Rheological properties of soils. Theory and experiment

The problem of preserving and increasing soil fertility is one of the most pressing environmental problems. Work on the fields of mobile agricultural machinery leads to a restoration of soils, causing a decrease in soil fertility. To develop scientifically based recommendations for the prevention of soil rehabilitation with anthropogenic influences, it is necessary to have the results of deep studies of the physico-mechanical properties of various soils. It is important to find dependencies between external loads and the corresponding soil deformations, taking into account the factor of time, that is, taking into account the rheological properties of soils. Sealing coherent soils are viscous -powered.
The book presents the results of theoretical and experimental studies of the processes of changes in the rheological properties and density of compacting liaison soils during dynamic loads, creep of soils after a short -term initial increase in various laws of external load, relaxation of voltages in soils after a short -term initial increase Various laws of soil deformations, mathematical modeling of these processes was performed. The results of field tests are given in which passages were carried out along the soils of wheeled tractors. The methods designed by the author are described by the author of creeping and densification of soils, relaxation of voltage in soils and allowing you to implement these methods of computer programs. The results of computer experiments performed according to these programs using experimental data are given. The quantitatively impact on the considered indicators of the initial density and humidity of the soil, the speed of increasing the initial load on the subsequent creep of the soil, as well as other factors.
The vertical vibrations of the front and rear axles of the wheeled tractors, the pendants of the front bridge are equipped with: 1) elastic springs, 2) elastic springs and shock absorbers. Mathematical models and methods for calculating the vertical fluctuations of the tractor axes during the operation of the tractor on the basis, the method of calculating the indicators of the compaction of the viscous soil during the operation of the tractor, taking into account its oscillations, are proposed. Using the obtained experimental data on the rheological properties of the soil and changes in the depth of the deformable soil layer of its density, a quantitative assessment of the effect of the speed of the tractor, amplitudes and frequencies of oscillations of the disturbing forces, shock absorbers on the amplitude of the vertical oscillations of the tractor, and the soil seal.
The book is intended for scientists involved in the study of the rheological properties of soils, the creation of methods for calculating indicators of a stress-deformed state and densification of soils during the operation of mobile machines and as a result of other external loads, the development of recommendations for reducing soil rehabilitation to preserve and increase fertility soils. The book may be useful to university teachers