the width of the roller; 
the weight of the roller. 
where B 
G 
As is clear from the secured equation, determination of the deformation 
properties of the soil in the form of a general parameter by experimental 
means does not cause great difficulty. For this it is sufficient to meas- 
ure the depth of the rut and the draft resistance of the roller with a con- 
sideration of the speed of its movement and the condition of the soil. 
Knowing the magnitude of the general indicator of deformation properties 
and the coefficient of lateral expansion of the soil by equation [2], it 
is possible to easily determine the magnitude of its modules of deforma- 
tion. Therefore, the parameter vy we take in the capacity of a basic index 
of the condition of the soil in the time of the first phase-compaction. 
The experimental equipment for determining this parameter consists of a 
trolley, on which were mounted the measuring apparatus (8ANCH-7m amplifier, 
N-105 oscellograph, power supply P-131) and the roller width B = 0.8 n, 
diameter D= 0.6 m and weight G = 280 kg. 
The study was conducted on a heavy-loam southern black soil, the moisture 
of which was maintained in the range of 18-20%. The load on the roller 
remained constant. 
The speed of movement was varied in the range from 0.3 to 1.2 m/sec with 
intervals of 0.3 m/sec, and the volume weight of the soil varied from 0.4 
to 1.4 g/cm. 
Each speed of movement of the roller and density of soil corresponded to 
5 replications of the tests. The draft resistance of the roller measured 
with the help of a dynamometer link, mounted between the roller and the 
trolley, was recorded on the oscillograph chart and worked up by the plan- 
imeter method. 
The depth of the rut was measured with an accuracy up to 0.5 m. 
The test data were worked up by the methods of mathematical statistics 
with the help of a "MROMIN-M" computer according to a standard program. 
Results of the experimental study are presented in Fig. 2. 
Since the coefficient M for soil varies in the range from 0.06 to 0.3 (8), 
then according to expression (2) in the range of error of the tests (9%) 
it is possible to determine the value of the modulus of deformation even 
with a maximum value of M = 0.3. With lesser values of M the accuracy of 
the calculations increases up to 0.5% (when M equals 0.06). The law of 
creation of the modulus of deformation E, in relation to the density of 
the soil and speed of movement of the natben is presented in figure 3. 
The value of E,, secured as a result of the study, is found in the range 
from 5 to 1.0 * 10° kg/cm*, which is confirmed by experimental studies of 
Kh. A. Rakhmatulina [6], A. S. Kushnareva [9], S. R. Meschyana [4,5], and 
other authors. 
