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Title: Bearing capacity optimization of T-shaped soil-cement column-improved soft ground under soft fill
Authors: Ni, Pengpeng
Yi, Yaolin
Liu, Songyu
Keywords: Engineering::Civil engineering
Issue Date: 2021
Source: 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.
Project: M4081914.030
Journal: Soils and Foundations
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.
ISSN: 0038-0806
DOI: 10.1016/j.sandf.2021.01.001
Schools: School of Civil and Environmental Engineering 
Rights: © 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 (
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles

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