Frequent soil landslide events are recorded in the Three Gorges Reservoir area,China,making it necessary to investigate the failure mode of such riverside landslides.Geotechnical centrifugal test is considered to be the most realistic laboratory model,which can reconstruct the required geo-stress.In this study,the Liangshuijing landslide in the Three Gorgers Reservoir area is selected for a scaled centrifugal model experiment,and a water pump system is employed to retain the rainfall condition.Using the techniques of digital photography and pore water pressure transducers,water level fluctuation is controlled,and multi-physical data are thus obtained,including the pore water pressure,earth pressure,surface dis-placement and deep displacement.The analysis results indicate that:Three stages were set in the test(waterflooding stage,rainfall stage and drainage stage).Seven transverse cracks with wide of 1-5 mm appeared during the model test,of which 3 cracks at the toe landslide were caused by reservoir water fluctuation,and the cracks at the middle and rear part were caused by rainfall.During rainfall process,the maximum displacement of landslide model reaches 3 cm.And the maximum deformation of the model exceeds 12 cm at the drainage stage.The failure process of the slope model can be divided into four stages:microcracks appearance and propagation stage,thrust-type failure stage,retrogressive fail-ure stage,and holistic failure stage.When the thrust-type zone caused by rainfall was connected or even overlapped with the retrogressive failure zone caused by the drainage,the landslide would start,which displayed a typical composite failure pattern.The failure mode and deformation mechanism under the coupling actions of water level fluctuation and rainfall are revealed in the model test,which could appro-priately guide for the analysis and evaluation of riverside landslides.

Fasheng Miao;Yiping Wu;ákos T?r?k;Linwei Li;Yang Xue

Faculty of Engineering,China University of Geosciences,Wuhan 430074,China;Engineering Research Center of Rock-Soil Drilling&Excavation and Protection,Ministry of Education,Wuhan 430074,China;Department of Construction Materials and Engineering Geology,Budapest University of Technology and Economics,Budapest,Hungary;College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China

地学前缘（英文版）

[1]Fasheng Miao;Yiping Wu;ákos T?r?k;Linwei Li;Yang Xue-.Centrifugal model test on a riverine landslide in the Three Gorges Reservoir induced by rainfall and water level fluctuation)[J].地学前缘（英文版）,2022(03):196-209

riverside,Liangshuijing,Gorgers,waterflooding

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