Influence of Reinforcement Type on Foundation Soil Bulge During Anchor Pullout
摘要
This research paper details the effect of the type of reinforcement on anchor pullout capacity and soil bulging dimensions. A series of laboratory model pullout tests were performed using sand placed at a relative density of 70% in a test tank of 1 m × 1 m × 1 m. A mild steel rigid circular plate anchor having a size (D) of 100 mm was placed at an embedment depth of 4D for all the model tests. Commercial woven polypropylene geotextile and polypropylene biaxial geogrids were used as reinforcement materials. Irrespective of the type of reinforcement, the model tests were performed by maintaining the same geometrical parameters and placed directly above the plate anchor. The test results revealed that the anchor uplift capacity compared to the unreinforced case increases to 11 and 53% with the respective geotextile and geogrid reinforcements, even though the reinforcement geometrical parameters (i.e., embedment depth and size of reinforcement) are the same. It could have happened due to a difference in the reinforcement mechanism developed at the sand-reinforcement interfaces. Interestingly, the soil bulge dimensions for the reinforced soils are 59.8% (geotextile) and 45.35% (geogrid) higher than unreinforced conditions. Even though the geometrical parameters are the same, the soil bulge amount with geotextile reinforcement is 10% higher than the geogrid reinforcement. It might have occurred due to the presence of apertures of geogrid reinforcements, the amount of bulging of sand is lesser than the geotextile reinforcement under similar geometrical conditions.