强夯+CFG桩复合地基在具有腐蚀性的湿陷性黄土地区的应用

Application of dynamic compaction and CFG pile composite foundation in corrosive collapsible loess regions

CFG桩作为复合地基的一种,因其显著的优越性,在高层建筑中被大量使用,若用于湿陷性黄土地区,应先对湿陷性进行处理。强夯法在处理湿陷性黄土时,具有施工速度快、造价低廉、处理效果好等优点。以具体工程为例,对强夯+CFG桩复合地基在具有腐蚀性的湿陷性黄土地区的应用做了介绍,对强夯法的适用性、强夯设计步骤、施工注意事项、湿陷处理效果、CFG桩复合地基的设计方法等方面进行了详细阐述。工程实践表明,在具有腐蚀性的湿陷性黄土场地使用该方法进行地基处理可行,承载力及沉降均可满足规范要求,效果良好。

As a kind of composite foundation, CFG piles are widely used in high-rise buildings due to their remarkable advantages. If it was used in collapsible loess regions, the collapsibility should be treated first. The dynamic compaction method has advantages of fast construction speed, low cost and good treatment effect when dealing with collapsible loess. Taking specific project as an example, the application of dynamic compaction and CFG piles composite foundation in corrosive collapsible loess regions was introduced. The applicability of dynamic compaction, dynamic compaction design steps, construction precautions, collapsibility treatment effects and the design method of CFG pile composite foundation were elaborated in detail. The engineering practice shows that it is feasible to use this method for foundation treatment in corrosive collapsible loess regions, and the bearing capacity and settlement can meet the requirements of the specification, and the effect shows well.