海上风电单桩部分胶结抛石体防冲刷措施模型试验研究

MODEL INVESTIGATION OF OFFSHORE WIND POWER MONOPILE SCOUR PROTECTION MEASURES BASED ON PARTIALLY CEMENTED RIPRAP UNDERWATER

基于水下自护砂浆自流可控灌浆技术,利用高性能砂浆将单桩基础周围抛石胶结固化成胶结抛石体防护结构,并通过模型比尺为1∶13的大型波流水槽冲刷试验,研究桩周胶结抛石体防护结构在极端波流条件下的防护效果。试验结果表明,在重现期50和100 a极端波流条件下,水下部分胶结抛石体防护结构均能保持整体稳定,并有效减少单桩周围冲刷,桩周最大冲刷分别深度减少了82%和81%,冲刷范围减少了70%和80%。试验结果证明了部分胶结抛石体防护结构对海上风电单桩基础的稳定性起到良好的防冲刷保护作用。

Based on self-flow controllable grouting technology of underwater self-protecting mortar,use high-performance mortar to cement and solidify the riprap around the monopile foundation into an underwater cemented riprap protective structure.Through the scour test of a large wave current flume(model scale 1∶13),the protective effect of underwater partially cemented rockfill protective structure under extreme wave and current conditions are researched.The test results shows that under the extreme wave with retuen period of 50 and 100 a,the underwater protective structure of partially cemented riprap can maintain overall stability.It can effectively reduce the scour around monopile.The maximum scour depth and scour range around a pile can be reduced by 82%and 81%,respectively,the scour range can be reduced by 70%and 80%.The test results prove that the partially cemented riprap protective structure has a good anti-scouring protection effect on the stability of the offshore wind power monopile foundation.