Instrumentation & Measurement Magazine 24-7 - 36

before the tire arrived at transducer location in soil. When the
tire approached the top of the load cell location in the soil, due
to the movement of the wheel and the surface tension developing
forward in the soil, it caused an unloading mode in the soil
just before reaching that point. This led to a reduction in stress,
though short-lived. In the continuation of the front of the tire,
the stress increased to a certain extent in an approximate uniformity
and, after passing through the load cell, indicated a
downward trend along with some hysteresis. However, this
small amount of hysteresis could be reduced to a certain extent
by the stress caused by the creep and displacement of the soil
particles over the course of time; thus, the pre-stress in the soil
could have decreased.
In short, using the proposed method, the amount of stress
in the soil relative to the wheel location was recorded at any
moment. In other words, the obtained graph shows the profile
of the stress state in the soil from the moment the wheel is approached
to any point until the wheel passed from that point.
This information is useful in managing of soil compaction and
agriculture applications.
Obtained Data of Inclinometer
Fig. 8. Measured stress at a depth of 10 cm, velocity of 0.8 m / s and vertical
load of 2 kN.
Fig. 9. Average stress distribution for different distances from transducer at a depth of 10 cm, velocity of 0.8 m / s and
vertical load of 1 kN.
Fig. 10. Rut depth profile in specified load.
36
Rut depth effects were simultaneously recorded and saved
through passing the stress measuring path. As shown in
Fig. 10, the rut depth effects
are a function of path
length and forward velocity
per time unit from the
beginning to the end of
the road at the specified
region of the soil bin channel
(vertical load 3 kN). In
other words, with given
forward velocity and
path length of data acquisition,
data recording
time could be determined.
Based on earlier studies,
there has not been any
real-time measurement
system capable of measuring
and recording tire
effect profile. Thus, from
this point of view, the system
is completely new and
there are not any similar
results with which to draw
comparisons.
The rut depth profile,
which is dynamically recorded,
shows the vertical
position of the wheel at any
moment. Application of
these data is important not
only in relation to the estimation
of tire rut depth and
soil compaction, but can
also be used to determine
the geometry profile of the
wheel path. The wheel path
IEEE Instrumentation & Measurement Magazine
October 2021

Instrumentation & Measurement Magazine 24-7

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