Experimental Research on Liquefied Sand by Compaction Piles with Equal Energy and Equal Deformation in High Intensity Seismic Region

Seismic precautionary intensity of start zone of Jiangdong New Area in Haikou is 8, and design basic acceleration of ground motion is 0.30g, which is a high intensity seismic region. Quaternary Holocene saturated liquefied sand layer is widely distributed in the zone, and the liquefaction grade of soil is mostly classified serious. According to the overall plan of Jiangdong New Area, the area is mainly built with medium and high-rise large-span office buildings, with large structural load. Reducing or eliminating sand liquefaction is a difficult problem for the engineering construction in this zone. The effect of compaction piles with equal energy and equal deformation to strengthen liquefied sand is remarkable. When the vertical reinforcement uses recycled aggregate, its economic benefits are very obvious. According to the topic “Compaction Piles with Equal energy and equal deformation Composite Foundation Treatment of Recycled Aggregate”, 3 test areas are selected in the start zone of Jiangdong New Area, the test scheme is drawn up, the construction technical parameters of compaction piles with equal energy and equal deformation composite foundation are discussed, and the liquefaction evaluation parameters in this zone are studied. Through standard penetration test and heavy dynamic penetration test, the reinforcement effect before and after foundation treatment is compared and analyzed. The results show that this treatment method can improve the compactness of soil and effectively eliminate liquefaction. This work can be used for reference in geotechnical investigation, foundation engineering and ground treatment engineering in start zone of Jiangdong New Area.