The assessment of the coefficients of permeability of silicified soils during freezing
https://doi.org/10.52170/1815-9265_2024_68_83
Abstract
As a method to minimize frost heaving of the roadbed in adverse soil-hydrological conditions and during deep seasonal freezing, the application of silicification is possible. However, several questions remain open regarding the properties of silicified soil, particularly its water impermeability during the operation of the structure and the potential for creating a closed freezing scheme. In this regard, the aim of the research is to determine the dependencies of the coefficients of water permeability of silicified soil on the density of the binder and the plasticity index of the original soil, with an assessment of the influence of the freezing process on this parameter.
The methodological foundation of the work is formed by the design and conduct of laboratory experiments, incorporating elements of mathematical analysis for processing the obtained experimental data. Within the scope of the study, a laboratory experiment was conducted to determine the coefficients of water permeability in silicified clayey soils. Additionally, an experiment was developed and conducted to assess the influence of the freezing process on the coefficients of water permeability in silicified soil. The main laboratory equipment utilized in the experiments included a device for determining the coefficient of soil water permeability (PKVG-F) and an automated apparatus GT 1.1.12.
The research revealed a correlation between the coefficient of water permeability of silicified clayey soil and the density of the sodium silicate solution. At a density of the sodium silicate solution (concentration) exceeding 1.15 g/cm3, the material obtained as a result of silicification and the capillary barrier formed from it can be considered impermeable to water. The additional laboratory experiments conducted have shown that the freezing process for the silicified soil has minimal effects, causing no significant changes in its water permeability properties.
Supporting agencies: the research was carried out as part of the implementation of the Russian Railways grant for the development of scientific and pedagogical schools in the field of railway transportation.
About the Authors
D. A. Razuvaev
Siberian Transport University
Russian Federation
Russian Federation
Denis A. Razuvaev – Head of the Quality Control of Road Pavements and Subgrade Research Laboratory, Candidate of Engineering, Associate Professor
Novosibirsk
M. G. Chakhlov
Siberian Transport University
Russian Federation
Russian Federation
Mikhail G. Chakhlov – Research Associate of the Quality Control of Road Pavements and Subgrade Research Laboratory
Novosibirsk
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For citations:
Razuvaev D.A., Chakhlov M.G. The assessment of the coefficients of permeability of silicified soils during freezing. Bulletin of Siberian State University of Transport. 2024;(1):83-92. (In Russ.) https://doi.org/10.52170/1815-9265_2024_68_83
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