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| Deformation characteristics and inducing mechanisms of a super-large bedding rock landslide triggered by reservoir water level decline in Three Gorges Reservoir area |
| TAN Linyun1，2，3，HUANG Runqiu1，PEI Xiangjun1 |
| (1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu，Sichuan 610059，China；2. Geohazard Prevention Center of Chongqing，Chongqing 400015，China；3. National Breeding Base of Technology and Innovation Platform for Automatic-monitoring of Geological Hazards，Chongqing Engineering Research Center of Automatic Monitoring for Geological Hazards，Chongqing 401120，China) |
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Abstract Based on the GNSS monitoring data of Jiuxianping landslide in the Three Gorges Reservoir area from June 2016 to August 2018，comprehensive multi-factor dynamic process analysis and quantitative analysis are performed to analyze the response characteristics and the inducing mechanisms of landslide deformation under seven different changing processes of reservoir water level(RWL). The research results show that the falling of the RWL is the main inducing factor for the deformation of Jiuxianping landslide. In general，the greater the rate of the RWL decline，the worse the stability of the landslide. Landslide deformation can be promoted by intense rainfall including short-term heavy rainfall，continuous heavy rainfall and intermittent heavy rainfall during the falling period and the 145 m maintaining period of RWL，while it can hardly be promoted by any type of intense rainfall in the RWL rapid rising period(＞0.5 m/d). For inducing landslide deformation，heavy rainfall can compensate with the RWL decline rate. In other words，generally speaking，the greater the RWL decline rate，the smaller the threshold of the precipitation which could induce the landslide deformation. That is to say，for a reservoir wading landslide，the rainfall threshold is not fixed but varies greatly with the process of the RWL change. As the direction of the seepage pressure points into the inside of the slope during the RWL rising-falling transition period，neither of the intense rainfall nor the RWL falling rate can induce the landslide deformation for about a few days to more than ten days. During the period of high frequency and low amplitude fluctuations of the RWL，the direction of the total seepage pressure generally points into the inside of the slope，therefore，the apparent landslide deformation cannot be induced by the RWL decline in this period. These research results are meaningful for the deformation inducing mechanism analysis，dynamic risk management，emergency treatment，and early warning criteria of monitoring for the reservoir wading landslide.
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2021, Vol. 40 
