anand J. Puppala, Peisheng XiAbstract:The T-shaped soil–Cement Column is a variable-diameter Column, which has an enlarged Column cap at the shallow depth, resulting in the Column shape being analogous to the letter “T”. In this study, 1-g laboratory and full-scale field loading tests were employed to investigate the vertical bearing capacity behaviour of a single T-shaped Column in soft ground. Pressure cells were set in a T-shaped Column in the field to measure the vertical Column stress above and below the Column cap during the loading test. After the loading test, several Columns were excavated to investigate their failure modes. The results indicated that, since the section area of the Column cap was remarkably higher than that of the deep-depth Column, the stress concentration occurred in the deep-depth Column just under the cap, leading to Column failure. Based on this failure mode, a simplified method was proposed to estimate the ultimate bearing capacity of a single T-shaped Column; the comparison of estimated and measured results indicated the applicability of the proposed method.