软土地区CFG桩复合地基静载试验及数值分析研究

Static Load Test and Numerical Analysis of Composite Foundation of CFG columns in Soft Soil Area

为研究软土地区CFG桩复合地基的加固效果,采用单桩现场试验和数值模拟研究了CFG桩复合地基的变形特点。从某软土地区的CFG桩复合地基中选取三根单桩进行静载试验,通过试验结果与数值模拟结果对比,验证了数值分析结果的有效性。利用FLAC3D有限差分计算程序,对一个20 m×20 m的区域进行数值建模,计算比较了含CFG桩和不含CFG桩复合地基的地表位移及应力分布。结果表明,相比不含CFG桩加固体的地基,含CFG桩复合地基的地表沉降和地基应力分布有明显区别,CFG桩通过分担了部分的应力,可以有效地加强软土地基,并减少地表沉降。

Both the static loading test ingle Cement-Fly-ash and Gravel(CFG)column and the numerical analysis of the composite foundations formed by the CFG columns are performed in order to evaluate the soil improvement results using CFG columns.Three CFG columns were statically loading tested and the results were used to calibrate the numerical analysis results.The calibrated parameters were used in the numerical analysis by using FLAC3D finite different analysis commercial software on an area of 20 by 20 meters.The numerical analysis simulated ground settlement of ground with and without CFG columns.The results indicated that both the settlement and the stress distributions in the composite ground with CFG columns are significantly different.The CFG columns share the portion of the stress and improve the soft soils.