GEOCOMPOSITE INTERLAYER FOR ROADBED OF MOTOR ROAD Russian patent published in 2008 - IPC E01C3/06 

FIELD: road building.

SUBSTANCE: proposed geocomposite interlayer for roadbed of motor road features stable draining and capillary breaking properties and watertightness over lower plane. It provides nonwettability of soil and reliable removal of water to slopes of road-bed at provision of designed cross gradient in interlayer. Invention makes it possible to use proposed geocomposite interlayer instead of sand draining layer, thickness up to 40 cm, and provide required optimum moisture content in working layer of roadbed. Novelty is that geogrid is provided with geocloth from top and bottom and additional watertight film is placed between lower plane of geogrid and lower layer of geocloth. Geogrid has three-level structure of arrangement of component members forming cells in geogrid of size preventing coupling of upper and lower layers of geocloth. Members of middle level of structure of geogrid have section height exceeding section height of members of lower and upper levels of geogrid.

EFFECT: improved quality of roadbed.

2 cl, 3 dwg