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NUMERICAL ANALYSIS OF STONE COLUMNS CREATED USING DIFFERENT TYPES OF COARSE - GRAINED MATERIAL
Abstract
The determination of a stone column resistance and deformation is often based on empirical correlations, in пїЅ situ tests and previous experiences in similar geological conditions. In last decade, the stone columns are also designed using a numerical modelling пїЅ usually by finite element method (FEM). The most important parameters of a stone column are the unit weight which corresponding to the relative density, effective angle of shears strength and deformation modulus. Last but not least properties of the original subsoil are also very important for determination of ultimate resistance and deformation of the stone column. The article deals with a numerical simulation of the stone column taking into account the installation process. The study presented is focused especially on impact of the unit weight, shear strength and deformation modulus of the stone columns made of different types of coarse пїЅ grained materials to their resistance as well as their deformation. The analysis was made in form of a parametric study where all these important properties of coarse пїЅ grained material were analysed. The range of the unit weight for the study was given by minimal and maximal unit weight, determined in laboratory, for each type of coarse пїЅ grained material. The results of analysis show, that the most important parameters for stone column design are parameters of the shear strength. An independent change of the value of the unit weight as well as oedometric modulus cause only small change of the stone column resistance.
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