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.
Highlights
Landslide and floods in China are a large amount of socioeconomic disruptions, property damages, and casualties, and they are caused by multiple factors including the geography [1, 2], the geological tectonism [3,4,5], hydraulic alteration [6], flood alluvial [7], earthquake [8, 9], climate change [10, 11], and anthropogenic engineering constructions [12]. e ree Gorges Dam has provided huge hydropower resources and mitigated the devastating effects of deluges with time tested for the past decades ago [13, 14], while there exists some geological disasters owing to the drastic fluctuation of the reservoir water level
The researchers have found that the changes of the water level would affect the safety of the reservoir bank via numerical simulation [15, 16] and/or field investigation [17, 18]. e hydraulic conductivity and the rate of the water level changes dominate the transient flow response which directly controls the stability of the landslide [19, 20]. e pore pressures and the water surface pressure can affect the stability of the landslide [21, 22] in the form of drag force outside the slope and impair the soil shear strength and the geophysical characteristics [23, 24]
Combined with the field investigation data, the numerical analysis using Comsol Multiphysics was conducted to investigate the dynamic failure process of the landslide mass under the fluctuation of the reservoir water level and precipitations. This subject attended on the evolution of the changes of the safety factors to determine the changes of the stability of the reservoir bank with the grey relational grade. e results of the numerical modeling and the surface deformation were able to accurately explain why the stability of the Shiliushubao landslide increased as the reservoir water level rose, whereas it decreased as the reservoir water level dropped during the flood season
Summary
Landslide and floods in China are a large amount of socioeconomic disruptions, property damages, and casualties, and they are caused by multiple factors including the geography [1, 2], the geological tectonism [3,4,5], hydraulic alteration [6], flood alluvial [7], earthquake [8, 9], climate change [10, 11], and anthropogenic engineering constructions [12]. e ree Gorges Dam has provided huge hydropower resources and mitigated the devastating effects of deluges with time tested for the past decades ago [13, 14], while there exists some geological disasters owing to the drastic fluctuation of the reservoir water level.In the recent years, the researchers have found that the changes of the water level would affect the safety of the reservoir bank via numerical simulation [15, 16] and/or field investigation [17, 18]. e hydraulic conductivity and the rate of the water level changes dominate the transient flow response which directly controls the stability of the landslide [19, 20]. e pore pressures and the water surface pressure can affect the stability of the landslide [21, 22] in the form of drag force outside the slope and impair the soil shear strength and the geophysical characteristics [23, 24]. The researchers have found that the changes of the water level would affect the safety of the reservoir bank via numerical simulation [15, 16] and/or field investigation [17, 18]. Numerical simulations and field investigations are widely used to study the deformation and the stability mechanism of the landslide [29], and there are a few research studies attending to apply the integrated. Combined with the field investigation data, the numerical analysis using Comsol Multiphysics was conducted to investigate the dynamic failure process of the landslide mass under the fluctuation of the reservoir water level and precipitations. This subject attended on the evolution of the changes of the safety factors to determine the changes of the stability of the reservoir bank with the grey relational grade. e results of the numerical modeling and the surface deformation were able to accurately explain why the stability of the Shiliushubao landslide increased as the reservoir water level rose, whereas it decreased as the reservoir water level dropped during the flood season
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