Failure Mechanism of Colluvial Landslide Influenced by the Water Level Change in the Three Gorges Reservoir Area

Abstract

The stability of the reservoir bank landslide is affected by a variety of external factors, and the fluctuation of reservoir water level is one of the important influencing factors. The Erdaohe landslide is a typically colluvial landslide in the Three Gorges Reservoir area with periodic reservoir water level fluctuations. According to landslide displacement data, the displacement of the Erdaohe landslide exhibits the significantly stepwise feature. Its failure mechanism was analyzed using strength reduction method by the FLAC3D package in the case of reservoir water level changes. The results indicate that the hydrodynamic pressure has an important impact on the initialization of the landslide failure. When reservoir water level rises rapidly or maintains constant at the lower level, the landslide stability would be higher. When the reservoir water level decreases rapidly or maintains constant at the higher level, the landslide stability will be smaller. When the reservoir water level was in the lowest elevation, the factor of safety (FS) reached the minimum value of 1.11. Findings in this paper can provide guidelines for the risk assessment of colluvial landslides.

Evaluation and Prediction of Landslide Susceptibility in Yichang Section of Yangtze River Basin Based on Integrated Deep Learning Algorithm

“…Yichang is located in the junction of the middle and lower reaches of the Yangtze River at the lower end of the Three Gorges Reservoir area (Figure 2). The famous Three Gorges Dam is built in Yichang City [46,47]. Therefore, the…”

“…Yichang is located in the junction of the middle and lower reaches of the Yangtze River at the lower end of the Three Gorges Reservoir area (Figure 2). The famous Three Gorges Dam is built in Yichang City [46,47]. Therefore, the research on resource protection and geological disaster prevention in the Yichang area of the Yangtze River Basin has significant practical value.…”

Reservoir landslide monitoring and mechanism analysis based on UAV photogrammetry and sub-pixel offset tracking: a case study of Wulipo landslide

“…The construction of hydropower stations is now one of the most efficient approaches to obtain water resources and clean energy (Tang et al, 2019;Cao et al, 2021). However, secondary geological hazards caused by the construction of hydropower station, such as reservoir landslides, can pose serious impacts on civil and transportation facilities (Manenti et al, 2018;Wang et al, 2019;Reyes-Carmona et al, 2020;Jiang et al, 2021a;Alonso et al, 2021).…”

“…However, secondary geological hazards caused by the construction of hydropower station, such as reservoir landslides, can pose serious impacts on civil and transportation facilities (Manenti et al, 2018;Wang et al, 2019;Reyes-Carmona et al, 2020;Jiang et al, 2021a;Alonso et al, 2021). For example, in Southwest China, around 2619 landslides have been activated by the fluctuation of reservoir water level in Three Gorges Reservoir since June 2003 (Cao et al, 2021). Among the landslide disasters mentioned above, the typical one is the Qianjiangping landslide which led to 30 m impulse wave, caused 24 casualties, destroyed 346 houses and capsized many ships (Tang et al, 2019).…”

“…For reservoir landslides caused by reservoir impoundment, one of the most important ways to prevent and mitigate them is to obtain their initiation and movement processes through certain monitoring means, and elaborate their deformation, damage mechanisms and potential destabilization possibilities, so as to provide basis for the management and administration of landslide hazards (Tang et al, 2019;Cao et al, 2021;Wang et al, 2023a;Wang et al, 2023b;Wei et al, 2023). Up to date, a large number of researchers have studied the initiation and movement process of reservoir landslides (Gutiérrez et al, 2015;Kaczmarek et al, 2015;Gu et al, 2017;Wang et al, 2021;Chen et al, 2022;Wu et al, 2022), and the results show that the deformation characteristics of reservoir landslides can be mainly divided into four stages: the stabilization period before impoundment, the large deformation and destabilization at the time of the first impoundment, the cyclic deformation caused by the rise and fall of the water level during the operation of the reservoir, and the overall destabilization and destruction of the landslides.…”