Abstract
On August 21, 2020, a landslide occurred in Zhonghai village of Hanyuan County, Sichuan Province, China. The landslide is triggered by two successive rounds of heavy rainfall. This landslide can be clearly divided into an initial landslide and a main landslide. The main landslide is activated by the intense impact and overloading of the initial landslide. The depth-integrated continuum method is adopted to simulate the dynamic process. Due to the complicated failure process, it is found that there is no proper unified parameters in Coulomb model which could well reproduce the two successive landslides. It implies that the dynamic process of landslides is highly associated with the characteristics of sliding bodies. Here, an implement of variable frictional coefficients for different parts is proposed and the parameters are calibrated. It is demonstrated that results from numerical modeling match well with the field investigation. The complicated landslides in two different stage can both be efficiently revealed by depth-integrated continuum modeling.
Highlights
Rainfall especially continuous rainfall and heavy rainfall is the most common cause of landslides
Empirical-statistical methods mainly focus on Dynamic Process of Zhonghai Landslide geometrical correlations: 1) the correlation between the angle of reach and the landslide volume (Scheidegger 1973; Corominas 1996; Hunter and Fell 2003); 2) the correlation between deposition area of landslide and the landslide volume (Iverson et al, 1998; Griswold and Iverson 2008); 3) the correlation between the travel distance and other geometrical parameters (Finlay et al, 1999)
The landslide occurred at Zhonghai village in Hanyuan County is comprehensively analyzed by field investigation, aerial image recognition and numerical modeling
Summary
Rainfall especially continuous rainfall and heavy rainfall is the most common cause of landslides. At 3:50 am, on August 26, 2020, after two rounds of heavy rainfall, the steep slope in the upper area became unstable and formed the initial landslide. Under the influence of the impact and loading of the initial landslide, the slope in the middle area had intense deformation, resulting in two unstable mass and triggering the main landslide. The landslide mass on the road has been cleared and the destroyed buildings have increased the deposition depth, leading to an difference between the simulated results and the real depth. From the aspect, the distribution of friction coefficient is reasonable
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