泥沙研究2025，Vol.50Issue(4)：45-51,7.DOI:10.16239/j.cnki.0468-155x.2025.04.007
黏性底床后挖沟射流埋管试验研究
Experimental study on jet post-trenching and pipe embedment with viscous bed
摘要
Abstract
In order to explore the influence of moving jet on trenching morphology in clay bottom and to improve the backfill efficiency of submarine pipelines,a multi-nozzle jet device was designed and a physical model test of moving jet for trenching in viscous bottom has been carried out.The influence of nozzle moving speed,nozzle jet angle and undrained shear strength of the seabed materials on trenching effect are studied,and the trench morphology in viscous bottom is discussed and analyzed.The single-nozzle jet test result shows that the optimal trenching effect is achieved when the nozzle is deflected 5° towards the direction of jet movement.The four-nozzle jet test results show that with the increasing of jet moving speed,the trench depth decreases,the increasing trend of scouring capacity is slowing down from fast to slow,and the scouring specific energy decreases and tended to be stable,the optimal jet moving speed in the test is 10 mm/s;with the undrained shear strength of clay increasing,the trench depth decreases;the backfill efficiency in the jet buried pipe test can reach 65％,which indicating that the device can greatly shorten the backfill time.The research results have guiding significance for the optimization design and construction operation of trenching machines.关键词
射流挖沟/黏性土/后挖沟/海底管道埋设Key words
jet trenching/cohesive soil/post-trenching/submarine pipeline embedment分类
建筑与水利引用本文复制引用
孙智霖,马吉光,赵林,邹星..黏性底床后挖沟射流埋管试验研究[J].泥沙研究,2025,50(4):45-51,7.基金项目
国家自然科学基金项目(52088102) （52088102）
