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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.

The article is devoted to the improvement of criteria for determining highways iterrepair periods. The authors reveal the importance of technical and operating characteristics, vehicle operating status and techno-economic parameters of roads. Analyzes the existing assessing the quality criteria of state highways that affect their compliance with consumer properties.The possible main criteria that determine the necessary composition and periodicity of carrying out of major repairs of roads of different categories and in different climatic zones.

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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.