Korolkov R. The design method of the highway embankment slopes reinforced by geosynthetical materials

The thesis is devoted to the design method development of the highway embankment slopes reinforced by geosynthetical materials taking into account the deflected mode change of their construction. At the present stage one of the promising trends of the construction period reduction, structure strength provision, and built-on areas reduction is soil constructions reinforced by geosynthetical materials. In the course of study a mathematical model of the roadbed deflected mode taking into account the changes in the construction of highway embankments is developed. New calculating dependences for the required quantity of the reinforced geosynthetical layers calculation and the length determination of the geosynthetical laying in the embankment taking into account the changes of its deflected mode are obtained. Laboratory research of the soil interaction with geosynthetical layer is carried out. During the research the factor of the soil interaction with geosynthetical materials (geotextiles and geogrids) is obtained. At the soil slippage: for geotextile and loam is 0.75, sand - 0.90; for geogrids and loam is 0.82, sand - 0.91. At the geosynthetics pulling from the embankment body: for geotextile and loam is 0.57, sand - 0.71; for geogrids and loam is 0.73, sand - 0.81. The design method and design procedure of the required reinforcement for embankment slopes regulation taking into account the changes of their deflected mode are developed. The technique allows to reason engineering decisions on the reinforcement of the highway embankment slopes avoiding laborious calculation on the circular cylindrical sliding surface method. This technique also allows to take into consideration the changes of forces acting on the geosynthetical layer in connection with the staging of the embankment construction. Key words: highway, slope, geosynthetical materials, reinforcement.