Stability Analysis of the Shiliushubao Landslide Based on Deformation Characteristics and External Trigger Factors in the Three Gorges Reservoir

Abstract

There exists the problem of landslide reactivation due to the seasonal fluctuation of rainfall and reservoir water level annually. Based on a large number of GPS monitoring data of the landslide mass after impoundment of the Three Gorges Reservoir in Shiliushubao landslide area, the relationship between the external trigger factors and slope stability could be obtained. A finite element calculation model has been established for the stability analysis of the Shiliushubao landslide after impoundment from January 2004 to October 2009. Through the deformation characteristics of the landslide, it is shown that the landslide exhibited a stepwise pattern on the whole, which developed faster after impoundment and slowed down in rainy seasons. The trend of the curve kept roughly opposite to the fluctuation of the safety factor. It suggested that the stability of the landslide mass was closely related to the seasonal fluctuation of the rainfall and the reservoir level, and the landslide deposits demonstrated to be reactive with them. The subject provides a certain reference value on the landslide stability analysis and the risk assessment within a similar engineering geological condition.

Slope protection effect of typical vegetation in the Three Gorges reservoir area under extreme rainfall

“…Specifically, extreme rainfall events significantly exacerbate these effects, leading to accelerated deformation and a higher risk of landslides. 8 , 9 , 10 , 11 Empirical analyses utilizing physical models have offered valuable insights into the effect of rainfall on slope stability. Sun et al.…”

A quantitative enhanced assessment for ancient landslide reactivation risk considering cross-time scale joint response mechanism

“…The reactivation risk of ancient landslides is the probability of slide and occurrence again, due to the influence of environmental and human triggering factors. (Luo et al, 2021;Huang et al, 2022;Xu et al, 2022). Related works indicate a certain path dependency of the dynamic evolution of ancient landslides in time series, which implies a high probability of landslides re-occurring in unstable areas where landslides have occurred before, and these will produce more severe disasters (Samia, 2018;Hu et al, 2022).…”

Analysis of deformation mechanism of rainfall-induced landslide in the Three Gorges Reservoir Area: Piansongshu Landslide

“…CT visualization technology was utilized to monitor and scan the failure process of the shear zone in real-time and to investigate the failure mechanism 5 . The stability of the landslide is evaluated by combining numerical models, and the accuracy of the modeling method is verified by field geological investigation 13 . The process can reproduce the dynamic response of the landslide under external forces and the process of rock movement and accumulation 14 .…”