Abstract: Stratified compaction is often used as a reinforcement method for riverbeds and river beaches in sandy and gravel geological conditions.However, when rainfall causes overflow in riverbeds and river beaches and the groundwater level rises, the areas below the water surface do not meet the conditions for stratified compaction operations.To solve the problem of reinforcing underwater gravel and rock foundations, relying on the emergency rescue project of the B underground channel of the A water conveyance project, a construction method of vibration-driven compaction piles in gravel and rock foundations was proposed, and on-site tests of the bearing capacity of single-pile composite foundations of vibration-driven compaction piles were carried out.The results show that when heavy-duty dynamic contact testing is used to test the compactness of the foundation pile body and the soil between the piles after vibration compaction pile reinforcement, the average number of hammer strikes penetrating 10 cm at the pile body part is more than 15, and the average number of hammer strikes penetrating 10 cm at the soil test point between the piles is more than 7 to 10.The Q-s curves of the single-pile composite foundation of vibratory compaction piles are all slowly varying curves.When the vertical pressure reaches 600 kPa, the corresponding settlement is less than 0.1 times the pile diameter and has not reached the ultimate failure.The characteristic bearing capacity value of the single-pile composite foundation of vibratory compaction piles can reach 300 kPa.The vibration compaction pile composite foundation can meet the design and specification requirements, and the research results can provide a reference for similar foundation reinforcement work.