Finite Element Analysis of Reinforced Cushion on Soft Soil Subgrade under Embankment Loading

The finite element numerical simulation of reinforced cushion by geogrid is established based on ADINA software,then the vertical displacement and lateral displacement of soft soil subgrade and geogrid reinforced cushion with different reinforcement layers,modulus,reinforcement clearance are calculated.The results show that adoption of geogrid has a large reduction of vertical displacement and lateral displacement;the best reinforced layers are 3 layers for paving multi-layers geogrid;the restriction effect of geogrid on the vertical displacement and lateral displacement becomes bigger with increasing of reinforcement modulus,and geogrid modulus more than 0.5 GPa has a better reinforcement effect;geogrid will have a best restriction effect on the vertical displacement and lateral displacement when the depth below the footing of the first layer of reinforcement is 0.2 m and the reinforcement clearance is 0.4 m.