Characteristics and mechanism of dynamic deformation of Baijiabao lanslide with stepwise in Three Gorges Reservoir area
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Abstract:
A stepwise cumulative displacements curve is usually presented for these landslides in the Three Gorges Reservoir, under the condition of reservoir water fluctuation and rainfall, which means the deformation of the landslide in reservoir is a typical stepwise process. In order to understand the dynamic deformation mechanism, stability and deformation trend of stepwise landslides in the Three Gorges Reservoir, taking Baijiabao landslide as an example, this paper used the information of field geological survey and exploration, and monitoring data of more than ten years, analyzed the dynamic deformation characteristics, mechanism, influence factors and stability of Baijiabao landslide in detail, and predicted the deformation trend. The results showed that, due to the poor soil permeability of landslide body, the underground water in landslide could not be discharged in time during the drawdown of reservoir water, so the decline speed of groundwater was much slower than that of reservoir water, and then increasing the seepage force in the landslide body apparently, further reducing landslide stability. In addition, the faster the drawdown rate, the faster the movement of the landslide was.
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