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Deformation characteristics and thresholds of the Tanjiawan landslide in the Three Gorges Reservoir Area,China

Journal of Mountain Science 2022年第5期19卷 1370-1385页

作者： ZHANG Fu-ling DENG Mao-lin YI Qing-lin LU Shu-qiang ZHENG Wei-jun HUANG Hai-feng ZHU Xing Hubei Geological Disaster Prevention and Control Engineering Technology Research Center China Three Gorges UniversityYichang 443002China College of Civil Engineering&Architecture China Three Gorges UniversityYichang 443002China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610059China Natural Resources and Planning Bureau ofZigui County Yichang 443002China

Since the first impoundment of the Three Gorges Reservoir(TGR)in China in 2003,more than 5000 landslides including potential landslides were *** this paper,a deep-seated active landslide in TGR area was *** years’monitoring data and field investigations from 2006 to 2020 were used to analyze the deformation characteristics,influencing factors,and meteohydrological *** landslide showed a none-overall periodic movement pattern featuring acceleration during long-duration rainfall and rapid transition to constant creep after rainfall *** secondary sliding masses,No.1 and No.2,were defined via field *** reservoir has no impact on the deformation whereas long-duration-low-intensity rainfall is the main *** present,the cumulative displacements of the main sliding mass range from 0.9 to 3.2 m,and the deformation during the rainy season is gradually *** boundary of this landslide was formed,and the boundary of No.2 sliding mass became *** probability of the failure of sliding mass No.2 is very high under the conditions of continuous *** 15-day antecedent rainfall combined with 4-day cumulative rainfall could be the rainfall threshold which could be associated with the groundwater level S1 of 294 m above sea level for forecasting large deformation of Tanjiawan landslide.

关键词： Three Gorges Reservoir Deformation characteristics deep-seated landslide Rainfall threshold Groundwater threshold

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