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Volume 41 Issue 6
Nov.  2022
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Article Navigation >  Bulletin of Geological Science and Technology  > 2022  >  41(6): 105-112
Liu Yiliang, Tang Xuan, Xu Fangdang, Song Kun, Chen Jianxiang, Xue Xin, Gao Chenxi, Yi Qinglin. Landslide deformation hysteresis regularity based on permeability of landslide and reservoir water change[J]. Bulletin of Geological Science and Technology, 2022, 41(6): 105-112. doi: 10.19509/j.cnki.dzkq.2022.0205
Citation: Liu Yiliang, Tang Xuan, Xu Fangdang, Song Kun, Chen Jianxiang, Xue Xin, Gao Chenxi, Yi Qinglin. Landslide deformation hysteresis regularity based on permeability of landslide and reservoir water change[J]. Bulletin of Geological Science and Technology, 2022, 41(6): 105-112. doi: 10.19509/j.cnki.dzkq.2022.0205
shu

Landslide deformation hysteresis regularity based on permeability of landslide and reservoir water change

doi: 10.19509/j.cnki.dzkq.2022.0205
  • 1.

    Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, Yichang Hubei 443002, China

  • 2.

    College of Civil Engineering & Architecture, China Three Gorges University, Yichang Hubei 443002, China

  • 3.

    11th Geological Team of Zhejiang Province, Wenzhou Zhejiang 325006, China

  • Received Date: 16 May 2022
    Abstract

  • The deformation evolution of reservoir landslides of ten lags behind the variation in the reservoir water level during the operation of the Three Gorges Project, showing a deformation hysteresis effect, and the hysteresis effect is different with the difference in the permeability coefficient and fluctuation rate of reservoir water. Taking the Baijiabao landslide in the Three Gorges Reservoir area as an example, the variation law of the deformation lag time under different permeability coefficients k and reservoir water level decline rates v is studied by field investigation, monitoring data analysis and numerical simulation. The results show that when the permeability coefficient of the landslide is constant, the higher the decreasing rate of reservoir water level is, the more obvious the groundwater lag. When the reservoir water level drops at a certain rate, the greater the permeability coefficient of the sliding body is, the faster the groundwater drop.When the permeability coefficient of the sliding body is 0.85 m/d, the higher the rate of reservoir water level decline is, the shorter the deformation lag time of the landslide.The corresponding lag time is 3.74-9 d under different decline rates of the reservoir water level.When 0.47 < v/k < 1.18, 0.24 < relative deformation lag time < 1; when 1.18 < v/k < 2.38, 0 < relative deformation lag time < 0.24. When the reservoir water level decline rate is constant, the larger the landslide permeability coefficient is, the shorter the landslide deformation lag time is. Under different reservoir water level decline rates, the change rule of the relative deformation lag time with increasing v/k value is roughly the same, v=1.8 m/d, and the corresponding lag time of different permeability coefficients is 1.7-8 d. When 0.52 < v/k < 0.84, 0 < relative deformation lag time < 0.16; when 0.84 < v/k < 2.12, 0.16 < relative deformation lag time < 0.43; when 2.12 < v/k < 9, 0.43 < relative deformation lag time < 1. The research results have strong application value for the prediction and warning of reservoir landslides.

     

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