Impact of Multiaxial Propulsion System of Machine-and-Tractor Units on Soil Density

Use of the powerful tractors as a part of the machine-and-tractor units (MTU) is limited to high impact of their propellers (deformers) on the soil. The increase in tractor weigh and the multiple MTU passes result in overconsolidation of the soil. As a result, physical and mechanical soil properties are modified. The modified quality of soil structure is difficult to be restored entirely. As a result the intensive tilled soil degrades with time and all that creates the ecosystem disbalance of cultivated land. The power method based on regularities of absorption of energy by various soil layers was applied to calculate indicators of soil consolidation. The energy method based on the regularities of the energy absorption by different soil layers was applied to calculate the soil consolidation rate. The conducted researches show that at a pressure of 150 kPa and humidity of 19.2 percent the soddy podzolic loam sand soil density increased from 970 to 1260 kg per cubic metre. The increase in number of the drive system axles can reduce the consolidation of the topsoil as well as lower layer.The intensity of decrease of soil panning considerably decreases when quantity of axes is over four. If the pressure upon the high workhardening soil is constant (the sizes of wheels increase at reduction of axes quantity) then the reducing of the dip of the wheel track can be obtained by increasing the number of the drive system axles. On the low work-hardening soil the effect of reduction of depth is not so much. Increasing the number of axles and the size of wheels for low work-hardening moisty soils is equally effective for reducing the dip of the wheel track. For the overmoist soils it will be better to increase the sizes of a basic surface of running system. If the number of axes is more than four then the decrease of high work-hardening soils consolidation will be less intensive.

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