塑料套管混凝土桩加固公路软基沉降性状有限元分析

为了研究塑料套管混凝土桩（TC）桩加固公路软基的加固机理和变形特性,采用有限元方法分析了桩长、桩间距、填土高度对路基沉降的影响。TC桩未打穿软土层时,沉降较大,为减少沉降及工后沉降,TC桩宜打穿软土层进入相对持力层0.5-1.0m。TC桩桩端为相对硬土层时,调节桩间距,可以起到调节沉降的效果,但调节桩长更为明显,在满足稳定及有一定预压期时,适当加大桩间距对总沉降及工后沉降影响不大,设计时可适当放大桩间距,以降低工程造价。

Finite Element Analysis on Settlement of Highway Soft Foundation Reinforced by Plastic Tube Cast-in-place Concrete Pile

In order to study the consolidate mechanisms and deformation features of the soft highway substructure reinforced by plastic tube east-in-place concrete pile （TC pile）, the effects of pile length, the distance between piles, the filling height on substructure settlement through finite element method. It learned that when the TC pile didn＇t punch through the soft soil layer the settlement was big, to decrease the sedimentation and the post-construction settlements the TC pile should be punched through the soft soil layers and enter into the supporting layer about 0.5-1.0 meter. Adjusting the pile separation distance can regulate the post-construction settlement while the tip of the TC pile arrive at the relative hard pan, but it was more effective to adjust the pile length. When the substructure was steady and pre-loaded enlarging piles distances have little influence on the whole settlement and the post-construction settlements, so the distances between the piles can be enlarged properly to decrease the costs of engineering construction.