Large-Scale Field Test Study on Failure Mechanism of Non-Cohesive Landslide Dam by Overtopping

被引：7
|
作者：
Li, Liang [1 ]
Yang, Xingguo [1 ,2 ]
Zhou, Jiawen [1 ,2 ]
Zhang, Jieyuan [1 ]
Fan, Gang [1 ,2 ]
机构：
[1] Sichuan Univ, Coll Water Resource & Hydropower, Chengdu, Peoples R China
[2] Sichuan Univ, State Key Lab Hydraul & Mt River Engn, Chengdu, Peoples R China
来源：
FRONTIERS IN EARTH SCIENCE | 2021年 / 9卷
基金：
中国国家自然科学基金; 国家重点研发计划;
关键词：
landslide dam; field test; overtopping failure; dam breaching; failure mechanism; JINSHA RIVER; EARTHQUAKE; SOUTHWEST; CHINA; SOIL;
D O I：
10.3389/feart.2021.660408
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
In recent years, landslide lake disasters occur frequently in southwest mountainous areas of China. Considering the influence of dam size and discharge channel location, three large-scale field tests were carried out in a natural river to study the failure process and mechanism of non-cohesive soil landslide dam, and the process and mechanism of non-cohesive landslide dam breach were analyzed. The results show that the dam size and discharge channel location have a significant influence on the breach mechanism of the landslide dam. The dam failure process can be divided into three stages: the initiation stage, the development stage and the failure stage. When the discharge channel is located close to the bank, the width of the breach is smaller, and the volume of the residual dam body is larger. The more stable the dam body is, the longer the breach process time is, and the smaller the peak discharge is. This study can provide a scientific reference for the emergency disposal and risk assessment of landslide dam.
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页数：11
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