Features of the use of volume geo-grids for strengthening the slopes of the earth fabric of automobile roads

Abstract

Factors affecting the process of destruction of slopes of the earth bed are analyzed. Destruction of slopes is more intense, the lower the strength of the soil and the steeper the slope. The main way of strengthening slopes is to sow them with perennial grasses. But it takes 1-2 years, and sometimes more, for the formation of turf, and during this period, as a result of abundant snowmelt and intense rains, the soil is washed away from the strengthening surface. But currently, bulk geosynthetic materials are actively used to solve this problem. The main characteristics are the breaking load of the tape and the strength of the seam as a percentage of the strength of the tape. The use of these materials to increase the stability of embankment slopes is based on the joint work of the layer and the soil in the shear zone. The existing experience of using geogrids in strengthening slopes characterizes this material as reliable and high-quality, but there are frequent cases of unsuccessful works. As a result of the impact of the destructive effect of rainwater and meltwater runoff, local violations of the integrity of the fastening may occur, and in some cases, damage to the body of the slope, which can lead to a loss of its stability and slipping. When creating an anti-erosion coating of slopes, not only plant soil is often used, but also crushed stone, the size of which depends on the geometric parameters of the geogrid itself. The choice of a specific geosynthetic material with a certain size of lattice cells must be made depending on the purpose of using the material. According to the results of the analysis of the research, recommendations were formed on the approximate designation of the maximum permissible flow velocities depending on the material of the aggregate in the cells. It was established that the maximum allowable speed of the flow, which does not erode when filling geogrids with a certain material, increases by 30 % in relation to the allowable flow speed when using this material as reinforcement without geogrids.