Offshore wind power construction is currently experiencing rapid growth worldwide, with China leading in the number of offshore wind turbines. Approximately 60 % to 70 % of these turbines are situated in the offshore area of the South Yellow Sea, Jiangsu Province. Despite its frequent exposure to waves and earthquakes, this region lacks comprehensive studies on the dynamic characteristics of local marine soils, which hinders the development of marine engineering design. This study addresses this gap by conducting a series of tests on marine silty sand using a combination of resonant column and dynamic triaxial tests. The investigation examined various dynamic parameters at both small and large strain scales, taking into account the soil ' s relative density, dynamic loading frequency, and cyclic stress ratio (CSR). The experimental results revealed that the attenuation of dynamic shear modulus aligns well with the classic H -D model. Moreover, the damping ratio exhibited an increase with cyclic loading until reaching a peak value at dynamic shear strains between 0.5 % and 0.8 %, followed by a rapid decrease due to liquefaction. Additionally, the failure behavior of the marine silty sand was found to be more sensitive to relative density than dynamic loading frequency under undrained shearing condition. The critical CSR for soil with a relative density of 73 % was approximately 0.18. Whereas for soil with a relative density of 53 %, it was about 0.12. The experimental findings provide valuable insights and parameters for the design of offshore engineering in this area.

来源平台：APPLIED OCEAN RESEARCH