Abstract
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.
Highlights
The assessment of the bearing capacity of base and slopes is an important scientific and technical task of the design of roads and protective engineering structures
At present time this area of soil mechanics has well developed in the field of theory and mathematical modeling [4 – 8]
The roads on permafrost soils are unique engineering structures operating in difficult climatic conditions, all typical design solutions must be adapted to specific conditions of the terrain
Summary
The assessment of the bearing capacity of base and slopes is an important scientific and technical task of the design of roads and protective engineering structures. The stability of soil slopes and embankments of the subgrade depends on the physical and mechanical properties of materials, which can change under the influence of many natural and technological factors: rainfall intensity, moisture content of material, seismic activity, static load (weight of the embankment and standing vehicles), uneven dynamic impact of transport load, level of solar radiation and other factors [1 – 3] At present time this area of soil mechanics has well developed in the field of theory and mathematical modeling [4 – 8]. One of these problems is ensuring the reliability of the system «subgrade – pavement» on a thawing base. This direction in construction is important because most of Russia is located in the territory of permafrost soils, and issues such as traffic safety, expansion of the network of roads and railways, development of new territories in difficult geocryological conditions are an important strategic task of the government
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