Abstract
Operation of off-road vehicles on soil generally produces changes in its state. Of the many variables involved in the soil-vehicle interaction wheel slip is one of the most important, producing a higher density in the soil during machinery operation. Soil types and conditions and the size of tyres of the off-road vehicles, all governing the performance of the machinery in the agricultural field, were considered in this study. The compaction was found to reach a maximum between 15 and 25% slip and was less at higher slip rates. At higher slip rates, the soil was disturbed and thrown to the sides of the tyres causing deep ruts. The usual operating value of 20% slip was found to be in the range of slip causing the greatest compaction. Laboratory shear box tests were performed at three different normal pressures with and without shear for sand and sandy loam. The results of these tests confirmed the field test results.
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