Influence of tyre inflation pressure on stress and displacement in the subsoil

Sammanfattning

High wheel load introduces a risk for subsoil compaction. In principle, it should be possible to avoid compaction by reducing ground contact pressure so that stresses in the soil are lower than the soil strength. The objective of the study presented here was to study the effect of reduced tyre inflation pressure on stress and displacement in the subsoil under a self-propelled sugarbeet harvester. Measurements of soil displacement and soil stress were made at a wheel load of 81.6 kN. The tyre was a Trelleborg TWIN 800/60-38 used at tyre inflation pressures of 220 and 90 kPa. Wheeling was made at a water content close to field capacity. Soil displacement and vertical soil stress were measured at 30, 50 and 70 cm depth, and precompression stress was determined on soil from the same depths. Ground contact area of the tyre was measured on a hard surface. The measured contact area correlated well with the tyre inflation pressure. Soil stress and soil displacement at 30 cm depth were approximately double for 220 compared to 90 kPa inflation pressure, and differences were statistically significant. Measured stresses at this depth were considerably higher than the inflation pressure, possibly due to an uneven distribution of stresses within the tyre imprint. There was a tendency for lower stress with low inflation pressure at 50 cm depth, while no differences could be seen at 70 cm depth. The measured soil stresses correlated reasonably well with calculations of stress distribution in the soil. Soil displacement occurred at 50 and 70 cm depth despite the fact that the precompression stress was higher than the measured soil stress. The results show that for a given tyre, reducing tyre inflation pressure may have a large influence on compaction in the upper part of the subsoil, while effects deeper in the subsoil are small. In this experiment, compaction occurred at 50 and 70 cm depth despite a relatively low inflation pressure of 90 kPa. The results demonstrate the difficulty of avoiding subsoil compaction at high wheel loads.

Nyckelord

subsoil compaction; sugarbeet harvester; soil stress; soil displacement; tyre inflation pressure

Publicerad i

Advances in Geoecology
2002, volym: 35, sidor: 331-338
Titel: Sustainable Land Management - Environmental Protection : a soil physical approach
Utgivare: Catena Verlag

Konferens

International Conference on Sustainable Soil Management for Environmental Protection

SLU författare

• Arvidsson, Johan

  • Institutionen för markvetenskap, Sveriges lantbruksuniversitet
    

• Trautner, Andreas

  • Institutionen för markvetenskap, Sveriges lantbruksuniversitet
    

• Keller, Thomas

  • Institutionen för markvetenskap, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Markvetenskap

Publikationens identifierare

• ISBN: 3-923381-48-4

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/39986