路堤荷载下加筋垫层加固软土地基的有限元分析

基于ADINA建立了土工格栅加筋垫层的有限元模型,对未加筋地基和不同加筋层数、不同加筋模量、不同加筋间距的加筋地基进行计算,分析了各种情况对地基沉降、侧移的影响.结果表明铺设格栅能有效控制软土地基的沉降和侧向位移;铺设多层格栅时最佳加筋层数为3层;随着加筋模量的增大,格栅对竖向沉降和侧向位移的约束作用增强,格栅模量为0.5 GPa以上时能发挥很好的加筋效果;加筋深度为0.2 m,间距为0.4 m时,格栅对沉降和侧向位移约束效果最佳.

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.