Experimental study of breach process of landslide dams by overtopping and its initiation mechanisms
Experimental study of breach process of landslide dams by overtopping and its initiation mechanisms
复制标题
滑坡坝漫漫溃决过程及其引发机制试验研究
DOI：
10.1016/s1001-6058(15)60550-9
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发表时间：
2015-12
影响因子：
2.5
通讯作者：
Li Wen-ping
中科院分区：
文献类型：
--
作者：
Yang Yang;Cao Shu-you;Yang Ke-jun;Li Wen-ping
本文研究了溢流坝溃口冲刷过程的物理过程，特别是溃口形成过程。由于所涉及的巨大的复杂性，只考虑均质滑坡坝。为研究溃坝扩展过程，进行了漫坝水槽试验。为了揭示渗流在溃口发展过程中的作用，还考虑了坝体材料的渗透特性。通过试验观测，研究了溃口发育过程，将溃口发育过程划分为5个阶段：第一阶段为渗透侵蚀阶段，第二阶段为初始溃口形成阶段，第三阶段为向溃口头部的侵蚀阶段，第四阶段为溃口的扩大和切割阶段，第五阶段为溃口对河道的再平衡阶段。结果表明，一旦触发，整个溃坝过程将持续不断，突出了早期阶段对大坝后期变形的重要影响。证据表明，大坝的初始溃口最有可能发生在大坝的下游边坡，靠近渗流面的上边缘。实验结果表明，缺口的形成是一种“切头”机制。
The present paper studies the physics of the breach erosion process, particularly, the breach initiation process in over-topped landslide dams. Due to great complexities involved, only homogeneous landslide dams are considered. The flume experiments of dam overtopping are conducted to study the breach growth process. And in order to reveal the effects of the seepage during the breach development, the permeability characteristics of the dam materials are also taken into consideration. With the experimental observation, the details of the breach growth are examined, and the whole breach process could be distinguished into five stages, ie, Stage I, the seepage erosion, Stage II, the formation of the initial breach, Stage III, the erosion toward the head, Stage IV, the expansion and incision of the breach, and Stage V, the re-equilibration of the river channel through the breach. It is shown that once triggered the entire breach process goes continually without stop, which highlights the significant impact of the early stages on the later deformation of the dam. Evidence shows that the initial breach of the dam is most likely to take place in the downstream slope of the dam, near the upper edge of the seepage face. The experimental results show a “headcut” mechanism of the breach initiation.
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影响因子：
2.4
作者：
R. Frenette;I. Pestov
通讯作者：
R. Frenette;I. Pestov
DOI：
--
发表时间：
1998-12
期刊：
--
影响因子：
--
作者：
P. Visser
通讯作者：
P. Visser
影响因子：
2.4
作者：
G. R. Powledge;D. C. Ralston;P. Miller;Yung-Hai Chen;P. Clopper;D. Temple
通讯作者：
G. R. Powledge;D. C. Ralston;P. Miller;Yung-Hai Chen;P. Clopper;D. Temple
影响因子：
2.9
作者：
M. Harr
通讯作者：
M. Harr
影响因子：
7.4
作者：
Gensheng Zhao;P. Visser;P. Peeters;J. Vrijling
通讯作者：
Gensheng Zhao;P. Visser;P. Peeters;J. Vrijling