Abstract:
This research explores the possible benefits to be derived from interactions between
wheels, for supporting a greater proportion of applied loads in the shallower soil layers.
This creates possibilities for reducing the risk of deep soil compaction. Previous research
indicated that different interaction modes occurred under simulated wheel arrangements,
being mostly dependent upon the spacing between them. Hence, field experiments were
arranged to investigate a range of spacings between dual wheels in practical situations.
Two field conditions were prepared providing loose and firm surface layers. Dry bulk
density, penetration resistance, wheel sinkage and contact area were measured under
each arrangement. A clear link was identified between results previously obtained in soil
bin tests and those in the field, confirming that spacing has a major effect on the potential
benefits. As wheel spacing decreased the interaction increased, inducing a greater resistance
in the soil surface layers to carry higher loads. The optimum range of appropriate
spacings and interaction modes identified in the laboratory tests was found to be applicable
in the field.
