开孔护圈对海上风力机单桩基础的冲刷防护试验  

EXPERIMENTAL STUDY OF LOCAL SCOUR AROUND MONOPILE FOUNDATION OF OFFSHORE WIND TURBINE UNDER PROTECTION OF PERFORATED COLLAR

作　　者：俞月林 张国峰 王忠岱 谢立全[1] 李慧淑 Yu Yuelin;Zhang Guofeng;Wang Zhongdai;Xie Liquan;Li Huishu(College of Civil Engineering,Tongji University,Shanghai 200092,China;Hebei Jiantou Offshore Wind Power Co.,Ltd.,Tangshan 063000,China;College of Transportation Engineering,Tongji University,Shanghai 201804,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]河北建投海上风电有限公司,唐山063000 [3]同济大学交通工程学院,上海201804

出　　处：《太阳能学报》2023年第6期420-426,共7页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金面上项目(51479137)。

摘　　要：基于圆形护圈调整桩基局部流场,护圈开孔进一步交换上下两侧水体,降低结构振动并减少桩基冲刷深度,从而维持风力机的正常运行。为验证开孔护圈的防护效果,开展不同开孔型式护圈防护下的单桩基础冲刷物理模型试验。通过设计9种不同型式的开孔护圈,探究护圈开孔形态、开孔数量和开孔位置对防护性能的影响。结果表明:护圈改变桩基边缘冲刷形态,护圈开孔可提高桩基前期冲刷速率;相比传统护圈,内侧开孔护圈和外侧开孔护圈防护效果较差,而中间开孔护圈可进一步减小单桩基础周围冲刷深度,并控制冲刷深度不均匀性,提升护圈防护效果。The local flow field around a pile foundation can be adjusted using a circular collar,which when perforated,facilitates the exchange of water between the upper and lower sides,thereby reducing structural vibrations and minimizing scour depth,ultimately maintaining the proper operation of wind turbines.To investigate the effectiveness of perforated collars as scour protection measures,physical model experiments were conducted on monopile foundation with various collar perforation patterns.Nine different collar perforation patterns were designed to explore the effects of perforation pattern,number,and location on the protection performance.The results indicate that the collar alters the scour pattern around the pile foundation,and collar perforation can increase the initial scour rate.Compared with traditional collars,collars perforated on the inner and outer sides exhibit lower protection effectiveness,while a perforated collar with perforations in the middle can further reduce the scour depth and control the unevenness of scour depth,thereby enhancing the protection performance.

关 键 词：海上风力机 桩基础 冲刷 水槽 开孔护圈 

分 类 号：TV135[水利工程—水力学及河流动力学]