Geogrid reinforced road subgrade stabilization design methodology.

Nowadays an increasing number of unpaved roads and traffic areas are build using geotextiles. These unpaved structures are composed of a base layer placed on a subgrade soil and reinforced with one or several layers of georids. For a subsoil with insufficient bearing capacity, stabilization and improvement of subsoil charasteristics is necessary. The bearing capacity can be increased by excavation and replacement of the soft material, chemical stabilization by using chalk or by using geosynthetics. Placed between the subgrade and base course, or within the base course, the geosynthetic improves the performance of unpaved roads carrying channelized traffic and unpaved areas subjected to random traffic. This paper presents a design methodology for stabilizing a road subgrade using geogrid reinforcement