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引用本文:杨少林,金 瑾,马勇勇,等.低压浑水管道输沙规律研究及水流挟沙力计算[J].灌溉排水学报,2024,43(3):103-112.
YANG Shaolin,JIN Jin,MA Yongyong,et al.低压浑水管道输沙规律研究及水流挟沙力计算[J].灌溉排水学报,2024,43(3):103-112.
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低压浑水管道输沙规律研究及水流挟沙力计算
杨少林,金 瑾,马勇勇,兰文宇
1.石河子大学 水利建筑工程学院,新疆 石河子 832000; 2.寒旱区生态水利工程兵团重点实验室,新疆 石河子 832000
摘要:
【目的】确定输水工程适宜运行的水力条件。【方法】以巴音沟河流域输水工程为研究对象,通过数值模拟的方法研究不同泥沙质量浓度、压力条件下浑水管道输沙规律及水流挟沙力特性。【结果】①管道断面垂向泥沙质量浓度分布受压力、体积含沙量及管径等因素的影响;当压力及管径较小时,泥沙淤积厚度为6.3~8.0 mm,压力及管径较大时,在Y=-0.07区域以下淤积较多,淤积厚度达到8.6~9.4 mm;②同一管径及流速下,随着体积含沙量的增大,该区域流速梯度增大,最大增幅为14%;③随着水流速度增大,水流挟沙力增大,悬移质质量浓度也越大,但是悬浮指标逐渐变小。【结论】在低压浑水管道中,管径越大、泥沙质量浓度越大、压力越小,水流挟沙力越小,泥沙越容易淤积。
关键词:  管道输沙;数值模拟;垂向泥沙质量浓度分布;水流挟沙力;悬浮指标
DOI:10.13522/j.cnki.ggps.2023379
分类号:
基金项目:
Sediment transport and sediment carrying capacity in low-pressure pipeline systems for muddy water flow
YANG Shaolin, JIN Jin, MA Yongyong, LAN Wenyu
1. College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi 832000, China; 2. Key Laboratory of Cold and Arid Regions Eco-Hydraulic Engineering of Xinjiang Production & Construction Corps, Shihezi 832000, China
Abstract:
【Objective】Sediment deposition associated with muddy water flow in hydraulic projects is a significant concern, impacting not only longevity of the project but also its safe operation. This paper aims to explore the factors that influence sediment transport and sediment carrying capacity of water in low-pressure pipeline system for muddy water flow.【Method】The study is based on a water transportation project at Bayingou River Basin. Sediment transport and the associated sediment carrying capacity under different sediment concentrations and working pressures were studied using numerical simulations.【Result】The vertical concentration distribution of the sediment in the pipeline is affected by water pressure, volumetric sediment concentration and pipe diameter. When water pressure and pipe diameter are small, the sediment deposition thickness is in 6.3~8.0 mm. When water pressure and pipe diameter are increased, there is more sediment deposition below the Y=-0.07 area, and the sediment deposition thickness is in 8.6~9.4 mm. When the pipe diameter and water flow rate are the same, increasing sediment concentration increases the flow rate gradient, with the maximum increase being 14%. Increasing water velocity increases sediment carrying capacity of the water and the concentration of suspended load, but it reduces the suspension index gradually.【Conclusion】In low-pressure pipe network with muddy water flow, enlarging pipe diameter increases sediment concentration, whereas lowering water pressure reduces sediment carrying capacity, thereby resulting in sediment accumulation.
Key words:  pipeline sediment transport; numerical simulation; vertical sediment mass concentration distribution; sand carrying capacity of water flow; suspension index