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Effects on Soil Structure Caused by Different Undercarriages with the Same Contact Pressure

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2011 Louisville, Kentucky, August 7-10, 2011  1111203.(doi:10.13031/2013.37772)
Authors:   Rupert Geischeder, Markus Richard Demmel, Dr., Robert Brandhuber.
Keywords:   Soil compaction, soil stress, rubber belt track, tires, hose type pressure transducers, soil samples

The use of heavy machinery is increasing in agriculture today, therefore the risk of subsoil compaction rises. In the literature antithetic statements about different undercarriages concepts can be found. Therefore a field experiment was designed in order to study the effects of the same contact area pressure under a rubber belt, a large tire two times and a small tire four times. Vertical soil pressure was measured at four depths by installing soil pressure sensors. To determine soil deformation 600 undisturbed soil samples were taken out of two depths (0.15-0.20 m and 0.38-0.43 m) additional a cone penetrometer was used. The investigation shows considerable deformations in a depth of 20 cm. The maximum effect in the depth was detected by the wheel load 51.5 kN (two times). The rubber belt (113 kN) shows high pressure peaks only in 20 cm depth but it is not the same effect as four times 23.5 kN of wheel. Through the high tension by the rubber belt, the weight can be better firm up. The considerably established differences between track and tire argue for an unequal distribution of pressure under the tire with a high concentration in the centre of the contact area. The soil properties detected the problem driving under wet conditions over loosen soil in spring. Every treatment will easily compacting the topsoil. In this case, there was no differentiation between the undercarriages. Under terms of this field trail no effects detected in subsoil were detected.

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