Failure Mode of Single Stone Column under Full State Response
Publication: Geo-Extreme 2021
ABSTRACT
The stone column is one of the effective ground improvements that is increasingly used to support different infrastructures and buildings built on soft clay soil. Many studies have proven that a single column incorporates three different failure modes: bulging, punching, and shear. The load-carrying capacity and settlement are linked to the column’s behavior and deformation. These parameters are affected by the column configuration and properties, type and condition of loading, and the passive resistance of tributary soil. Studies that analyzed this technique under the serviceability limit state assumed that the effective length to diameter ratio of the column ranged between 4 and 6, and identified bulging as the common mode of deformation. Most studies conducted small scale laboratory works. Therefore, the results may not represent reality or may be appropriate only for shallow foundations supporting a light load. Thus, this project conducted an FE series of analyses to study a stone column’s behavior under a full state response considering the additional factors related to the geometry and properties of the column. Three distinct types of backfill material have been investigated in supporting Bangkok soft clay soil. The results of the investigation showed various failure modes, and the sand column was not appropriate to improve Bangkok soft clay. Also, it was observed that the effective L/H ratio used to improve the Bangkok soft clay is 0.5 with a column length equal to 6 m when made from aggregate material.
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Geo-Extreme 2021
Pages: 66 - 78
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© 2021 American Society of Civil Engineers.
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Published online: Nov 4, 2021
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