大沙河倒虹吸工程地基为软基，采用振冲法处理，完成碎石桩3842根，总进尺19344．7m，置换碎石24845．2m3，淤泥质粉土采用正三角形布孔，砂土段采用矩形布孔，振后复合地基承载力标准值均大于设计值210kPa，抗液化能力明显提高，经2年的观测表明加固效果良好，达到预想目的． Dashahe inverted siphon project foundation for the soft foundation, the use of vibration method to deal with the completion of the 3842 gravel pile, the total footage 19344.7m, replacement gravel 24845.2m3, silt silt is the use of regular triangular holes, sand section The standard values ​​of bearing capacity of rectangular bored and vibrated composite foundation are both greater than the designed value of 210kPa, and the anti-liquefaction ability is obviously improved. After 2 years of observation, the reinforcement effect is satisfactory and the expected result is reached.