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| Centrifugal experimental study on accumulation body landslides under complex reservoir operation and rainfall conditions |
| ZHANG Qiang1，2，ZHENG Yanni1，JIA Chaojun1，CHEN Hongjie3，CHENG Wei4 |
(1. School of Civil Engineering，Central South University，Changsha，Hunan 410075，China；2. Institute of Geotechnical Engineering，China Institute of Water Resource and Hydropower Research，Beijing 100048，China；3. Huaneng Lancang
River Hydropower Inc.，Kunming，Yunnan 650214，China；4. PowerChina Kunming Engineering Corporation Limited，
Kunming，Yunnan 650051，China) |
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Abstract Complex reservoir scheduling refers to the operating conditions in which the water level of the reservoir undergoes multiple rises and falls at varying rates. To study the triggering factors，evolution laws and instability mechanisms of the slope failure of the embankment on a typical accumulation body in the HD reservoir area，a centrifuge experimental system was developed to simulate the coupling effects of reservoir scheduling and rainfall. The experimental design involved a water level rise，slow water level fall，rainfall，and fast water level fall scenario. The entire experimental process was analyzed to investigate the deformation and failure mechanisms of the accumulation body slope under complex reservoir scheduling and rainfall conditions. The findings demonstrate that the slope deformation，which mostly manifests as local collapse at the slope's leading edge during the reservoir filling stage，is difficult to detect. When the reservoir water level drops sharply，the slope undergoes a staged sliding in the middle and lower parts which causes tearing cracks at the rear edge. Rainfall leads to surface erosion and overall subsidence of the slope，which exhibits traction failure symptoms. Although the rate of the second water level dip is twice that of the first，the slope deformation is mainly characterized by local traction sinking at the front edge.
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2023, Vol. 42 
