桩–网复合地基与桩承式路堤的对比数值模拟

Numerical simulation and comparison of pile-net composite foundation with pile-supported embankment

刚性桩加固软土地基常采用桩体+格栅以及桩+桩帽两种不同的处理形式,前一种处理方式是一种桩–网复合地基的处理形式,后一种一般称为桩承式路堤。两种形式在变形特性以及桩体受力特性上有其不同的特点。由于缺乏有效的对比研究,在处理方式的选取上存在一定的困难。鉴于现场试验手段的局限性,在现场对比试验的基础上对两种处理方式进行了三维流固耦合模拟和对比分析工作,揭示了不同处理方式桩顶平面沉降变形的特性,同时对桩体的应力进行了对比研究。

Pile-net （geogrid） and pile cap methods are always adopted in soft ground treated with rigid piles. The former is a method of composite foundation, while the latter is a kind of pile-supported embankment. And the deformation and stress characteristics of the piles in these two kinds of project are different. It is difficult to choose from the two methods for lacking of efficient comparative analysis. Due to the limitation of the methods of-in-situ experiments, numerical simulation of 3D fluid-mechanical interaction and analysis of the two treatments were done. The deformation characteristics on the plane of pile top were obtained and a contrastive study was done on the stresses of the piles.