Abstract:
The paper establishes the
value of the average pressure at the contact
surface level between the soil and the tires
of the following vehicles and trailers: the U-
650 and Valtra T-190 tractors, the 2RB5AT
and 7RBAT trailers and the large dump
capability Iveco Trakker 8x4. The wheelground
pressure is determined as the report
between wheel corresponding weight and
the contact surface area with soil. This area
was obtained by calculation, using 12 types
of equations established by different
authors. In this paper, we used the average
of the 12 versions, both for the wheel-soil
surface and for the wheel-ground pressure.
It was found that the lowest wheel-ground
pressures are recorded for the Valtra U-650
and T-190 tractors (63,535 ... 142,821 kPa)
and the highest in the case of the 7RBAT
and 2RB5AT trailers and the Iveco Trakker
8x4 dump (432,692. .. 623,414 kPa), the
maximum imposed limit by agricultural
requirements being 100 kPa. Regarding the
tractors, the exceeding of the imposed limit
(100 kPa) is recorded for all the wheels of
the Valtra T-190 tractor and only for the
front wheels of the U-650 tractor. These
excesses are quite small (10 ... 42 kPa), so
practically will not affect soil properties.
For the trailers and dump, the wheel-ground
pressure is 4,3 ... 6,2 times higher the upper
limit imposed for agricultural soil, 100 kPa.
These high pressures don’t affect the asphalt
or concrete roads, but will adversely alter
the physical properties of agricultural soils.
