关键词: 土工格栅, 模型试验, 地基沉降, 水平位移

Abstract: To explore the bearing capacity and deformation characteristics of geogrid reinforced foundations, this paper designs and performs model tests with 5. 7 and 17 layers of geogrid reinforced foundations. The settlement, lateral earth pressures and horizontal displacement of the reinforced earth soils are compared with the performance of natural soil with reinforcement. The results indicate that, for soil without the reinforcement, the surface soil settlement increases significantly after the foundation pressure greater than 400 kPa, the the soil demonstrates an obvious brittle failure mode. Using the same settlement magnitude at an ultimate bearing capacity of 400 kPa as the reference value, the bearing capacity for 5 layers of geogrid reinforcement is 505 kPa, 565 kPa for 7 layers and 660 for 16 layers of reinforcement, respectively. Under the same settlement value, various reinforcement layers of geogrid increase 26%, 39.5% and 63.5%, respectively. The foundation soil receives a significant improvement. After the geogrid improvement, the lateral earth pressures, horizontal displacement are reduced comparing with the natural soil without the soil reinforcement. 

Key words: Geogrid, Model Test, Foundation Settlement, Horizontal Displacement