Embankments on Soft Soil Reinforced with Stone Columns: Numerical Analysis and Proposal of a New Design Method |
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| Authors: | José Leitão Borges Tiago Sabino Domingues António Silva Cardoso |
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| Institution: | (1) Department of Civil Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;(2) Department of Civil Engineering, High Institute of Engineering of Porto, Porto, Portugal |
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| Abstract: | A parametric study of an embankment on soft soils reinforced with stone columns is performed using a computer program based
on the finite element method. The cylindrical unit cell formulation is used by modeling one column and its surrounding soft
soil with confined axisymmetric behaviour. The computer program incorporates the Biot consolidation theory (coupled formulation
of the flow and equilibrium equations) with constitutive relations simulated by the p–q–θ critical state model. The following parameters are analysed: the replacement area ratio, the deformability of the column
material, the thickness of the soft soil, the deformability of the fill and the friction angle of the column material. Based
on the results of this study, a new design method is proposed, relating the settlement improvement factor to the two factors
that revealed major influence: the replacement area ratio and the ratio between the deformability of the soft soil and the
deformability of the column material. |
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