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On numerous construction objects both of road (automobile and railway), and industrial civil industry, geosynthetic materials of various types and characteristics are applied. The purpose of this work is experimental definition of influence of reinforcing of crushed-stone layers of road carpet by volume geogrid on shift stability. For the research of the crushed-stone layers reinforced by geogrid by criterion of shift stability, experiments in the laboratory of department of "Industrial transport" of SaintPetersburg State Forest Technical University under name of S.M.Kirov are executed. Materials for the research are three fractional compositions of crushed stone: screenings of 0-5 mm; fr. 5-20 mm; fr. 20-40 mm. Reinforcing is made by GEO OR geogrid 20/5 with a size of cell of 16х16 cm and edge high of 5 cm. As a result of comparative tests of crushed-stone materials of different fractions for shift in the horizontal plane with the use of geogrid and without it, significant experimental data have been obtained. It is experimentally received that the angle of internal friction in the reinforced designs has increased in crushed stone layers fr. 5-20 mm and in fr.20-40 mm, in layers of crushed-stone screening fr.0-5 mm, ta decrease in the angle of internal friction takes place. Specific coupling has boomerang effect in relation to the angle of internal friction; when reinforcing crushed stone, fr. Лесоинженерное дело  128 Лесотехнический журнал 4/2016 0-5 mm, increase in specific coupling, and in crushed stone, fr. 5-20 mm and fr. 20-40 mm – reduction. Because of considerable influence of the angle of internal friction of large fractions of crushed stone on resistance to shift loadings, it is necessary to consider crushed stone with fraction of more than 5 mm to be optimal fractional composition of crushed-stone material for reinforcing by a geogrid.

Influence of geogrid reinforcing of crushed-stone materials on the effect of shift loadings