Performance of a large-scale slope model subjected to rising and lowering water levels

Jia, Gao; Zhan, Tony L. T.; Chen, Yunmin; Fredlund, D. G.

doi:10.1016/j.enggeo.2009.03.003

Cited by 147 publications

(74 citation statements)

References 7 publications

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“…As the water level fluctuates, the hydraulic conductivity and the rate of change in water level are the two factors that dominate the transient flow response, which directly influences the stability of the landslide (Yan and Wang 2010;Zhan et al 2006). The pore pressure and surface water pressure, which affect landslide stability, can also change as the water level changes (Desai 1977;Fredlund and Rahardjo 1993;Hu et al 2005 andJia et al 2008). Upon reservoir impoundment or rapid drawdown there will be a decrease in slope stability, which may lead to slope failures.…”

Section: Introductionmentioning

confidence: 97%

Relationship between landslide stability and reservoir water level variation

Xia

Ren

Zhu

et al. 2014

Bull Eng Geol Environ

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Landslide deposits have been observed to reactivate in association with water level fluctuations of reservoirs. The Shiliushubao landslide is an example of a mass movement where an accelerated deformation rate was triggered by the impoundment of a reservoir (the Three Gorges Reservoir in this case). This work investigated the relationship between the stability of this landslide and the variation in the reservoir water level. The stability of the landslide after reservoir impoundment was evaluated from February 2004 to December 2009 based on a sensitivity analysis of the hydraulic conductivity and the fluctuations in the level of the reservoir. The results suggest that the stability of the landslide is influenced by the rate of fluctuation in the level of the reservoir and the hydraulic conductivity. When the surface displacement monitoring data was integrated with the numerical modeling results, it became apparent that the stability of the Shiliushubao landslide increases as the reservoir water level is increased, whereas it decreases as the reservoir water level is lowered to avoid a dam breach during flood season.

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Section: Introductionmentioning

confidence: 97%

Relationship between landslide stability and reservoir water level variation

Xia

Ren

Zhu

et al. 2014

Bull Eng Geol Environ

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“…Important results of some recent studies are summarized in the following. Research on large-scale slope models subjected to rising and lowering water level reveals the physical behavior and failure mode of a saturatedunsaturated soil slope subjected to water level fluctuations (Jia et al 2009). On the condition of a sudden drawdown of the reservoir water level, transient seepage can affect suction and shear strength of unsaturated soil and can reduce landslide stability (Fu et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of Qiaotou Landslide deformation caused by drawdown of the Three Gorges Reservoir, China

et al. 2010

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Landslides located beside reservoirs tend to be unstable or are characterized by large deformation during the drawdown process. This has been accepted by many experts. In this paper, we use Qiaotou Landslide, which is located beside the Three Gorges Reservoir (TGR), as a typical case study to investigate and predict the deformation mechanism during the drawdown process of TGR in detail. According to field investigation, the landslide mass is mainly composed of thick, loose silt and clay mixed with fragments of rock. Bedrock is mainly composed of silty sandstone. Field and laboratory tests indicate that the landslide mass has a high permeability coefficient. If the water level declines fast, intense seepage force may result. Based on these data, we establish a three-dimensional geological model of Qiaotou Landslide by FLAC 3D and perform a numerical simulation using the saturatedunsaturated fluid-solid coupling theory. For the simulation, we assume that the drawdown from 175 to 145 m takes place with a speed of 25 cm/day, which is based on the extreme water level regulation program of TGR. The simulation shows that this causes a significant deformation in the landslide mass and that the maximum displacement within the landslide is 24.2 cm. During the drawdown process, the maximum displacement zone is shifting from the upper part of the landslide where bedrock surface is steeper and thickness of loose deposits is less to the middle part of the landslide where bedrock surface is less steep and thickness of loose deposits is higher. The deformation mechanism indicates that in the early stage of the drawdown the deformation of the landslide mass is mainly caused by seepage and in the later stage mainly by consolidation.

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“…Slope failures occur if the reduced shear strength becomes less than the resisting shear strength needed for equilibrium (Kim and Lee 2010). Several analyses have been proposed to simulate the infiltration process and its corresponding impact on slope stability (Gasmo et al 2000;Jia et al 2009;Ng and Shi 1998). It would be advantageous to integrate a rainfall infiltration model into slope stability analysis to get a better understanding of slope stability variation during rainfall.…”

Section: Introductionmentioning

confidence: 98%

GIS-based three-dimensional slope stability analysis considering rainfall infiltration

Jia

Yang

Xie

et al. 2014

Bull Eng Geol Environ

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Rainfall-induced landslides are a major cause of slope failure in mountainous areas. As rainfall begins to infiltrate a slope the wetting front advances into the soil and reduces its shear strength. Slope failures occur when the reduced shear strength becomes less than the resisting shear strength needed for equilibrium. These areas of instability are usually located near the ground surface where pore-water pressure changes rapidly during infiltration. The wetting front depth in a slope plays an important role in slope stability. In this study a well-known infiltration model, the Green and Ampt model, is integrated into three GIS-based three-dimensional limit equilibrium methods to assess the impact of rainfall on slope stability. This infiltration model can predict the depth of the wetting front during steady and unsteady rainfall. The applied three-dimensional methods are modified according to different positions of the wetting front to reflect the influence of rainfall on slope stability. This approach is capable of calculating safety factors corresponding to individual rainfall events and is also capable of predicting the corresponding failure time. The accuracy of the presented study has been verified by simulating the failure process of a real landslide triggered by a rainstorm.

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Performance of a large-scale slope model subjected to rising and lowering water levels

Cited by 147 publications

References 7 publications

Relationship between landslide stability and reservoir water level variation

Relationship between landslide stability and reservoir water level variation

Numerical simulation of Qiaotou Landslide deformation caused by drawdown of the Three Gorges Reservoir, China

GIS-based three-dimensional slope stability analysis considering rainfall infiltration

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