波流作用下海底管道周围局部冲刷和水动力特征研究  

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

作　　者：王起刚 冷浩 于雅琼 曹同钢 WANG Qigang;LENG Hao;YU Yaqiong;CAO Tonggang(Qingdao Geotechnical Investigation and Surveying Research Institute,Qingdao 266035,China;Ocean University of China,Qingdao 266100,China)

机构地区：[1]青岛市勘察测绘研究院崂山分院,山东青岛266035 [2]中国海洋大学环境科学与工程学院,山东青岛266100

出　　处：《海洋湖沼通报（中英文）》2024年第5期64-72,共9页Transactions of Oceanology and Limnology

基　　金：国家自然科学基金项目(41572247);中央高校基本科研业务费专项(202061027)。

摘　　要：通过室内水槽试验,研究了波浪和水流共同作用下管道周围局部冲刷过程。此外,采用Flow-3D数值模拟软件建立波流-管道-流体有限元模型,研究了海底管道在Stokes波和水流共同作用下的水动力和局部冲刷特征,探究了水深、流速、管道直径、悬空高度等因素对管道周围冲刷的影响规律。结果表明:波流作用下,管道上、下游两侧压力差引起管道下的渗流,在渗流力的作用下泥沙颗粒发生管涌,管道与海床之间形成孔道,标志着局部冲刷的开始。不同水深、管道悬空高度、海流流速对管道冲刷特征有显著影响,水深增加,最大冲刷深度减小,有效抑制了冲刷的发展;管道悬空高度增加,最大冲刷深度也随之减小,但冲刷坑的宽度相应增大;海流的存在显著促进了冲刷的发展,增加了管道的最大冲刷深度。The scour process around submarine pipeline in combined waves and current were experimentally investigated.Furthermore,the coupled waves and current-pipeline-fluid numerical model were built by the FLOW-3D software to study the scour and hydrodynamic characteristics around pipeline in combine waves and current.Based on the numerical results,the effects of water depth,pipeline diameter,pipeline suspended height on the scour depth were analyzed.The results indicated that the pressure difference between the upstream and downstream sides of the pipeline resulted in piping beneath pipeline,promoting the tunnel scour,which indicated the onset of scour.There were three vortex system around pipeline in waves,and it accelerated the scour.The scour depth was significantly influenced by the water depth,pipeline diameter,pipeline suspended height.A greater water depth and pipeline suspended height resulted in a smaller scour depth.The scour depth increased with the increase of current velocity.

关 键 词：海底管道 局部冲刷 冲刷机理 最大冲刷深度 水动力特性 

分 类 号：TU473[建筑科学—结构工程]