Use Of Geo- Grids In Flexible Pavement Design

Abstract

As on 31st March 2021, estimates the total road length in India 6,603,293km (4,103,096 mi) making the Indian road network, the second largest road network in the world after the united states. But the roads are not giving the desired result due to poor CBR value. Roads in India have mostly the problems like the formation of potholes, ruts, cracks and localized depression and settlement, especially during rainy season. These are mainly due to the insufficient bearing capacity of the sub grade in water saturated condition. The sub grade soil mostly yields low CBR value 2-5%. In the CBR method of pavement design (IRC:37-2012) the total thickness of pavement increases exponentially with a decrease in the CBR value of sub grade soil which in turn increases the cost of construction. So, it has been tried to use the geo grid material for increasing the bearing capacity of the sub grade. Laboratory and simulated field CBR tests are conducted on soil samples with and without the inclusion of geo grid layer and also by varying the position of it in the mould. Use of geo grid increases the CBR value of the sub grade and thereby reduces the pavement thickness considerably up to 40%. This study will have a positive impact on cost as it will reduce the Project as well as maintenance