The substantiation of the tense state of soil under condition of its interaction with wheels

Abstract

Machine and tractor devices which consist of large tractors and devices corresponding to them, are widely used in the fields. The use of such machine- and- tractor devices results in reduction of both energy usage and labor inputs. But the wheels of large tractors deform and consolidate the soil that results in changes of healthy soil structure as well as in worsening of the agro-ecological soil condition. The use of large machine- and tractor devices requires laying down of optimal constructional parameters for wheels. Optimized wheels will facilitate the decrease of both consolidation and devastation of the soil’s fertile layer. The paper considers the interaction between the soil and the wheels. The scheme for determining the distribution of tension in soil under condition of vertical loading, has been developed. The task for the calculation of the tense state of soil has been formed. This task makes it possible to determine the level of tension in soil under the wheels of machine- and- tractor devices. The determination of the level of tension in soil enables to determine and to substantiate the parameters of the wheel tires. The use of such tires will make it possible to provide the level of normal state of tension in soil lower than a permissible level. As follows from solving a reverse contact problem, and under condition of equal distribution of contact pressure, a mathematic model has been received. The received mathematic model makes it possible to perform a computer simulation of the effects of wheels’ width of the machine-and-tractor devices on tension which takes place in soil. The received model is universal and makes it possible to carry out the study of wheels of various standard sizes. A theoretical simulation of the performance of a machineand-tractor device has been made. The distribution of tension in soil environment is given.