Abstract
Landslides, a devastating hazard, continue to happen, affecting the lives of thousands of people each year. Fluctuation in the Reservoir Water Level (FRWL) is one of the leading features disturbing the slope stability in reservoir areas, drawdown is more crucial than the rise to the stability of landslide. Latest studies grounded on field investigation and monitoring data propose that landslides in reservoir areas are initiated not solely by one issue like precipitation or FRWL, however conjointly by their joint actions. Zhulinwan landslide in Chongqing, China, Three Gorges Reservoir (TGR) area was analyzed by field investigation and numerical modelling to evaluate the characteristics of the landslide. The changes in landslide stability and deformation under the effect of reservoir drawdown and rainfall is analyzed using GEOSLOPE Software. The seepage analysis is done using SEEP W Model, afterward deformation and stability analysis using SLOPE W and SIGMA W respectively. The analysis confirmed that the coupling effect of reservoir drawdown at 1.2 m/d and rainstorm of once in 50 years return period makes the landslide unstable. Moreover, deformation at the same condition is maximum 0.049 m. The findings may be used by local authorities to help make decisions about slope stabilization in the event of a confirmed significant rainfall event. Doi: 10.28991/cej-2021-03091713 Full Text: PDF
Highlights
The Three Gorges Dam Project is the worlds largest hydropower project
The analysis results show that the seepage field of this landslide conforms to the general seepage law and has the following characteristics: (1) As the water level of the Three Gorges Reservoir (TGR) drops, the free surface of the infiltration line in the slope declines with time
The analysis show that the rainstorm has negative effect on landslide stability, but the reservoir drawdown remains the main factor effecting the overall stability of Zhulinwan Landslide
Summary
Many slopes became unstable and landslides happened in June 2003 when the reservoir level rose to 135 m [1]. In reservoir area more than 2000 landslides are reported that are strongly or partially affected by the water storage [2,3,4,5,6]. FRWL is one of the most significant extrinsic influences affecting landslide deformation and stabilization [7]. Still there is need to study the behavior of slope under heavy rainstorm coupled with reservoir drawdown. If the correlation among deformation behavior and precipitation or reservoir water level has been established, the landslide prediction model can be established [14]
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