Effect of Bearing Capacity of Strip Footing on Reinforced Double Layer Soil System with Fly ash Stabilized Clayey Soil

This research was performed to investigate the effect of bearing capacity of strip footing on geogrid reinforced\ud sand overlay on stabilized expansive soil (i.e. double layer soil system) and check the different parameters\ud contributing to their performance using laboratory model tank tests. The parameters investigated in this study\ud include H/B (thickness of top sandy layer to width of footing) u/B (location of the 1st layer of reinforcement to\ud width of footing), h/B (vertical spacing between consecutive geogrid layers to width of footing), b/B (length of\ud the geogrid layer to width of footing). The effect of different H/B ratios and geogrid reinforcement N values on\ud the bearing capacity ration (BCR) and settlement reduction ratio (SRR) were also investigated. The results show\ud that bearing capacity increases significantly with increasing the H/B ratio as well as number of geogrid layers.\ud The bearing capacity for the soil increases with an average of 12.35% using H/B equal to0.5 and the bearing\ud capacity increases with an average of 35.76%, 75.56% & 230.83% while using H/B equal to 1.0, 1.5 & 2.0. It\ud also found that the use of sandy layers over flyash mixed clayey soil has a considerable effect on the bearing\ud capacity characteristics and the use of geogrid layers in the granular overlay has remarkable effect on Bearing\ud capacity ratio (BCR) & Settlement reduction ratio (SRR)