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Historic, Archive Document
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[... ... DATA SHEET]
Report No. NTML-WRG-553, Report Date 25 April 1977, NAL ... Translation No. [blank]
Author(s): Rozhkov, N. P.; Baukov, A. V.
Title: THE PROBLEM OF DETERMINING THE DEFORMATION PROPERTIES OF SOIL [K voprosy opredeleniya deformatiznykh wvoistv pochv]
Translated from: Scientific Reports of the Ukranian Agricultural Academy, 1973. Issue 100, pp. 100-115. [Nauchnye Trudy USKhA (Ukrainian S-Kh. Akademiya) Vyp. 100, s. 100-115, 1973.]
Translated by: Dr. William R. Gill, Soil Scientist, USDA, ARS, SR, National Tillage Machinery Laboratory, P. O. Box 792, Auburn, Alabama 36830
Abstract: A study was made of the deformation of the soil by a roller. The deformation properties of the soil were decreased significantly both by increase in soil bulk density and speed of movement of the roller. The modulus of deformation conversely increased with these same values.
Keywords: Rollers, deformation, bulk density, soil compaction, translations, USSR
Available from: U.S. Department of Agriculture National Agricultural Library Division of Lending Beltsville, Maryland 20705 OR Translations Department The John Crerar Library 35 West 33rd Street Chicago, Illinois 60616
(When ordering refer to NAL ... Translation No. above as well as author and title.)
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THE PROBLEM OF DETERMINING THE DEFORMATION PROPERTIES OF SOIL
[K voprosy opredeleniya deformatiznykh svoistv pochv]
N. P. Rozhkov, A. V. Baukov
(Scientific Reports of the Ukranian Agricultural Academy, 1973, Issue 100, pp. 100-115.) [Nauchnye Trudy USKhA (Ukrainian S-Kh. Akademiya) Vyp. 100, s. 100-115, 1973.]
As is known, the soil is a complex elastic-viscous-plastic media [7] possessing a whole series of properties, the study of which are very difficult. Therefore, for improving the physical nature of the phenomenon occurring during the interaction of working tools of agricultural machines with the soil, we are ordinarily limited by a small number of indices of its condition.
The process of deformation of soils, as has been shown by studies of V. G. Berezantsev [2], A. S. Kushnarev [10], and other authors, consists of two phases: 1. (phase of compression/local shear); 2. phase of significant shear.
In the first phase a converging together of the particles occurs, and their density increases because of an isotropic compression. The force of the pressure during this does not exceed the limit of strength of the soil.
With a further increase of pressure a second phase starts -- the plastic flow of the soil along the surface of the limiting resultant (surfaces of significant shear). The limit of load in this phase depends on the coefficient of internal friction and cohesion of the soil.
In the first phase between compacting pressures and relative deformation of compaction (elastic and residual) there exists a linear relation [1,3], characterized by the modules of deformation E0. The magnitude of it depends on the type of soil, its moisture density and method of loading [4,5,6,8].
The large interval of the values of the modulus of deformation [4,6,8] causes the necessity of determining its magnitude for each type and condition of soil with a definite speed of loading, which must equal the speed of movement of the soil working tools.
The deformation corresponding to the first phase is made more sharply with an interaction of a smooth roller with the soil. During this it is suitably accurate to consider the speed of loading.
We will examine the scheme of interaction of the roller with the soil (Fig. 1), the pressure of which does not exceed its limit of flow.