淹没水射流破碎密实粉土试验研究  

Experimental study on crushing dense silt by submerged water jet

作　　者：孙守胜 刘峰 林森 陈浩 尹崧宇 SUN Shou-sheng;LIUFeng;LIN Sen;CHEN Hao;YIN Song-yU(CCCC Tianjin Dredging Co.,Ltd.,Tianjin 300461,China;Tianjin Key Laboratory for Dredging Engineering Enterprises,Tianjin 300457,China;Shanghai Zhenhua Heavy Industry Co.,Ltd.,Shanghai 200125,China)

机构地区：[1]中交天津航道局有限公司,天津300461 [2]天津市疏浚工程技术企业重点实验室,天津300457 [3]上海振华重工(集团)股份有限公司,上海200125

出　　处：《水运工程》2022年第S02期1-5,共5页Port & Waterway Engineering

摘　　要：耙头在挖掘密实粉土时,使用常规高压冲水来辅助破土的作用机理尚不明晰。为了解高压冲水破碎密实粉土的实际作用效果,采用现场试验和仿真分析的手段,对实验室制备的密实粉土开展常规压力高压冲水破土试验并进行理论分析。结果表明:高压冲水破土深度和宽度受喷嘴移动速度、靶距和直径影响较大,并呈现不同规律;挖掘密实粉土时,高压冲水虽然辅助破土作用不明显,但可以明显降低耙头挖掘阻力,应根据现场实际情况合理使用高压冲水。试验结论可为耙头设计和密实粉土施工工艺提供指导。When the draghead excavates dense silt,the mechanism of using conventional high-pressure flushing to assist soil breaking is not clear.To understand the actual effect of high-pressure flushing on crushing dense silt,the conventional high-pressure flushing soil breaking test and theoretical analysis are carried out on the dense silt prepared in the laboratory by means of field test and simulation analysis.The results show that the depth and width of soil breaking by high-pressure flushing are greatly affected by the moving speed of nozzle,target distance and diameter,and show different laws.When excavating dense silt,although the auxiliary breaking effect of high-pressure flushing is not obvious,it can reduce the excavation resistance of rake head significantly,high-pressure flushing should be used reasonably according to the actual situation of the site.The results of the test can provide guidance for the design of draghead and the construction technology of dense silt.

关 键 词：淹没水 密实粉土 高压冲水 射流 破碎 

分 类 号：U615.31[交通运输工程—船舶及航道工程] U616.21[交通运输工程—船舶与海洋工程]