Abstract:  CFG piles, also known as cement fly-ash gravel piles, are made of cement, fly ash and gravel in proportion. Using fly ash, an industrial waste, as the main material to reinforce soft soil foundation not only meets the policy requirements of energy conservation and emission reduction in China, but also has good performance. It has been widely used for treating soft soil base. The project in this paper involves 6 heavy oil storage tanks with a capacity of 20,000 m³ each. CFG piles are used to reinforce the foundation soil, and the project has been operated for many years.

Key words: cement fly-ash gravel, composite foundation, storage tank, ring wall foundation