Sheikhnazari H. Post footing of the shallow foundation in the soil condi-tions of Iran

The object of study - is the interaction of post footing with sand-clay base taking into account the voids content and variable modulus of deformation. Purpose of the study - is the stress- strain state of post footings base. Purpose - to develop a method for calculating the precipitation base columnar foundations within the linear and nonlinear deformation taking into account the variable deformation modulus, porosity, soil and comparing the results with experimental data. Methods: are experimental that are static tests of post footing in sandy and clay soils in Iran; theoretical, meant to identify the effect of the void ratio of soils on the nature of the stress distribution at the base of the post footing, to develop an appropriate methodology of foundation settlement calculating including linear and non-linear deformation. Novelty - is that for the first time with the help of the method of numerical integration the problem of stress distribution at the base of post footing with the void ratio of soils was solved; the effect of the void ratio of soils on the nature of the stress distribution in homogeneous and heterogeneous on the base of post footing was revealed; the method of determination of the variable modulus of deformation at the level of the footing and in depth was developed; it was developed the new method of practical calculation of post footing foundation settlement in the area of linear and non-linear deformation with the void ratio of soils and their variable modulus of the deformation, which allows us to construct a graph of S = f (P); the mathematical model of calculating of the stress-deformed state of the post footing base was developed; it was developed the methodology for the determination of the sole size of central and non-central pressure-bearing post footing by plotting S = f (P); value tables of "?" to calculate the stresses at the post booting base with the influence of the void ratio of soils and the ratio of the footing sides were formed. Industry - construction.