Bearing capacity optimization of T-shaped soil-cement column-improved soft ground under soft fill

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, failur...

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Main Authors: Ni, Pengpeng, Yi, Yaolin, Liu, Songyu
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/159674
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1596742022-06-29T02:32:14Z Bearing capacity optimization of T-shaped soil-cement column-improved soft ground under soft fill Ni, Pengpeng Yi, Yaolin Liu, Songyu School of Civil and Environmental Engineering Engineering::Civil engineering Composite Ground T-Shaped Column 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. Nanyang Technological University Published version The supports from the National Natural Science Foundation of China (52078506) and the start-up grant (M4081914.030) provided by Nanyang Technological University, Singapore, are highly appreciated. 2022-06-29T02:32:14Z 2022-06-29T02:32:14Z 2021 Journal Article Ni, P., Yi, Y. & Liu, S. (2021). Bearing capacity optimization of T-shaped soil-cement column-improved soft ground under soft fill. Soils and Foundations, 61(2), 416-428. https://dx.doi.org/10.1016/j.sandf.2021.01.001 0038-0806 https://hdl.handle.net/10356/159674 10.1016/j.sandf.2021.01.001 2-s2.0-85099742113 2 61 416 428 en M4081914.030 Soils and Foundations © 2021. Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Civil engineering
Composite Ground
T-Shaped Column
spellingShingle Engineering::Civil engineering
Composite Ground
T-Shaped Column
Ni, Pengpeng
Yi, Yaolin
Liu, Songyu
Bearing capacity optimization of T-shaped soil-cement column-improved soft ground under soft fill
description 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.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Ni, Pengpeng
Yi, Yaolin
Liu, Songyu
format Article
author Ni, Pengpeng
Yi, Yaolin
Liu, Songyu
author_sort Ni, Pengpeng
title Bearing capacity optimization of T-shaped soil-cement column-improved soft ground under soft fill
title_short Bearing capacity optimization of T-shaped soil-cement column-improved soft ground under soft fill
title_full Bearing capacity optimization of T-shaped soil-cement column-improved soft ground under soft fill
title_fullStr Bearing capacity optimization of T-shaped soil-cement column-improved soft ground under soft fill
title_full_unstemmed Bearing capacity optimization of T-shaped soil-cement column-improved soft ground under soft fill
title_sort bearing capacity optimization of t-shaped soil-cement column-improved soft ground under soft fill
publishDate 2022
url https://hdl.handle.net/10356/159674
_version_ 1738844882334646272