河内-海防公路软基渗透性及差异沉降研究

考虑到地基竖向渗透系数改变的问题,提出了砂井地基平面化等效渗透系数计算方法,并运用Plaxis2D软件进行了对比分析,并与现场监测数据进行了对比验证,并系统分析了不同软基处理形式下软基过渡段的差异沉降变化规律。结果表明:在相同的路堤高差下,不同的过渡段处理方式产生的工后差异沉降顺序为:挤密砂桩处理普通砂井处理塑料排板处理,本工程采用的过渡段软基处理方案满足越南关于工后差异沉降控制标准。

Research on equivalent permeability and differential settlement about soft foundation treatment on Hanoi-Hai Phong expressway

Considering the variation of ground vertical permeability coefficient, the ground plane of sand equivalent permeability coefficient calculation method was presented. The field monitoring data were compared by using the Plaxis2D software. The variation form of settlement of soft base under the transition section of different soft foundation treatment were analyzed. At the same height of embankment the order of differential settlement after different treatment modalities in different transition section is as follow: sand compaction pile treatment, o rdinary sand processing and plastic drainage board, incrensingly. The results show that the transition section of soft foundation treatment scheme satisfies to the controlling criterion of differential settlements in Vietnam.