基于实测的海上风电基础局部冲刷及防护措施效果对比研究

COMPARATIVE STUDY ON EFFECT OF LOCAL SCOUR AND PROTECTIVE MEASURES OF OFFSHORE WIND POWER FOUNDATION BASED ON FIELD MEASUREMENT

海上风电单桩基础局部冲刷普遍存在,且极限冲刷深度是开展基础结构设计的重要参数。因此,针对海上风电单桩基础,基于江苏某海上风电场的冲刷实测数据,研究韩海骞公式、王汝凯公式、Qi&Gao公式冲刷计算值与实测值之间的关系;分析对比抛石、固化土及砂被3种冲刷防护措施的防护效果。结果表明:3种计算方法可较为准确预测单桩基础的局部冲刷深度;固化土、砂被、抛石对冲刷防护的效果呈递减趋势。

Local scour of offshore wind farm foundation is a common natural phenomenon,which has an important impact on the safety of supporting structures.The ultimate scour depth of foundation without protection is an important parameter for foundation structure design.The comparison of protection effects of different erosion protection measures is the key factor for the selection of erosion protection measures.In this paper,the relationship between the measured value of brush depth and the calculated value of Qi&Gao formula,Han Haiqian formula and Wang Rukai formula is analyzed based on the measured scour data of an offshore wind farm in Jiangsu Province.At the same time,the protection effects of riprap,solidified soil and sand cover are measured and compared.The results show that the three calculation methods can predict the local scour depth of single pile foundation to a certain extent,and the protection effect of solidified soil,sand blanket and riprap decreases in turn.The relevant research results can provide reference for the design and operation and maintenance management of offshore wind power foundation projects.