The construction process of offshore wind farms in China is rapidly accelerating and seabed geological conditions vary significantly across different sea regions of China, which provides huge challenges for the construction of offshore wind farms. Foundation construction accounts for 30% of the total investment of offshore wind turbines (OWT), and ensuring the stability of pile-foundations is crucial for ensuring safe construction and normal safe operation of the OWT, which necessitates a comprehensive understanding of mechanical characteristics of seabed construction material under complex cyclic loadings. Therefore, this article focuses on studying the cyclic behavior of mucky clay (MC) and weathered granite residual soil (GRS) through serial cyclic triaxial tests. The stress-strain and stress path behaviors under various cyclic loads are analyzed for both types of submarine soils. Furthermore, the mechanical properties and load-bearing characteristics are thoroughly investigated by examining cumulative strain development, pore pressure behavior, and stiffness attenuation modes. More critical, a critical failure prediction model is established, for plotting the critical failure surface for both MC and weathered GRS, and the study reveals the cyclic failure modes of typical submarine soil under cyclic loading, which provides valuable insights for the design and construction of offshore wind farms.

来源平台：MARINE GEORESOURCES & GEOTECHNOLOGY