Determination of influence of the microstructure on the physical and mechanical properties of loess soils in Dnieper region


  • K. O. Samoilych Oles Gonchar Dnipropetrovsk National University,

Abstract

The aim of my work is to identify, study and analyze of the microstructure of loess soils of Dnieper region. The main task of this work is to determine the composition, structure and properties of loess soils of Prydniprovya, according to new experimental technique that has been used previously in Ukraine. This technique allows to make a forecast of changes of granula composition of loess soils due to their degradation. The subject of the research will be microstructure of loesses and the nature of its structural links, the impact of structural changes on the strength and deformation properties of soils. Microstructureof loess sediments and its change during technogenesis is a factor that affects their deformation behavior. The object of the research will be loess soils, which are the most widespread in the zone of influence of man-made buildings in Dnieper region (for example gullies «Tunnelna», «Zustrichna», «Evpatoriyska»). To be the first in Ukraine in introduction of a new method "Microstructure", to determine the particle size distribution of loess soils of Prydniprovya, to determine the structural strength of the soil and its connection with the peculiarities of the microstructure of loess soils in Dnieper region.Results shown are the properties of loess soil research that was conducted by yourself as part of state budget theme "Experimental determination and prediction of changes in subsidence of properties (degradation) of loess soils by technogenesis". I investigated the physical and physical-mechanical properties, identified of the most common microstructure type of paleo- PIII df, e PIII vt and of loess soils vd PIII ud, vd PII  dn in Dnepropetrovsk. Particular sized is tribution of loess and paleosoils is determined by a pipette of  three ways to preparation the soil analysis (dispersed, standard and aggregate). As a result of particle size analysis method "microstructure" was dedicated classification code fo reach soil. His transcript describes is the basic parameters for each of the microstructure of soils. Found that dofinivskyy horizon (e PIII df) is aggregated type of microstructure, vitachivskyy (e PIII vt) – mixed (skeletal-aggregated), and they liy below udayskyy (vd PIII ud) and dneprovskij (vd PII  dn) – mixed (aggregatal-skeleted). I revealed the presence of silty the soil mixed with large type and elementary structural model. Aggregates composed of different sized particles with a predominance of fine clay and sometimes coarse silty particles.The dependence between the type of microstructure of loess is the soil and their subsidence. It was found that the type of soils of aggregate subsidence return lower than mixed (aggregatal-skeleted).Keywords: microstructure, aggregates, loess soils, physical and mechanical properties.

Author Biography

K. O. Samoilych, Oles Gonchar Dnipropetrovsk National University,
  senior laboratory assistantDepartment of Hydrometeorology and Environmental GeoscienceOles Gonchar Dnipropetrovsk National University, 

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Published
2016-05-31
How to Cite
Samoilych, K. (2016). Determination of influence of the microstructure on the physical and mechanical properties of loess soils in Dnieper region. Journal of Geology, Geography and Geoecology, 24(1), 125-132. https://doi.org/https://doi.org/10.15421/111619