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以垂直射流冲刷非黏性沙床试验为基础，对形成的稳定边坡管道沟槽进行单向及往复流作用下回填试验。构建多比尺物理模型，揭示回填泥沙输运形式、沟槽断面形态及总回填时间变化规律。结果显示：单向流的迎流前侧泥沙推移、后侧泥沙局部冲刷；回填速率逐渐增大后减小、沟槽断面出现明显坡降。往复流的沟槽两侧泥沙向中轴往复推移，回填速率先减小后增大、断面更为均匀平整。随着回填作用强度增大，单向流的总回填时间呈现线性降低，往复流的总回填时间呈现非线性(单指数型)降低。
Abstract：Based on the experiment of vertical jet scouring non-cohesive sandy beds, backfilling tests under unidirectional and reciprocating flow on the formed stable slope pipeline trench has been conducted. After a series of multi-scale physical modelling, the sediment transport mechanisms, trench cross-sectional morphology, and overall backfilling time variations are revealed. The results show that under unidirectional flow, sediment is pushed forward on the upstream side and partially eroded on the downstream side. The backfilling rate initially increases and then decreases, with a significant slope observed in the trench cross-section. Under reciprocating flow, sediment on both sides of the trench moves reciprocally toward the central axis, with the backfilling rate initially decreasing and then increasing, which resulting in a more uniform and level cross-section. A dimensionless backfilling intensity is introduced to express the variation of total backfilling time, which decreases linearly with its increase under unidirectional flow, and nonlinearly(exponentially) under reciprocating flow.
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基本信息:
DOI：10.16239/j.cnki.0468-155x.2025.03.009
中图分类号:TV149
引用信息:
[1]陈凌峰,闵乐乐,孙玉天,等.单向及往复流作用下管道沟槽回填试验研究[J].泥沙研究,2025,50(03):58-65.DOI:10.16239/j.cnki.0468-155x.2025.03.009.
基金信息:
上海勘测设计研究院有限公司项目资助(合同编号：2022QT(83)-069)
2025-05-08
2025-05-08
2025-05-08