Lateral dynamic response of partially embedded piles in the sea considering wave loads and wave-induced seabed dynamic response load distribution effects

High-intensity wave loads in marine environments cause stress changes in the soil around the pile, thereby affecting the bearing capacity of the embedded portion of the single pile. To investigate the impact of wave loads and Wave-Induced Seabed Dynamic Response (WISDR) on the lateral impedance of single piles, this study calculates wave loads on the non-embedded pile section using diffraction wave theory and analyzes seabed dynamic response based on porous elastic soil theory to derive horizontal loads from WISDR. Novak's plane strain theory and the Euler beam model are then applied to simulate the pile-soil system. This approach offers an analytical solution for calculating the lateral impedance of a single pile, fully accounting for WISDR. The validity of this method is confirmed by comparing it with previous experimental results. Finally, a parametric analysis is conducted to explore the effects of soil, pile, and wave parameters on the lateral impedance of the single pile. The results indicate that neglecting the impact of WISDR on the impedance of a single pile can lead to erroneous estimations within specific frequency ranges, while its influence becomes negligible outside this range.