海上挤密砂桩加固风电基础原位载荷试验分析

Analysis of In-Situ Load Test of Wind Power Foundation Reinforced by Compaction of Offshore Sand Piles

在覆盖层十几米内的海床地基上通过水下挤密砂桩加固采用重力式基础结构,在控制风机垂直度和经济性方面具有独特的优势。本文介绍了锚桩反力法对水深较大、荷载较大和传力杆较长,且处于外海海域的海上风电复合地基进行原位载荷试验的方案要点及应对措施,主要通过改善传力杆顶部与底部的约束条件、并增加水平限位构件约束后可使试验过程中传力杆的稳定性满足要求,为外海海域复合地基原位载荷试验积累了宝贵的经验。

Subject to gravity foundation built on the seabed within the range of over ten meters thick overburden stratum,and reinforced by the compaction of underwater sand piles,a turbine remain vertical and economical.The key points and countermeasures of in-situ load test based on anchor pile reaction method are introduced,which applies to offshore wind power composite foundation characterized with deep water,large load and long dowel bar.During the testing,the stability of dowel bar can meet the requirements by improving constraint conditions on the top and at the bottom of dowel bar and adding horizontal limit members,which will provide valuable experience for in-situ load test of composite foundation in open sea.