Embankment Supported by Low Area Replacement Ratio Stone Columns, Monitoring and Numerical Studies

The focus of this study was to evaluate the behaviour of a test embankment supported on vibro stone columns (VSCs) installed with a low area replacement ratio (7.56%) based on data obtained from field instrumentation complemented by analytical and numerical methods. The test embankment is 5.35 m hig...

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Bibliographic Details
Published inKSCE journal of civil engineering Vol. 26; no. 2; pp. 619 - 629
Main Authors Riccio F., Mario V., Almeida, Marcio S. S., Vasconcelos, Silvana M., Pires, Liliana G. S., Nicodemos R., Luiz F.
Format Journal Article
LanguageEnglish
Published Seoul Korean Society of Civil Engineers 01.02.2022
Springer Nature B.V
Subjects
Civil Engineering
Embankments
Engineering
Finite element method
Geotechnical Engineering
Geotechnical Engineering & Applied Earth Sciences
Industrial Pollution Prevention
Instrumentation
Instruments
Mathematical analysis
Mathematical models
Numerical analysis
Numerical methods
Permeability
Permeability coefficient
Soil permeability
Soil treatment
Stone columns
Time measurement
Two dimensional analysis
Unit cell
Void ratio
Embankments
Ground improvement
Analytical methods
Numerical analysis
Field instrumentation
Soft clays
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Summary:The focus of this study was to evaluate the behaviour of a test embankment supported on vibro stone columns (VSCs) installed with a low area replacement ratio (7.56%) based on data obtained from field instrumentation complemented by analytical and numerical methods. The test embankment is 5.35 m high and was built on top of a soft soil treated with VSCs arranged in a 10-column × 10-column square grid. Analytical and two-dimensional finite element methods using the axisymmetric unit cell approach were also employed in the study to analyse the instrumentation data. The measured settlement-time curves, for the embankment axis, were compatible with finite element analysis in which the coefficient of permeability was continuously updated with the void ratio. Comparison was also favourable regarding measured and predicted values of settlements and improvement factors. All evidence indicates that VSCs installed with a low area replacement ratio (<10%) were quite effective in reducing the time for settlement stabilization and in providing adequate short-term stability against failure, but less effective in reducing the long-term settlement magnitude.
ISSN:1226-7988
1976-3808
DOI:10.1007/s12205-021-0540-9