溜桩对海上风电钢管桩单桩水平承载特性的影响研究

Influence of Sliding Pile on Horizontal Bearing Capacity of Single Pile of Offshore Wind Turbine Steel Pipe Pile

海上风电大型钢管桩重量大,在成桩过程中遇到软弱土层会出现溜桩现象,因此开展溜桩对钢管桩承载特性的研究具有重要意义。首先,采用理论分析确定溜桩区间,其次基于ABAQUS建立考虑溜桩效应的桩土数值模型,分析溜桩对钢管桩承载特性的影响规律。研究结果显示:(1)钢管桩在土层深度24~43 m发生溜桩,溜桩区间长度为19 m;(2)溜桩效应使钢管桩的水平极限承载力比无溜桩时降低13.46%;(3)溜桩效应使钢管桩受到水平荷载后产生更大的挠度,桩顶位移比无溜桩时增大12.4%。

Large-scale steel pipe piles for offshore wind power are heavy in weight, and slipping will occur when encountering weak soil layers during the pile formation process. Therefore, it is of great significance to carry out research on the bearing characteristics of steel pipe piles by slipping piles. Firstly, theoretical analysis is used to determine the pile-slide interval, and secondly, a pile-soil numerical model considering the effect of the pile-slide is established based on ABAQUS to analyze the influence of the pile-sliding pile on the bearing characteristics of steel pipe piles. The research results show that:(1) the steel pipe pile slipped at the soil depth of 24-43 m, and the length of the slipped pile interval was 19 m;(2) the sliding pile effect made the horizontal ultimate bearing capacity of the steel pipe pile more than without the slipped pile Decrease by 13.46%;(3) The sliding pile effect causes the steel pipe pile to produce greater deflection after being subjected to horizontal load, and the pile top displacement is increased by 12.4% compared with the case without sliding pile.