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Alternative TitleEroding Characteristics of Landslide Dams in Debris Flow Gullies After Earthquakes Case Study of Yindongzi Landslide Dam
赵高文1,2; 王萌1; 杨宗佶1; 田宏岭1; 姜元俊1
Source Publication工程科学与技术
Contribution Rank1
Other AbstractLandslide dams induced by strong earthquake in gullies are the important material source of debris flow hazards. Due to the intermittence of seasonal rainfall and the particularity of the gully topography, the eroding process of a landslide dam in the gully is obviously different from that of a landslide dam in the river channel. Taking the Yindongzi landslide dam as an example, the eroding characteristics of such dams were investigated. Based on years of on-site geological surveys and theoretical analysis, several results were found as follows: 1) The Yindongzi landslide dam suffered from the confluence erosion on the dam surface and a serial of eroding effects derived from the water flow or debris flow in the breach, including undercut erosion,lateral erosion and headcut erosion. 2) The huge height difference in transverse direction caused the initial breach of the Yindongzi landslide dam to occur on the side of dam and the direction of the lateral erosion induced by the water flow or debris flow in the breach was unidirectional. Under the joint action of this lateral erosion and the undercut erosion, the height of breach slope was gradually increased and the stability of dam was reduced. 3) The difference of soil strength in the upstream and downstream of Yindongzi landslide dam led to the different effects of confluence erosion on the dam surface. As the soil strength in the downstream was relatively low, the dam surface in this area was divided by two large cutting gullies and the integrity of dam was affected. 4) The special material structure of Yindongzi landslide dam led to a slow development of headcut erosion to the upstream and the eroding progress of the dam in downstream and upstream was inconsistent. With the combined action of various erosion effects, the height of breach slope in the downstream of the Yindongzi landslide dam was large and had a poor integrity. It is, therefore, likely to fall into instability and to form a secondary landslide. The secondary landslide will cause a large amount of loose material to enter the newly formed gully, providing a source of material for debris flow activity.
Keyword滑坡 堰塞坝 泥石流 漫顶破坏 侧向侵蚀 下切侵蚀 陡坎侵蚀
Indexed ByEI ; CSCD
EI Accession NumberAccession number:20194307591630
Citation statistics
Cited Times:1[CSCD]   [CSCD Record]
Document Type期刊论文
Corresponding Author王萌
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Corresponding Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
赵高文,王萌,杨宗佶,等. 震后泥石流沟内滑坡堰塞坝的侵蚀特征分析以银洞子堰塞坝为例[J]. 工程科学与技术,2019,51(5):68-77.
APA 赵高文,王萌,杨宗佶,田宏岭,&姜元俊.(2019).震后泥石流沟内滑坡堰塞坝的侵蚀特征分析以银洞子堰塞坝为例.工程科学与技术,51(5),68-77.
MLA 赵高文,et al."震后泥石流沟内滑坡堰塞坝的侵蚀特征分析以银洞子堰塞坝为例".工程科学与技术 51.5(2019):68-77.
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