Distribution of stresses on the base of strip foundations with consideration influence of the porosity coefficient

Abstract

The article draws attention to the fact that the nature of the stress distribution is important in determining the deformations foundations based, the calculation of which is central for the strip foundations. Described that the stresses in soils directly under the load considerably exceed the theoretical, determined by the formulas of elasticity theory. Formulas are given that make it possible to determine the constituent stresses from the band loading, evenly distributed along strip foundations based, according to the linearly deformed media theory. It is insufficient to use elasticity theory equations to determine the true values of deformations. The necessity of taking into account the additional conditions arising from the physical nature of soils, as a dispersed environment, that is, a change in the porosity coefficient when the pressure under the compression law is changed. Shows solving of stress distribution problem in ground base from the load applied on the surface, taking into account the coefficient of soil porosity. Formulas are given that make it possible to determine the components of stresses from the band loading, evenly distributed along strip foundations based, taking into account the soils state. The influence of the porosity coefficient on the nature of the stresses distribution on the base of tape foundations is investigated, data are obtained for the possibility of analytical calculations. The coefficients of dependence of vertical stresses on the applied load for soils with different porosity coefficient are determined. A comparative estimation of the obtained results with the resulted theoretical decisions is carried out. For a visual assessment of porosity coefficient effect on the nature of stresses distribution in the base, graphic dependence of the coefficient of stress variation α from the relative depth ς.