Foundations of embankments with encased Stone columns.

Miranda Manzanares, Marina; Castro, Jorge; Sagaseta, Cesar; Ca�izal, Jorge; Da Costa, Almudena

Abstract

Stone columns are a common improvement technique for foundations of embankments in soft soils. When the soft soil
does not provide enough lateral support, the columns are encased with a geosynthetic. This paper presents a closed-form solution to
study soft soil improvement, both reduction of settlement and consolidation time, by means of encased stone columns. An end-bearing
column and its surrounding soil, is modelled in axial symmetry under a rigid and constant load. Soil is assumed as elastic but plastic
strains are considered in the column. An elasto-plastic behaviour is also considered for the encasement by means of a limit tensile
strength. Parametric studies of the settlement reduction and stress concentration show the efficiency of encasing the columns, which is
mainly ruled by the encasement stiffness compared to that of the soil. The analytical results are in good agreement with numerical
analyses. Finally, the encasement length is analysed using the closed-form solution.

Citation

Miranda Manzanares, M., Castro, J., Sagaseta, C., Cañizal, J., & Da Costa, A. (2013, September). Foundations of embankments with encased Stone columns. Presented at 18th International conference on Soil mechanics and Geotechnical Engineering, Paris

• Presentation Conference Type: Conference Paper (published)
• Conference Name: 18th International conference on Soil mechanics and Geotechnical Engineering
• Start Date: Sep 2, 2013
• End Date: Sep 6, 2013
• Acceptance Date: Sep 2, 2013
• Publication Date: Sep 2, 2013
• Deposit Date: Dec 1, 2016
• Publicly Available Date: Dec 2, 2016
• Book Title: Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013
• Keywords: soft soils, ground improvement, encased stone columns, analytical solution, numerical analyses.
• Public URL: http://researchrepository.napier.ac.uk/Output/444889
• Related Public URLs: http://www.issmge.org/publications/online-library
• Contract Date: Dec 1, 2016