Abstract
This article presents the way to prevent deformation of linear structures build on sliding slopes. The offered structure is built on thawing permafrost soils. Some results of scientific research and engineering calculations of options for rational design of roads located in cold regions of Russia are given as an example of a highway construction. The highway is constructed in complicated climatic and engineering-geological conditions. There are occurrences of insular permafrost and a wide spread of deep seasonal freezing. Melting permafrost requires special treatment in construction due to changing their temperature and humidity conditions. Thus, the structure includes installation of piles in slopes and their interconnection in a pilework by means of a vertical geogrid rigidly connected to pile caps and vertical geogrid layers. The work stage from cap bottoms to the first layer of a horizontal geogrid and interlayers between geogrids are filled with the crushed stone compacted. The horizontal geogrids are installed on account of their partial location in a no-float soil body of the slope or natural downhill. Modelling of the structural behavior with the geotechnical software complex «FEM models» estimates the gravitational effect of a sliding body of earth. The reliability of the structure is confirmed by regular measurements and observations on the highway section. On the basis of the research results some structural measures for providing operational reliability for highway rational designs in the northern territories of the Russian Far East are offered.
Highlights
Project construction in the Russian Far East, the Chita Region and Yakutia is always connected with frost and seasonally freezing soil risks [1,2,3,4]
The complexity of the highway project in the Chita Region is connected with permafrost in the base and its thaw-freeze due to changing the temperature and humidity conditions, requiring some special treatment in the project construction [6,7]
The results show that the slip surface is located in the layer of thaw overmoistured clay loam soils of a little thickness located above the top line of permafrost causing the soil body movement [16,17]
Summary
Project construction in the Russian Far East, the Chita Region and Yakutia is always connected with frost and seasonally freezing soil risks [1,2,3,4] It is especially true for the linear transport projects that require high reliability and responsibility standards. The designed structure serves for a compensation of the horizontal and tangential components from the gravitational impact of the sliding body of earth on the given section of terrain Though it is considered a passive measure alongside with the active ones, such as the interception ditch construction with a complete isolation of the surface water and the permafrost insulation from its degradation, the structure is an integral part of the complex measures in the stabilization period for providing the operational reliability of the whole construction and the traffic safety on the deformed section until the active measures work in full (Fig.1, 2)
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