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Undrained Stability Analysis of Embankment on Ordinary and Encased-Granular Columns in Soft Clay
In this study, undrained behavior of a road embankment overlying ordinary and geosynthetic-encased granular columns is evaluated through fully coupled nonlinear stress analysis. In this contribution, the equivalent area methodology is used to convert the strengthened zone into an equivalent area including soft soil and granular columns. Diameter and internal friction angle of granular columns, undrained shear strength of soft soil, encasement stiffness, and encasement length are all varied aiming to compare the performance of embankment in undrained condition. Results show that enlarging columns size from 0.6 to 1.2 m reduces total deformations to half. However, this improvement can be 30% enhanced as granular columns are fully encased. Also, the computed failure mode alters from deep-seated to surficial failure surface as column size, internal friction angle of column filling material, and encasement stiffness increase. Unlike encased columns, embankment on ordinary granular columns in soft soil with threshold cu value of 11.5 kPa fails due to lack of sufficient lateral support from very soft soil. In addition, encasement stiffness is found to be the most critical factor affecting deformations and stability of embankment, among others.
Undrained Stability Analysis of Embankment on Ordinary and Encased-Granular Columns in Soft Clay
In this study, undrained behavior of a road embankment overlying ordinary and geosynthetic-encased granular columns is evaluated through fully coupled nonlinear stress analysis. In this contribution, the equivalent area methodology is used to convert the strengthened zone into an equivalent area including soft soil and granular columns. Diameter and internal friction angle of granular columns, undrained shear strength of soft soil, encasement stiffness, and encasement length are all varied aiming to compare the performance of embankment in undrained condition. Results show that enlarging columns size from 0.6 to 1.2 m reduces total deformations to half. However, this improvement can be 30% enhanced as granular columns are fully encased. Also, the computed failure mode alters from deep-seated to surficial failure surface as column size, internal friction angle of column filling material, and encasement stiffness increase. Unlike encased columns, embankment on ordinary granular columns in soft soil with threshold cu value of 11.5 kPa fails due to lack of sufficient lateral support from very soft soil. In addition, encasement stiffness is found to be the most critical factor affecting deformations and stability of embankment, among others.
Undrained Stability Analysis of Embankment on Ordinary and Encased-Granular Columns in Soft Clay
Transp. Infrastruct. Geotech.
Hosseinpour, Iman (author) / Rezvani, Reza (author) / Ebrahimzade, Saeed (author)
Transportation Infrastructure Geotechnology ; 11 ; 2791-2813
2024-08-01
23 pages
Article (Journal)
Electronic Resource
English
Undrained Stability Analysis of Embankment on Ordinary and Encased-Granular Columns in Soft Clay
| Springer Verlag | 2024
Experimental Analysis of Embankment on Ordinary and Encased Stone Columns
| Online Contents | 2016