Introduction  Under the guidance of energy policy with the goal of "double carbon", offshore wind power generation, as a new energy technology, has been widely applied and rapidly developed in China. Monopile foundation is the most economical and widely used foundation in offshore wind power. In order to solve the problem of deformation and erosion protection of monopile foundation, a foundation reinforcement technology is proposed, and the reinforcement technology is studied and analyzed, and the basis of reinforcement method is given.

  Method  Researched and demonstrated the method of pile foundation reinforcement technology, selected a foundation reinforcement technology suitable for offshore construction through research on the technology roadmap and process of reinforcement, and used numerical analysis method to conduct a detailed analysis of the reinforcement effect and reinforcement influence range.

  Result  The results show that under 1.15 times of load, the horizontal bearing capacity of monopile foundation strengthened by foundation can be increased by more than 15%, and it can be applied to larger capacity models through foundation reinforcement. In this analysis case, when the depth and horizontal range of foundation reinforcement reach 8 m, the benefits obtained from the soil in the direction of reinforcement depth are greater than those in the direction of reinforcement plane.

  Conclusion  The technical scheme of using cement soil reinforcement has been verified to be reliable through numerical analysis, significantly improving the bearing capacity of monopile, and the reinforcement range is reasonable and economical. It can provide reference for the application of monopile foundation reinforcement technology in subsequent offshore wind power engineering.