The Monitoring-Based Analysis on Deformation-Controlling Factors and Slope Stability of Reservoir Landslide: Hongyanzi Landslide in the Southwest of China

Abstract

Reservoir landslide is a type of commonly seen geological hazards in reservoir area and could potentially cause significant risk to the routine operation of reservoir and hydropower station. It has been accepted that reservoir landslides are mainly induced by periodic variations of reservoir water level during the impoundment and drawdown process. In this study, to better understand the deformation characters and controlling factors of the reservoir landslide, a multiparameter-based monitoring program was conducted on a reservoir landslide-the Hongyanzi landslide located in Pubugou reservoir area in the southwest of China. The results indicated that significant deformation occurred to the landslide during the drawdown period; otherwise, the landslide remained stable. The major reason of reservoir landslide deformation is the generation of seepage water pressure caused by the rapidly growing water level difference inside and outside of the slope. The influences of precipitation and earthquake on the slope deformation of the Hongyanzi landslide were insignificant.

An Attempt to Quantify the Lag Time of Hydrodynamic Action Based on the Long-Term Monitoring of a Typical Landslide, Three Gorges, China

“…In landslide research, it is known to all that hydrodynamic action plays an important part in the analysis of landslide stability [14][15][16][17][18], especially for reservoir bank accumulational landslides. Many researchers have focused on investigating the hydrodynamic factors' action mechanism.…”

An Inversion Study of Reservoir Colluvial Landslide Permeability Coefficient by Combining Physical Model and Data-Driven Models

“…The Hongyanzi landslide is located in Hongyanzi Village, Hanyuan County, Sichuan Province, China, on the south bank of the Dadu River, approximately 23 km upstream of the Pubugou Dam (Figure 1) [25]. This landslide exhibits a semicircular plane shape, with a length of approximately 600 m and a width of 580 m, covering an area of approximately 34 × 10 4 m 2 (Figure 2).…”

“…In these monitoring activities, the GWL is a key monitoring object. For example, professional GWL monitoring has been conducted for reservoir landslides such as the Hongyanzi landslide in the Pubugou reservoir [25] and the Shuping landslide in the TGRA [26], accumulating a large amount of time-series data of landslide GWL. These data provide abundant resources for the inversion study of landslide ks and inject new momentum into the development of this field.…”

Inducing factors and deformation mechanism of the Zhangjiacitang landslide in the Three Gorges Reservoir Area

“…Commonly used landslide monitoring techniques mainly include surface displacement monitoring, deep displacement monitoring, groundwater level monitoring, and rainfall monitoring, among which displacement monitoring changes directly reflect the macroscopic phenomena of landslide deformation and indirectly reflect the changes of various indicators inside the slope in different stages of deformation 29 , 30 . Therefore, many scholars employ landslide monitoring technology to integrate real-time monitoring data with field site investigations and numerical simulations for the study of factors and causal mechanisms inducing landslide deformation, primarily through qualitative analysis 25 , 31 – 33 . However, only a few studies have determined the main controlling factors of landslide deformation through quantitative analysis and subsequently analyzed the landslide's triggering mechanism by combining the displacements of monitoring points with the dynamic processes of reservoir water level changes and rainfall patterns.…”