尺寸效应下单桩水平受荷特性数值研究

At present, steel pipe monopile foundation is widely used in offshore wind power. As the diameter of the monopile increases, the horizontal load response of the monopile shows a significant diameter effect. However, there is relatively little research on the horizontal load characteristics of monopile under diameter effect, especially the horizontal bearing contribution corresponding to soil resistance. In this paper, various numerical models of monopile with different pile-soil relative stiffness were established by ABAQUS and then validated by several centrifuge experiments. Subsequently, combined with the displacement field of soil around the pile under diameter effect, the contribution values of different soil resistance to the horizontal load bearing of monopile were evaluated, and the spatial distribution law of horizontal soil resistance was revealed. The results show that in the process of resisting horizontal loads, the horizontal soil resistance provides the highest bearing contribution, followed by the external friction resistance, and the base resistance and the inner friction resistance contribute the least. As the response of pile body gradually becomes rigid, the contribution of side friction resistance and base resistance will increase, and both shallow soil and deep soil of pile body will be fully mobilized to provide significant resistance moment. The research results can provide some reference for the design and optimization of horizontal load monopile.