Stone column effectiveness in soils with creep: a numerical study
| Autor: | Brian G. Sexton, Bryan A. McCabe |
|---|---|
| Přispěvatelé: | ~ |
| Rok vydání: | 2016 |
| Předmět: |
Finite element method
021110 strategic defence & security studies Engineering business.industry 0211 other engineering and technologies Stone columns Axisymmetry 02 engineering and technology Creep Settlement improvement factor Geotechnical Engineering and Engineering Geology Column (database) Research council Geotechnical engineering Civil engineering business 021101 geological & geomatics engineering |
| Zdroj: | Geomechanics and Geoengineering. 11:252-269 |
| ISSN: | 1748-6033 1748-6025 |
| DOI: | 10.1080/17486025.2016.1151556 |
| Popis: | While it is well established that vibro stone columns reduce primary settlement and improve bearing capacity, their effect on creep compression has largely been overlooked to date. However, with increasing pressure to develop marginal sites underlain by soft organic soils, the effect of ground treatment on creep is an important emerging issue in geotechnical engineering. In this paper, a series of axisymmetric unit cell analyses have been carried out using the PLAXIS 2D finite element program in conjunction with the Soft Soil Creep (SSC) model. Examination of the evolution of settlement improvement factor with time has indicated that the presence of creep leads to a lower ‘total’ improvement factor than would be obtained for primary consolidation settlement alone. Separate ‘primary’ and ‘creep’ improvement factors have also been derived; the latter are much lower than the former, but are nevertheless greater than unity. Creep results in a stress transfer process; as the soil creeps, vertical stress is transferred from the soil to the stone column. The additional load carried by the column induces additional yielding and shear-plane formation in closely-spaced columns. The additional increment of stress transferred to the already yielded column reduces its efficacy. The authors would like to acknowledge the Irish Research Council (IRC) for funding this research. peer-reviewed 2017-03-16 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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