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扩顶CFG桩复合地基是在常规CFG桩复合地基基础上发展起来的一种新的地基处理形式,利用了扩顶的荷载收集效应,充分发挥桩体高承载力的优势及桩间土的承载和变形协调能力。本文简要介绍了扩顶CFG桩复合地基的作用机理及油罐地基处理的要求和特点。针对江苏某大型油罐基底为淤泥质软土的特殊情况,采用“山皮石桩+CFG桩+桩帽+加筋垫层”的复合形式,桩帽和加筋垫层的共同作用,充分发挥桩体高承载力的优势,创造性的将山皮石桩+扩顶CFG桩的多桩型复合地基处理方式应用于大型油罐地基处理中,为大型油罐软土地基处理提供了一种新的思路。
Expanded CFG pile composite foundation is a new form of foundation treatment developed on the basis of conventional CFG pile composite foundation. It takes advantage of the load collection effect of expanding roof, gives full play to the advantages of high bearing capacity of pile and the bearing capacity of soil between piles Deformation coordination. This paper briefly introduces the mechanism of CFG pile composite foundation and the requirements and characteristics of foundation treatment. In view of the special case of a large oil tank basement in Jiangsu Province that is silt soft soil, the composite form of “mountain skin stone pile + CFG pile + pile cap + reinforced cushion” and the interaction between pile cap and reinforced cushion , Give full play to the advantages of high bearing capacity of piles, and creatively apply the multi-pile composite foundation treatment method of shale stone pile + CFG pile expansion to large-scale oil foundation treatment, providing a Kind of new ideas.