Stokes波流作用下伞式吸力锚基础局部冲刷演变分析  

Evolution analysis of local scour of umbrella suction anchor foundation under Stokes wave and current

作　　者：赵真 胡瑞庚 刘红军[1,2] 冷浩 ZHAO Zhen;HU Ruigeng;LIU Hongjun;LENG Hao(Ocean University of China,Qingdao 266100,China;Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering,Qingdao,Shandong 266100,China;Sinopec Petroleum Engineering Corporation,Dongying,Shandong,257100,China;Tianjin Research Institute for Water Transport Engineering,Ministry of Transport of the People's Republic of China,Tianjin,China)

机构地区：[1]中国海洋大学环境科学与工程学院,山东青岛266100 [2]山东省海洋环境地质工程重点实验室,山东青岛266100 [3]中石化石油工程设计有限公司,山东东营257100 [4]交通运输部天津水运工程科学研究院,天津300456

出　　处：《海洋湖沼通报》2023年第4期6-15,共10页Transactions of Oceanology and Limnology

基　　金：国家自然科学基金资助项目(41572247)。

摘　　要：基于Flow-3D软件建立海床土-吸力锚-波浪相互作用模型,模拟分析了Stokes五阶波流作用下伞式吸力锚基础(USAF)在非粘性土中的局部冲刷特征。综合分析基础周围流场特征、湍流特征、冲刷时程曲线、冲刷图像和不同波高、水深条件对局部冲刷特征的影响等。模拟结果表明:冲刷影响范围主要集中在锚枝之间和基础后方区域,筒前筒侧马蹄形旋涡发育最为充分,筒后旋涡脱落,水体紊动剧烈。试验最大冲刷深度和淤积高度出现在筒后冲刷坑内和筒侧后方,分别为-2.247m和0.688m。锚枝的存在能够对土体起到较好的固定作用,波高H和水深h对局部冲刷有明显影响,随着波高的增加和水深的降低局部冲刷作用逐渐剧烈,冲刷坑深度逐渐增加,淤积范围后移,试验不同波高和不同水深下的最大冲刷深度相差分别为0.647m和0.714m。A wave-suction anchor-seabed interaction model was established by FLOW-3D.The local scour characteristics of umbrella suction anchor foundation in non-cohesive soil under the action of fifth order Stokes wave and current were simulated and analyzed.The characteristics of flow field around the anchor,turbulence characteristics,curve of scour depth with time,erosion image and the influence of different wave height and water depth on local scour were comprehensively analyzed.The results show that the scoured area was mainly concentrated between anchor branches and behind the anchor.The vortices developed best in front of and on the side of the cylinder,and then fell off at the back of the cylinder.The maximum scour depth and deposition height appeared in the scour pit behind the anchor,which were-2.247 m and 0.688 m respectively.The anchor branches can fix ambient soil around foundation.The wave height(H)and water depth(h)had obvious effects on local scour with the increase of wave height and the decrease of water depth,and the local scour became more severe.The depth of scour pit increased gradually,and the scope of deposition moved backward.The difference of maximum scour depth under different wave height and water depth was 0.647 m and 0.714 m respectively.

关 键 词：海上风机 STOKES波 吸力锚基础 局部冲刷 数值模拟 

分 类 号：TU473[建筑科学—结构工程]