Mokritskaya T.P., Tushev A.V. On some soil subsidence estimations based on the particle size distribution
- Details
- Parent Category: Geo-Technical Mechanics, 2018
- Category: Geo-Technical Mechanics, 2018, Issue 143
Geoteh. meh., 2018, 143, 118-126
https://doi.org/10.15407/geotm2018.143.118
ON SOME SOIL SUBSIDENCE ESTIMATIONS BASED ON THE PARTICLE SIZE DISTRIBUTION
1Mokritskaya T.P., 1Tushev A.V.
1Dnipro National University named by O. Gonchar
UDC 624.131.4 (477)
Languige: English
Annotation.
In our previous investigations we studied subsidence of soils, which are alluvial, alluvial-dealluvial loess-like deposits of the Middle-Upper Pleistocene age, lying on the Right-Bank Loess and Upland Plain (Middle Dnieper, Ukraine). In this paper we study Neogene clays. Under some additional conditions of fractal nature of the loess soil, obtained certain predictive estimations of the coefficient of porosity after the disintegration of micro-aggregates. We discovered that under such conditions two different situations of particles packing may occur after disintegration of micro-aggregates. Let k′ be the coefficient of porosity and K′ be the porosity of the soil after the disintegration of micro-aggregates. These situations strongly depend on the fractal dimension of particle distribution by size. The results of our experiments and calculations show that on the basis of the new theoretical models and the "Microstructure" technique, having the values of the fractal dimension of the particle size distribution, it is possible to forecast the volume deformations after the disintegration of the micro-aggregates. With dispersed and semi-dispersed methods of preparation, the micro-aggregates disintegration occurs, resulting in increased content of fractions less than 0.01 mm. Unlike loess soils, with the semi-dispersed method of preparation, increased content of clay particles is characteristic for red-brown clays. Depending on the type of loess soil and specific experimental conditions, there may be the subsidence deformation, swelling or suffusion. By using the results obtained, we study properties of undifferentiated Neogene-Lower Quaternary, Neogene clays selected in Nikopol and Kamenskoye. The predicted values of the porosity coefficient will vary from 0.499 to 0.635 for different types of exposure, accompanied by the decomposition of aggregates. The most resistant to different types of impacts were undifferentiated Neogene-Lower Quaternary red-brown clays. The method allows you to develop a new classification of soils, based on the stability of the soil structure as the stability of micro-aggregates.
Keywords:
loess, fractal, porosity, deformation, granulometric analysis
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About the authors
Mokritskaya Tetiana Petrivna, Doctor of Geology (D.Sc.), Associate Professor of the Department of Geology and Hydrogeology, Professor of the Department Sciences about Earth, DNU named byOles Honchar, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.
Tushev Anatoliy Volodymyrovych, Doctor of Physics and Mathematics (D.Sc.), Professor, Professor of the Department of algebras and geometries, DNU named by Oles Honchar, Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.