挤密砂桩在近水软土地基加固中的应用

Application of Compacted Sand Pile in Reinforcement of Near-Water Soft Soil Foundation

针对软土地基承载力较低的特点,通过比选,采用挤密砂桩的方法进行加固,并对挤密砂桩的加固机理和施工工艺进行分析。使用FLAC软件对挤密砂桩加效果进行分析,对施工过程中孔隙水压力、桩土应力比、侧向位移、沉降量进行分析。结果表明,桩土沉降差与应力比是协同变化的,沉降差达到最大时应力比也达到最大;挤密砂桩具有较好的控制沉降和侧向变形的作用。

In view of the low bearing capacity of soft soil foundation, compacted sand piles are selected to reinforce it, and the reinforcement mechanism and construction technology of compacted sand piles are analyzed. FLAC software is used to analyze the effect of adding compacted sand piles, and the pore water pressure, pile-soil stress ratio, horizontal displacement and settlement during construction are analyzed. The results show that the pile-soil settlement difference and stress ratio are synergistic changes, and the stress ratio is maximum when the settlement difference reaches its maximum value;compacted sand piles have a better role in controlling settlement and lateral deformation.