Experimental And Numerical Study Of Slit-check Dams
Experimental And Numerical Study Of Slit-check Dams
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DOI：
10.2495/sdp-v11-n2-107-118
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发表时间：
2016-04
影响因子：
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通讯作者：
M. Silva;S. Costa;R. Canelas;A. Pinheiro;A. Cardoso
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文献类型：
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作者：
M. Silva;S. Costa;R. Canelas;A. Pinheiro;A. Cardoso
本文介绍并讨论了为评价窄缝坝（开口型拦河坝）作为陡槽泥石流短期结构减灾措施的有效性和适用性而进行的实验室试验和数值模拟结果。受常见的缝坝方案的启发，在实验研究中测试了两种不同的桥墩布置-对齐式和V形。文中给出了一些主要的排沙效果试验结果，表明顺排方案比V形方案更适合于石质泥石流的排沙。实际上，已经证明，裂缝坝的缓解效率受到各种变量和参数的影响，其中大多数以前被几位作者研究过，但也受到平面视图中的桥墩布置的影响。考虑到对齐布局，应考虑1.0d 95至1.4d 95的狭缝宽度，以设计有效的狭缝坝解决方案。此外，进行了数值研究，提供了相关的数据，大大丰富了实验工作，也支持未来的缝坝设计阶段。数值计算结果表明，保留的固体材料的数量与实验测试相比，表明该模型提供了可靠的结果，从而能够支持工程师和决策者关于泥石流减灾。
This paper presents and discusses the results of laboratory tests and numerical simulations carried out to assess the efficiency of slit dams (open-type retention dams) and applicability as a short-term struc tural mitigation measure against debris flows in steep torrential channels. Inspired by common slit dam solutions, two different layouts of piers were tested in the experimental study – aligned and V-shaped. Some of the major experimental results about the sediment control efficiency are presented, showing that aligned layout is more appropriate to mitigate stony-type debris flows than the tested V-shaped solution. Actually, it was proved that slit-check dams mitigation efficiency is influenced by various variables and parameters, most of them previously studied by several authors, but also by pier layout in plan view. Considering aligned layout, 1.0d 95 to 1.4d 95 slit widths shall be considered to design effective slit dam solutions. Further, a numerical study was performed, providing relevant data that greatly enriched the experimental efforts and also support future slit dam design phases. The numerical results show similar quantities of retained solid material comparing with the experimental tests, indicating that the model provides reliable results, thus being able to support engineers and decision makers regarding debris flows mitigation.