Page 86 - 水利学报2021年第52卷第5期

Study on deformation response of Muyubao landslide in Three Gorges region under different
water fluctuation rates by centrifugal model test

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FENG Wenkai ，YI Xiaoyu ，MENG Rui ，XIAO Ruihua ，SU Yongchao ，ZHU Quanwei 4
（1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，
Chengdu University of Technology， Chengdu 610059，China；
2. Sichuan Academy of Territorial Space Ecorestoration and Geohazard Prevention，Chengdu 610081，China；
3. China Institute for Geoenvironmental Monitoring，Beijing 100081，China；
4. China Railway Southwest Research Institute Co.，LTD，Chengdu 611731，China）
Abstract： Surface displacement monitoring and centrifuge model test are used to study the deformation re⁃
sponse law of Muyubao landslide under different rates of reservoir water lifting and falling. The following un⁃
derstandings are obtained：（1） Under the action of gravity and reservoir water in the Muyubao landslide，
the driving section continuously compresses the locking section， resulting in the push type creep deforma⁃
tion. （2） The deformation of the Muyubao landslide is mainly affected by reservoir water level elevation
and fluctuation rate，while the influence of rainfall on landslide deformation is limited. When the water lev⁃
el is 165-175m，the higher rising rate of reservoir water can cause landslide deformation events with month⁃
ly cumulative displacement greater than 30mm. In comparison， the lower reservoir water lowering rate can
cause a large number of landslide deformation events with monthly cumulative displacement greater than
30mm. When the water level is 145-165m，the landslide's deformation response to the rise and fall rate of
reservoir water decreases， and the accumulated monthly deformation of the landslide is less than 30mm.
（3） The deformation of the landslide is related to reservoir water buoyancy and hydrodynamic pressure.
When the rise and fall rate of reservoir water is low，the water head difference between inside and outside
the slope is minimal. The reservoir water buoyancy controls the deformation of the landslide. After the rise
and fall rate of reservoir water，the increase of water head difference between inside and outside the slope
leads to the enhancement of hydrodynamic pressure， which makes the deformation of landslide weaken in
the stage of reservoir water lifting. The deformation in the descending phase of reservoir water is strength⁃
ened. （4） The deformation response of the Muyubao landslide is self-adaptive， and the first impoundment
has the most significant effect on the landslide's stability. The landslide's sensitivity to the reservoir water
fluctuation response is weakened in the subsequent periodic reservoir water rise and fall process. The above
research results can provide a useful reference for landslide control and reservoir water dispatching optimiza⁃
tion in the Three Gorges Reservoir area.
Keywords： Three Gorges reservoir area； Muyubao landslide； reservoir water fluctuation rates； deformation
response

（责任编辑：耿庆斋）

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