饱和粉土复合地基数值模拟

Numerical Simulation of the Saturated Silt Composite Foundation

通过分析对比可液化饱和粉土地基的三种复合地基形式,总结三者的抗液化性能。结果表明:(1)天然饱和粉土地基不同深度处超静孔隙水压力曲线发展趋势基本一致,但浅层地基处超孔压会有小幅下降,而孔压比的分布规律是浅层较小,中层与深层较大;(2)降低孔压方面,多类型桩(碎石桩+CFG桩)复合地基相比于碎石桩复合地基,在浅层与中层处理效果相差不大,但在深层处后者处理效果更好;(3)减小竖向变形方面,多类型桩(碎石桩+CFG桩)和CFG桩比碎石桩控制的效果好,且多类型桩能更好地减小竖向变形。

Using numerical analysis and comparison of three types of composite foundations used to treat liquefied saturated silt,a summary of the anti-liquefaction performance of the three types of composite foundation was determined.The experimental results showed that：（1）the development trend of excess pore pressure of natural saturated silt was the same at different depths,but the pore pressure of the shallow layer is lower.The distribution of the pore pressure ratio is small in the shallow layer and high in the middle and deep layers.（2）In terms of reducing the pore pressure,the multi-pile（gravel pile＋cement,fly-ash gravel（CFG）pile）composite foundation and the gravel pile,both have little effect on the pore pressure of the shallow and middle layers,but the gravel pile has better effects on the deep layer.（3）In terms of reducing vertical deformation,multi-pile（gravel pile＋ CFG pile）and CFG pile are more effective than the gravel pile,but the multi-pile foundation offers the most pronounced effect.