海上漂浮风电吸力桶型基础的抗拔承载特性  

Pullout Bearing Characteristics of Bucket Foundation for Floating Offshore Wind Turbine

作　　者：徐进 丁显 汤海宁 XU Jin;DING Xian;TANG Haining(China Green Development Investment Group Co.,Ltd,Bejing 100020,China;Duchengweiye Group Co.,Ltd,Bejing 100032,China;State Grid NARI-TECH Control Systems Ltd.,Nanjing 211106,China)

机构地区：[1]中国绿发投资集团有限公司,北京100020 [2]都城伟业集团有限公司,北京100032 [3]国电南瑞南京控制系统有限公司,南京211106

出　　处：《船舶工程》2022年第7期162-170,共9页Ship Engineering

摘　　要：文章开展数值模拟,研究漂浮式海上风机吸力式桶形基础在上层黏性土、下层砂土的分层土地基中的抗拔承载特性,探讨该基础的极限承载力、基础周围土体变形、基础转动点和前后侧土压力随加载位置和加载角度的变化规律。研究表明:随着加载位置沿主桶埋深方向下移,基础的抗拔承载力先增大后减小;当基础在分层土中承受倾斜荷载作用时,最佳加载位置位于3L/4桶高处(L为基础高度);基础的极限承载力和前侧土体变形范围均与加载角度成反比;对于桶顶中心受载的工况,加载角度对转动点的影响较小,在不同的加载角度下,基础的转动点均位于基础顶面以下0.84L处。此外,探究加载位置和角度对基础侧壁土压力的影响,结果表明:基础埋深3L/4以下的前侧地基土压力随荷载作用点的下移而增大,与荷载作用角度成反比;基础埋深3L/4下的前侧地基对基础承载性能的发挥有重要影响。Numerical simulation is carried out to study the uplift bearing characteristics of floating offshore fan suction bucket foundation in layered soil foundation with upper clay and lower sand.The variation rules of the ultimate bearing capacity,the deformation of soil around the foundation,the foundation rotation point and the front and rear lateral earth pressure of the foundation with the loading position and loading angle are discussed.The results show that the ultimate bearing capacity of bucket foundation shows a trend of increasing first and then decreasing with the increase of the depth of loading point.In the layered soil,the optimal loading point of bucket foundation under inclined load should be at the caisson 3L/4 position,and the loading angel is inversely proportional to the ultimate bearing capacity of bucket foundation.With the increase of loading angle,the soil deformation range gradually decreased.When the loading point locates at the center of caisson lid,the loading angel has little effect on the rotation center position of caisson.The rotation center lies in approximately 0.84L under various loading angels.Furthermore,the influences of loading point and loading angel on the earth pressure are investigated.The earth pressure embedded below 3L/4 in the loading direction increases with the increase of the depth of loading point,and is inversely proportional to the loading angle.The front side foundation under the foundation depth of 3L/4 has an important influence on the bearing performance of the foundation.

关 键 词：漂浮式海上风电 吸力式桶形基础 数值模拟 抗拔承载力 土体变形 土压力 

分 类 号：TU476[建筑科学—结构工程]