Most state highways in Maharastra state have problems of foundation with highly compressible clay locally known as Black Cotton soil. Large scale deformation, pavement failure etc. results in repeated renewal of pavement. Vhereas the existing roads are of inadequate design . based on increasing traffic load and intensity, most of these areas are prone to heavy rainfall. Pore pressure dissipation is difficult in most terrain, where ground is rolhng with abutting fields being in higher elevation and are much irrigated due to Sugar cane cultivation.
This paper deals with two case histories in Maharastra State where the pavement renewal program is supplemented with modem analysis, strengthening solutions and crack retardation design using Geosynthetics.
The remedial measures are designed to improve and strengthen the road section including subsurface drainage facility for the road subgrade to reduce the hydrostatic pressure at the base of the road crust and strengthen the road structure with suitable system to reduce the vertical stresses over the subgrade soil in both these sites. Whereas in one site Geogrids were used to strengthen as well as to prevent reflective cracking of pavement, the other site used Geogrids as reinforcement followed by Nonwoven Geotextile for effective sealing against water percolation, improving bonding of surface wearing against water percolation, improving bonding of surface wearing course to the pavement and provide adequate camber in the road pavement in the leveling/correction course for improved surface drainage.
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