Abstract
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.
Highlights
Landslide dam is one of the most devastating natural disasters worldwide, especially in the mountainous areas of Southwest China
The results show that the dam breaching mechanism is similar to the laboratory tests, but the duration is longer, and the peak discharge of dam breaching is small (Hoeeg et al, 2004; Morris et al, 2007)
By conducting three large-scale field model tests in a nature river channel, the overtopping failure process of the landslide dam was investigated in this study
Summary
Landslide dam is one of the most devastating natural disasters worldwide, especially in the mountainous areas of Southwest China. Five large-scale field tests with the dam height of 4–6 m were carried out for different dam materials, sizes, and failure modes. Three field tests with different dam size and discharge channel location on a natural river in mountainous area of Southwest China, were carried out to reveal the failure process and mechanism of the landslide dam. Water depth is large, these two conditions cannot be considered Since this test does not aimed at any specific landslide dam, the parameters such as the size of the dam, the material of the dam and the flow pattern of the burst flood are not designed during the test. When the construction of the model landslide dam is completed and the impounding begins, the diversion pipe was blocked with a waterproof retaining plate
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