MODELING OF UNREINFORCED AND REINFORCED PAVEMENT COMPOSITE MATERIAL USING HISS MODEL

With the advent of high strength geogrids, the interest of civil engineers in using geosynthetics as reinforcelnent material in pavement construction has increased. An experimental study is carried out at JIT Delhi to understand the effect of geogrid in unpaved roads. Behavior of cOlnposite InateriaL \vhich comprises of Yamuna sand as subgrade and Water Bound Macadam (WBM) as base course is studied \vith and \vithout geogrid reinforcement under drained conditions. A gcogrid is used as reinforcing material. Drained triaxial tests were perfonned at three different confining pressures of 50. 100 and 200 kPa on both unreinforced C0l11posite and reinforced composite Inaterials of specimen size 100mm dian1eter and 200mm height. Hierarchical single surface (HISS) nlodel developed by Desai and co-workers is used to nlodel the unreinforced and reinforced composite material. A cOlnputer program PARA6 is used to calculate the various parameters and to back predict the stress-strain-volume change behavior of unreinforced and reinforced conlposite 111aterials. The predicted results n1atch closely with the observed results.