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1972年,交通部第四铁路工程局试验采用射水砂井法加固路堤软土地基获得成功。几年来,用这种方法加固了两处软土路基和一座桥梁基础的软土地基,共做了七百根深度不同的砂井。这种方法的主要原理:是用高速喷射的水束,将土壤冲成一定孔和深度的井孔,灌砂而成砂井。已施工的井孔孔径为0.25～0.3米,孔深达18米,射水砂井法使用的主要设备包括:
In 1972, the Fourth Railway Engineering Bureau of the Ministry of Transportation piloted the use of the water-jet sand method to reinforce the soft ground of the embankment. In recent years, two soft soil foundations and a bridge foundation soft soil foundation have been reinforced by this method, and a total of 700 sand wells of different depths have been built. The main principle of this method is to use a high-speed jet of water to flush the soil into a well of a certain hole and depth, filling sand into a sand well. The constructed well bore has a diameter of 0.25-0.3 m and a hole depth of 18 m. The major equipment used in the water jet sand well method includes: