- مبلغ: ۸۶,۰۰۰ تومان
- مبلغ: ۹۱,۰۰۰ تومان
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.