Abstracts

Soil Ecosystems

The rheological characteristics reflects ecological stability and technological characteristics of the soils in significant measure. However, rheological methods using in the soil science has no a broad spreading in general due to the objective difficulties first of all connected with the heterogeneity and polydispersity of the objects of study - soils. The objectivities of this investigation is the innovation of the engineering geology methods to the soil-ecological studies, the generalization of the some results yielded with the rotary viscosimeter “Rheotest-2” and a viscosity and shift voltages data processing.

Some methodical difficulties appear when the studies of different characteristics of soils are provided. First of all this is a determination of points of relative (Рк1) and dynamic limits of fluidity (Рк2). We considered that it is necessary to revise the proposition on that on the certain degree of dynamic test in viscosimeter the destruction of all linkages occurs through 3-5 minutes. Thus, in cause of weak structure aggregated soils the shift voltage leads to the destruction of primary structure and reduce it to the lower level of organization. Therefore, the surface area is increasing. A changing of an amount and qualities of linkages in the system (i.e. tested sample) is occurs. Our investigations have shown that stabilization of shift voltage under determined shift velocity can be delayed on several hours. We proposed to use fixed time of testing a sample on each degree of shift velocity. This is required for calculation of energy of the inherent system linkage destroying. In prospect this value is possible to use for describing of relationships toughness in soil matter. Namely use a function Ψli(Dr) - a dependency of the linkage energy potential from the shift velocity.

According to such approach, the namely unnecessary destroying all relationships in the system for the finding of points Рк1 and Рк2 it competent to use a graphics of relative increasing of Dr from Pi-Pi-1/Pi, on which points of minimum will be congruence with the limits of toughness. Thereby, mistakes connected with the system toughness difference and the time of testing a sample are become eliminated. Ψli(Dr) can be yielded as an internal friction power integrating (F).

For received consecutives of P values for each soil sample and for recognizing of the rheological curves with the same curve behavior in cause of the great data volume suitable using of the clusterizations methods. As our studies in this direction have shown in the total volume of Рi data the rheological curves of the soils, developed on heavy sorts of subsoil and soil horizons with the high contents of organic material are standing out. The further development of clusterizations methods usage will allow deciding problems, connected with the heterogeneity of soil profiles.

On the strength of conception of the degree of litification and its mechanisms the coupled using of a cluster analysis and linkage energy potential can be used for the determination of relative age of resedimented fine rocks, which is subsoil as a rule.

Note. Abstracts are published in author's edition

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