Abstract: Liquefaction of saturated sand is a major problem in engineering. The large-diameter gravel piles with vibroflotation are used to control the liquefaction of large-thickness saturated sand of a proposed power plant project, and many field test studies are carried out. After finishing the construction of the test piles, a lot of in-situ tests including plate loading test, ultra-heavy dynamic penetration test, etc., are used to evaluate the bearing capacity of soil between piles, piles and composite foundation, to test the deformation parameters, and to evaluate the controlling effects of liquefaction. A large number of reliable experimental data are obtained, which are valuable for similar projects

Key words: saturated sand, liquefaction, gravel piles with vibroflotation, composite foundation;