透空导流板对海底管线冲刷防护的试验研究  

Experimental study on scour protection of submarine pipeline by permeable spoiler

作　　者：高枫 拾兵[1] 肖亚南 丛晓红 于西达 GAO Feng;SHI Bing;XIAO Yanan;CONG Xiaohong;YU Xida(College of engineering Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学工程学院,山东青岛266100

出　　处：《海洋湖沼通报》2023年第1期23-29,共7页Transactions of Oceanology and Limnology

基　　金：国家自然科学基金(51279189);联合基金(U1906234)。

摘　　要：基于海底管线周围流场复杂,管线运行过程中易于出现冲刷悬空破坏等诸多特征。本文根据导流板作用下海底管线的冲刷防护机理,提出了一种透空导流板与海底管线结合的防冲刷措施。通过量纲分析得到了影响海底管线冲刷深度的无量纲公式,并通过物理模型试验,研究了单向流作用时,不同流速、不同管孔比、不同透水比的工况下透空导流板对海底管线的冲刷防护的影响。研究发现,由于透空导流板的存在,泥沙受到的推移力减小,导致泥沙淤积,海底管线的冲坑深度小于无导流板防护的冲坑深度,透空导流板防护的管线最大冲刷深度在管轴线前0.3 D处,且在管线下方冲刷坑深度明显减小。基于试验资料分析,拟合得到了平衡冲刷深度的计算公式,其公式与实测资料拟合较好,说明该公式具有较好的适用性。Based on the complex flow field around a submarine pipeline,there are many characteristics such as scour and suspension failure in the process of operation.According to the scour protection mechanism of submarine pipeline under the action of spoiler,we put forward a scour prevention measure combining the permeable spoiler and submarine pipeline.The dimensionless formula that affects the scour depth of submarine pipeline is obtained by dimensional analysis.Through physical model test,the influence of the permeable spoiler on the scour protection of submarine pipeline is studied under the condition of different velocity,different pipe hole ratio and different water permeability ratio.It is found that due to the existence of the permeable spoiler,the pushing force of the sediment is reduced,resulting in sediment deposition.The scour depth of the submarine pipeline is less than that of the pipeline without the protection of the spoiler.The maximum scour depth of the pipeline with the protection of the permeable spoiler is 0.3D in front of the pipe axis,and the scour depth under the pipe line is significantly reduced.Based on the analysis of the test data,the calculation formula of the equilibrium scour depth is obtained by fitting.The formula fits well with the measured data,which shows that the formula has good applicability.

关 键 词：海底管线 透空导流板 冲刷 防护 试验研究 

分 类 号：TV148[水利工程—水力学及河流动力学]