Introduction  Under the wave-current combinations during the service period of offshore wind turbine, local scour inevitably occurs around pile foundation, which threatens the overall stability and safety of offshore wind turbine.

  Method  In this paper, the normal physical model test at a scale of 1∶30 was carried out for the wind power foundation with a diameter of 8.0 m to study the scour depth, sand cover, solidified soil protection range, and protection effect.

  Result  The results show that due to the good hydrodynamic conditions considered in this test, the maximum scour depth is 0.133 cm. In this case, the 1 cm-thick sand cover with a splicing size of 1.0 m×1.0 m can meet the stability requirements. When solidified soil is adopted for protection, the protection range shall not be less than 5 times the pile diameter, and block stones shall be laid at the edge of solidified soil to avoid scouring at the lower part of solidified soil.

  Conclusion  The test results can provide reference for scouring test and engineering design of similar projects.