Hazard assessment by 3D stability analysis of landslides due to reservoir impounding |
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| Authors: | H B Wang W Y Xu R C Xu Q H Jiang J H Liu |
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| Institution: | (1) School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, Wuhan, 430074, People’s Republic of China;(2) Hubei Key Laboratory of Control Structure, Huazhong University of Science and Technology, Wuhan, 430074, People’s Republic of China;(3) Geotechnical Institute of Hohai University, Nanjing, 210078, People’s Republic of China;(4) Survey Institute of Three Gorges, Yangtze River Water Resources Commission, Yichang, 443000, People’s Republic of China;(5) School of Water Resource and Hydropower, Wuhan University, Wuhan, 430072, People’s Republic of China |
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| Abstract: | The Yudonghe landslide is located in a upcoming reservoir region of a 233-m-high Shuibuya rockfill dam, 2,300 m away from
the dam site. It consists of a massive landslide with upper and lower segments and two secondary slides, i.e. an eastern secondary
slide and a western secondary slide. In this paper, values of factor of safety (FS) for various masses were calculated in
a scenario of reservoir impounding-induced increase in groundwater levels, using a method of three-dimensional (3D) limit
equilibrium. Results showed that the smallest value of FS for the massive landslide is 1.12 computed on the presupposition
of reactivating along a bottom slide zone in case of an earthquake. The smallest FS value of the lower slide mass is 1.12
in a possible direction, given earthquake occurrence and a groundwater level of 225 m above the sea level. This FS value shows
that the lower slide mass is stable in case of groundwater increasing. In addition, by the calculation of the 3D limit equilibrium
method, the FS value of the east secondary slide is approximately 1.0 in different groundwater levels under consideration
of earthquake occurrence, which reflects that this mass is prone to reactivate when external factors are taken into effect. |
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| Keywords: | Landslide Reservoir impounding 3D stability analysis Hazard assessment |
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