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

Frontiers in Earth Science

Liang Li¹  Jieyuan Zhang¹  Gang Fan²  Xingguo Yang²  Jiawen Zhou² 

[1] College of Water Resource and Hydropower, Sichuan University, Chengdu, China;State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, China;

关键词: landslide dam;    field test;    overtopping failure;    dam breaching;    failure mechanism;   

DOI  :  10.3389/feart.2021.660408

来源: DOAJ

【 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.

【 授权许可】

Unknown