Causes and processing methods for quality defects of CFG piles at high compressibility soft soil site

Abstract

The CFG pile has many advantages, such as small settlement, simple construction. So it has been widely used as the common foundation treatment in China. However, it has been carefully used in soft soil site because of quality defects of CFG piles. Based on a highway project case of soft site treatment using CFG piles in Fujian province, the reason of the pile integrity problems is analysed, and several solving methods are proposed. The studies show that long spiral drilling technology should be better than the sinking pipe method and geobag combined with sinking pipe method in the construction process of the CFG pile in soft soil site. The research results have significant reference to the application of CFG piles in soft soil site.