Loading mode.

This study proposes an innovative Vertical-Inclined Pile Foundation to optimize the bearing performance of onshore wind turbine foundations. The Vertical-Inclined Pile Foundation (VIPF) and Vertical Pile Foundation (VPF) mechanical response mechanisms under wind turbine loading are compared based on the Hardening Soil (HS) model. Investigating the displacement distribution patterns, bearing platform deformations, pile internal force transfer, and pile-soil interaction laws of both foundation systems reveals the efficiency improvement mechanism of the VIPF. The results demonstrate that under identical loading conditions, the maximum displacement of the VIPF (20.63 mm) is 23.8% lower than that of the VPF (27.06 mm). The outer ring of inclined piles in the VIPF significantly enhances structural stiffness through spatial synergy, achieving uniform load distribution and effective redistribution of pile-body internal forces. Damage mode analysis indicates that the bearing platform primarily undergoes local tensile and compressive damage at the foundation ring-pile body connection, while the inclined piles establish an active pile-soil interaction system by strengthening soil confinement effects. Furthermore, parametric studies reveal that the pile base displacement exhibits a non-linear trend of initially decreasing and then increasing with larger inclination angles of the inclined piles. These findings provide a novel structural solution and theoretical basis for onshore wind turbine foundation engineering.

本研究提出一种创新的竖斜组合桩基础（Vertical-Inclined Pile Foundation, VIPF），以优化陆上风力发电机组基础的承载性能。基于硬化土（Hardening Soil, HS）模型，本研究对比了竖斜组合桩基础（VIPF）与直桩基础（Vertical Pile Foundation, VPF）在风力发电机组荷载作用下的力学响应机制。通过分析两种基础体系的位移分布规律、承台变形、桩身内力传递规律与桩土相互作用规律，揭示了VIPF的效能提升机理。研究结果表明，在相同荷载工况下，VIPF的最大位移（20.63 mm）较VPF（27.06 mm）降低了23.8%。VIPF中的斜桩外环通过空间协同作用显著提升结构整体刚度，实现荷载均匀分布与桩身内力的有效重分配。损伤模式分析显示，承台主要在基础环与桩身的连接处发生局部拉压损伤；而斜桩通过强化土体约束效应，构建了主动桩土相互作用体系。此外，参数化研究表明，随着斜桩倾角增大，桩底位移呈现先减小后增大的非线性变化趋势。上述研究成果为陆上风力发电机组基础工程提供了新型结构解决方案与理论依据。