This article presents the findings of a study of applicability of fiberglass dowels for reinforcement of soil slopes and downhills in geological conditions of the Greater Sochi. Within the framework of the performed surveyes, the analysis of the data array on engineering-geological conditions has been executed, physical- and mechanical properties of soil properties for the Greater Sochi have been defined. According to the results of mathematical modeling in the software complex PLAXIS, applicability of using fiberglass dowels and its scope of application has been determined. Economic efficiency in comparison with the widely-used soil dowels Titanium has been herein estimated.According to the survey findings multiple landslide areas with surficial character of formation, which currently do not threaten the safety of human life, are identified. However, lack of timely measures on fixation of the above said slope areas may lead to the development of global deformations.

During the construction of roads in mountainous areas, engineering protection of the highway from landslide processes is often required. Currently, there are many designs used to protect against landslides. However, the engineers are faced with the task of choosing the optimal structural solution both in terms of the boundaries of the field of application of the structures and in terms of economic efficiency. In addition, the problem arises of correct modeling of the predicted situation. The article discusses the engineering protection of the road under construction in Sochi, Krasnodar Territory. In the study of the territory on the site, three landslides were found that are in extreme condition, erosion processes, an elevated level of groundwater, planar flushing, and also weathering of bedrock when they are opened during the laying of the route. Two schemes of constructive solutions using gabion construction both on a natural basis and on a pile are considered. The choice of the type of protective structure is determined by the presence of both surface and ground waters, as well as by a technical and economic comparison (in comparison with a reinforced concrete retaining wall). The authors reviewed existing software systems used in the calculation of underground structures, and also analyzed the basic methods for calculating the slope stability and structural strength. As a result of the study, such geotechnical software systems as: Plaxis, GeoStudio, Geo5 were selected to simulate a landslide slope. Slope stability was determined both for the main combination of loads and for the special one (seismic of 8 points) using such methods as: Phi/c reduction, Morgenstern-Price method and Shahunyants method. The results obtained showed good convergence.

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During the operation of the M-27 highway, a landslide became active on the km 56 + 680 section of the Tuapse district (Russia). As a result of the landslide masses displacement, the roadbed was destroyed and, as a result, traffic was restricted. In emergency situations, with the rocks’ continued displacements, it was necessary to develop the constructive solutions for the landslide structures in a short time. Engineering protection of roads on landslide slopes requires a detailed analysis of the source data, as well as a set of calculations to determine the designed structures’ strength and the slope’s stability. However, in emergency situations, it is often necessary to install the structures even with insufficient initial data based on a visual inspection of the site, as well as archival data. The article presents the results of a landslide site survey, as well as the results of modeling a slope with various combinations of loads. In addition, the constructive solutions of both priority measures and the main landslide control structures are presented.

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