Abstract
Geotextile and geogrid are used routinely to reinforce the unpaved roads to enhance the serviceability and stability of these roads. Field performance studies were conducted on unpaved test sections reinforced with geotextile and geogrid to demonstrate how geosynthetics improve the test section performance using dynamic cone penetrometer (DCP). The influence of geosynthetic reinforcement was investigated by placing the reinforcement layer at subgrade-base interface, thus helps to achieve more sustainable unpaved test section. Direct shear tests were conducted on soil samples reinforced with geotextile and geogrid to investigate the improvement in shear strength of geosynthetic reinforced soil. The results of DCP test were demonstrated as dynamic cone penetration index value (DCPI, mm/blow). DCPI values were observed in range from 1 to 7 mm/blow, corresponding to 500 mm depth of penetration for unreinforced and geogrid-reinforced test section and 312 mm depth of penetration for geotextile-reinforced test section respectively. A decrease in DCPI value was observed for the geosynthetic-reinforced unpaved test section as compared to the unreinforced unpaved test section. Direct shear test results shows a significant improvement in the shear strength of soil samples reinforced with geotextile.
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