DEVELOPMENT OF A RHEOLOGICAL MODEL OF SOD PODZOLIC SOIL

To ensure optimal in mechanical cultivation of soil structure with plenty of agronomically valuable aggregates impermeable need to understand the processes occurring in the interaction of the working body of tillage machines from soil. It should take into account the features of the structure and organization of different types of soils. So slightlyligated sod-podzolic soils make up about half of all soils of Polissya and Ukraine's forest-steppe. Such soils require a special approach when machining to prevent the destruction of their available waterproof units. The sod-podzolic soil, as a polydisperse discrete deformed medium, has rheological properties. One of the methods that is widely used to describe the rheological properties of soils is the method of mechanical models. The mechanical model based on a combination of elastic properties (elastic element Hooke), viscosity (Newtonian viscous element) and ductility (Saint Venant’s plastic element). On the basis of these models are the differential equations of soil condition. In this case, the equations can be determined by tangential and normal stresses in the soil, which arise when loaded by its displacement or compression, as well as deformation of the soil. Different mechanical rheological models of the soil, peculiarities of their construction, as well as equations created on the basis of these models are investigated in the article. When constructing rheological soil models, they tried to create a universal mechanical model that would describe the properties of any soil. But, because depending on the composition, the soil may have very different mechanical properties, it is more appropriate to create mechanical models for a specific type of soil. This allows more precisely to describe the properties of the soil and tension, or the parameters associated with them. Some of the developed rheological models of specific types of soil are considered. A mechanical rheological model for sod-podzolic soils has been developed