High-strength cement soil piles;  composite foundations;  Relative stiffness

Cement-soil pile composite foundation is a widely used form of foundation treatment in China, and its main construction methods are deep mixing method (deep mixing method including slurry and powder deep mixing method), high-pressure jet grouting method (also known as high-pressure rotary spray method) and ramming filling method. Among them, the deep mixing method and high-pressure rotary spray method are commonly used methods in China, and the relative stiffness and calculation method of high-strength cement-soil pile composite foundation are analyzed through engineering case research, which has certain reference value for similar projects.