Influence of Rheological Properties of a Soil Layer Adjacent to the Working Body Cutting Element on the Mechanism of Soil Cultivation

Abstract

On the basis of rheological characteristics, stress fields and deformations, new methods of improving the mechanism of soil cultivation are substantiated in this article. The mechanism of soil destruction is observed. Paper investigates the process of changing the stressed-deformed state of the soil under the influence of the working body. To study the viscoelastic properties of black earth soil, the method of amplitude sweeping with a measuring system of parallel high planes was applied using a modular rheometer MCR-302 (Anton Paar, Austria). Range of linear viscoelasticity of virgin soil was found to reach 0.1% deformation; range of linear viscoelasticity of cultivated field area is smaller by an order of magnitude – to 0.02% deformation. Structure destruction (the point of equality of modules) of virgin soil occurs at 20% deformation; structure of long steam soil destructs at 8% deformation. Technique of measuring the isobar zones distribution in horizontal and vertical planes by means of special strain gauges of the LPX 5000 model was developed. To reproduce the force pattern of the working bodies’ effect on soil environment, the measuring complex MIC 400D is used; stress-strain state of the soil is defined.

Keywords

• stress field
• modulus of elasticity
• internal friction
• external friction
• rheological model
• stress-strain state