小浪底水库泥沙管道高效输送的合理参数分析

针对管路中沿程实时变化的含沙量和颗粒级配情况,借鉴以往的研究成果,从管路中泥沙的冲淤变化、悬浮特性等多角度分析确定了管道输送泥沙的临界不淤流速;并采用实测值与模型计算值对比拟合的方法,确定了用费祥俊的临界不淤流速计算模型来分析本次管道输送的临界不淤流速;最后,以理论与实践结合提出小浪底水库泥沙管道高效输送的管径和含沙量,为今后试验或生产实践提供参考依据。提出了管径为0.325m和0.63m两种不同工况的高效输送参数:含沙量均为620kg/m~3,中值粒径范围0.051 2~0.062 9mm,D90为0.14mm,输送流速分别可在1.75~2.08m/s和2.08~2.2m/s之间进行调节。对应最大月排沙量分别为8.95万t和34.72万t。

Rational parameter analysis of high-efficiency pipeline transport of sediment in Xiaolangdi Reservoir

Based on previous research results as well as the scour and deposition changes and suspension characteristics of sediment in the pipeline,we identified the non-depositing critical velocity of pipeline transport of sediment considering the real-time changes in sediment concentration and particle size distribution along the pipeline.We compared the measured values with the calculated values of different models,and chose Fei Xiangjun's model to calculate the non-depositing critical velocity of pipeline transport.Finally,on both theoretical and practical bases,we proposed the pipe diameter and sediment concentration for high-efficiency pipeline transport of sediment in Xiaolangdi Reservoir,which can be a reference for future testing or production practices.We proposed the high-efficiency transport parameters for two different diameters of 0.325 m and 0.63 m.The two conditions both had the following parameters:a sediment concentration of 620 kg/m3,a median particle size of 0.051 2~0.062 9 mm,and 0.14 mm D90.The transportation velocity can be adjusted between 1.75~2.08 m/s and 2.08~2.2 m/s.The corresponding largest sand discharge quantity per month was 89500 tons and 347200 tons.