Stress-strain State of Thick-walled Soil Cylinder with Sand Core and Grillage View of Elastoplastic Properties of the Soil

The article describes the formulation and solution of the axisymmetric problem of quantify SSS composite cylinder with a sandy soil under the influence of an external load of plate foundations, analytical and numerical methods based on elastic-plastic properties of soils. Shown that the axial force on the composite cylinder is distributed between the sand-pile and the surrounding previously compacted weak soil in proportion to their stiffness and diameter ratio. It is noted that at a certain load in the sand pile, plastic deformations occur as a result of which the stresses are redistributed, and the total deformation of the composite cylinder develops nonlinearly. It is shown that, depending on the calculation model adopted in the sandy soil pile at stresses close to the ultimate value various forms of destruction forming, including the barrel at different levels. Stresses that this phenomenon was observed for the first time and requires further research and theoretical basis.