The article considers the issues of assessing the stability of non-standard soil-geological systems in difficult conditions. An analytical review of modern methods and tools for assessing the stability of embankment slopes is carried out. The features of the work of the embankment in the areas of the spread of permafrost are considered. The features of the design of embankments on permafrost soils with the preservation or partial thawing of frozen soils have been studied. Two versions of the calculated static schemes of sliding surfaces are presented: base - subgrade and base - subgrade - pavement. Based on the results of field studies, the physical and mechanical characteristics of the soils of the embankment and the base of the subgrade were determined, which became the basis for mathematical modeling and assessment of the stability of the embankment slopes. In software packages GeoStab and Geo5, based on the finite element method and the results of field studies, digital models of embankments were built on a weak foundation. The calculation of the stability of the system “base - subgrade” under the action of a standard uniformly distributed load has been performed. Two models of the system and the base - subgrade - road surface are considered: without cracks on the rolling strip and with cracks. It was found that coating defects affect the stability of the system only in the presence of an earthquake of medium strength and more. Recommendations for strengthening the slopes of embankments operating in difficult soil-geological conditions are given.
This work presents the results of research on the effects of compaction, moisture content and temperature on the coefficient of hydraulic conductivity of frozen and not frozen soils. Moisture permeability - the property of non-saturated soil to pass through its pores a non-continuous stream of water under the influence of moisture gradients, which provide gradients of absorption force. These forces arise due to the interaction of water with the surface of mineral particles and air. This is more a diffusion process than a filtration process. Clay soils of the earth bed within the depth of the seasonal thawing layer were selected for conducting studies of moisture-conducting properties of soils. Three series of tests were conducted. During all three series of tests graphs of dependence of coefficient of moisture conductivity (KW) are constructed and corresponding conclusions are drawn. When establishing experimental regularities, statistical data of experiments performed with 5-fold repetition were analyzed. Conclusions are reached concerning the migration of moisture in frozen and not frozen soils.
Off-standard soil-geological systems stability assessing issues under complex conditions is being discussed in this article. Modern methods and tools analytical review for assessing the embankment slope stability was performed here. Embankment work peculiarities in the areas of the permafrost soil spread were discussed in this paper. Special attention is paid to the embankments stability issue on a thawed foundation. The design features of the embankments on permafrost soils with the frozen soils preservation or partial thawing have been studied here. Two variations of sliding surface design-level static circuit are presented in this paper: base – earth bed and base – earth bed – road dressing. The main reasons that lead to the soil slopes stability loss of soil slopes are presented here. Based on the field research results, the embankment soil stress-related characteristics and the earth bed base were determined. Those results became the basis for embankment slope stability mathematical modeling and assessment. In software packages, GeoStab (demo) and Geo5 (educational license), based on the finite element method and the field research results, digital embankment models were built on a weak foundation. The «earth bed – road dressing» system stability calculation under the standard uniformly distributed load has been performed. Two system strengthening options are proposed to increase its stability: reinforcement with soil anchors and geosynthetic materials. The hypothesis sufficiency about the influence of the pavement road dressing state on the embankment stability was also tested here. Two models of the system and the base – earth bed – road dressing are discussed: without cracks on the track and with cracks on the track. It has been elucidated that coating imperfection affects the system stability only in the presence of medium or larger strength earthquakes. Recommendations for strengthening the embankment slopes operating in difficult soil-geological conditions were given in this article.
This work presents the results of research four soil samples were taken from the streets of the Gorny District, also tested for compressive strength before and after water saturation and swelling and estimation of physical and mechanical properties of soil stabilized by cement addition. The main aim of this paper was to estimate the optimal cement and water content in soil. The results of a study of the influence of the degree of compaction and temperature on the coefficient of moisture conductivity of thawed and frozen soils are presented. Plots of the dependence of the coefficient of moisture conductivity (KW) are constructed and the corresponding conclusions are drawn.
This paper presents the results of a study of the influence of the degree of compaction, humidity and temperature on the coefficient of moisture conductivity of thawed and frozen soils. To predict the calculated moisture content of soils in the working layer of the subgrade on sections of roads with a close occurrence of soil water level, a method developed by Professor I.A. Zolotar. Conclusions are drawn about moisture migration in thawed and frozen soils.
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