有压管道内的泥沙冲淤特性  

Erosion and Deposition Characteristics of Sediment in Pressure Pipe

作　　者：王永宁 祁贵贤 李正琪 梁俞 宋静 白妍丽 杜立鹏 李伟 南军虎[3] WANG Yong-ning;QI Gui-xian;LI Zheng-qi;LIANG Yu;SONG Jing;BAI Yan-li;DU Li-peng;LI Wei;NAN Jun-hu(Yanhuanding Yanghuang Extended Construction Project Administration Bureau of Qingyang,Qingyang 745000,China;Gansu Water Resources and Hydropower Survey and Design Research Institute Co.,Ltd.,Lanzhou 730000,China;College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]庆阳市盐环定扬黄续建工程建设管理局,甘肃庆阳745000 [2]甘肃省水利水电勘测设计研究院有限责任公司,甘肃兰州730000 [3]兰州理工大学能源与动力工程学院,甘肃兰州730050

出　　处：《水电能源科学》2024年第8期70-73,共4页Water Resources and Power

基　　金：国家自然科学基金项目(52069011);兰州市青年科技人才创新项目(2023-QN-33)。

摘　　要：为明确复杂地形条件下有压管道内泥沙的运动特征与临界不淤流速,采用模型试验研究了不同粒径泥沙在不同运动状态下的水流流速,分析了泥沙粒径、加沙量与泥沙级配对临界不淤流速的影响。结果表明,间歇式运动状态下,粒径介于(0.075~0.600)mm的泥沙在管道上升段与水平段呈多个椭圆状运动,较陡的下降段呈带状分布,粒径介于(0.600~1.250)mm的泥沙在管道内呈山丘状运动;泥沙运动状态的临界水流速度随泥沙粒径的增大呈增加趋势,且连续式推移状态为最佳泥沙输送状态;临界不淤流速均随泥沙粒径、加沙量、泥沙级配的增大而增大,泥沙粒径是影响临界不淤流速的主要因素,加沙量与泥沙级配是影响临界不淤流速的次要因素。研究结果可为复杂地形条件下有压引水管道工程的设计和应用提供参考。In order to clarify the movement characteristics and critical non-depositing velocity of sediment in pressure pipe under complex topographic conditions,the velocity of different grain sizes of sediment under different motion states was investigated by model test.The effects of different sediment grain sizes,sand volume and sediment grade on the cal criti-non-silt flow rate were analyzed.Meanwhile,discontinuous movement as bedload,sediment with particle size between(0.075-0.600)mm moves in multiple elliptical shapes in the rising and horizontal sections of the pipe,steeper descents are banded.Sediment with particle size between(0.600-1.250)mm moves in the form of a hill in the pipe.The critical velocity of water in the state of sediment movement tends to increase with the increase of sediment grain size,and uous contin-movement as bedload is the best sediment conveying state.The critical non-depositing velocity all increase with crease in-of sediment grain size,sand volume,and sediment grading.The sediment grain size is the main factor influencing the critical non-depositing velocity,and the amount of sand and sediment gradation are secondary factors that affect the critical non-depositing flow rate.The results can provide reference for the design and application of the pressure pipe in water diversion engineering in complex topographic conditions.

关 键 词：有压管道 泥沙运动形态 泥沙运动状态流速界定 临界不淤流速 

分 类 号：TV146[水利工程—水力学及河流动力学]