CFG桩处理软土路基沉降监测及FLAC3D模拟分析

Settlement Monitoring and FLAC 3D Simulation Analysis of Soft Soil Subgrade Treated with CFG Pile

为研究CFG桩对复合地基变形性能的影响,论文基于某一工程的典型工点的沉降监测数据进行分析,同时通过FLAC3D建立数值模型进行计算,对CFG桩加固路基的变形特性进行分析,所得结果如下:(1)路基的工后沉降量占总沉降量的比值随着路基填土高度的增加逐渐降低;(2)随着填土高度的增加,路基的总沉降量、整体水平位移和桩体位移均增大,总沉降量随着距路基中心的距离增大而减小;(3)CFG桩加固的路基沉降量远小于天然路基沉降量,且CFG桩加固的路基,其中心与路肩之间的差异沉降值也远小于天然路基,说明CFG桩加固路基对于减小软土路基的沉降量有着非常显著的效果。

In order to study the influence of CFG pile on the deformation performance of composite foundation, this paper analyzes the settlement monitoring data of a typical construction site of a project, establishes a numerical model through FLAC 3D for calculation, and analyzes the deformation characteristics of CFG pile reinforced subgrade. The results are as follows:(1) the ratio of post construction settlement of subgrade to total settlement decreases gradually with the increase of subgrade filling height;(2) With the increase of the filling height, the total settlement, overall horizontal displacement and pile displacement of the subgrade increase, and the total settlement decreases with the increase of the distance from the subgrade center.(3) The subgrade settlement strengthened by CFG pile is far less than that of natural subgrade, and the differential settlement between the center and shoulder of the subgrade strengthened by CFG pile is also far less than that of natural subgrade, indicating that the subgrade strengthened by CFG pile has a very significant effect on reducing the settlement of soft soil subgrade.