Evaluation of the treatment effect of rear slope cutting on hydrodynamic pressure landslides:A case study  

作　　者：WANG Li HUANG Jun-jie CHEN Yong WANG Shi-mei FAN Zhi-hong GUO Fei LI Xiao-wei 

机构地区：[1]Key Laboratory of Geological Hazards on Three Gorges Reservoir Area(China Three Gorges University),Ministry of Education,Yichang 443002,China [2]College of Civil Engineering&Architecture,China Three Gorges University,Yichang 443002,China [3]Badong National Observation and Research Station of Geohazards,China University of Geosciences,Wuhan 430074,China [4]Central-South Institute of Metallurgical Geology,Yichang 443002,China

出　　处：《Journal of Mountain Science》2023年第7期1968-1983,共16页山地科学学报（英文）

基　　金：supported by the National Natural Science Foundation of China(No.U21A2031);Key R&D Program of Hubei Province(No.2022BAA047);China Postdoctoral Science Foundation(No.2021M701969);Open Fund of Key Laboratory of Geological Hazards on Three Gorges Reservoir Area(2022KDZ19);the Open Fund of Badong National Observation and Research Station of Geohazards(No.BNORSG-202207;No.BNORSG-202304)。

摘　　要：After the impoundment of the Three Gorges Reservoir,some huge ancient landslides were reactivated and deformed,showing typical hydrodynamic pressure landslide characteristics.The Baishuihe landslide was a typical hydrodynamic pressure landslide.The management department conducted slope cutting treatments from 2018 to 2019.To evaluate the treatment effect of rear slope cutting,this study analyzed the data of the surface deformation survey and field monitoring over the past 20 years and the characteristics of the reservoir water-triggered Baishuihe landslide deformation,and calculated the seepage field,displacement field,and stability coefficient before and after landslide treatment.The results showed that the deformation of the Baishuihe landslide was primarily related to a decrease in the reservoir water level.Owing to the poor permeability of the landslide soil,the decrease in the reservoir water level produced a seepage force pointing to the outside of the landslide body,leading to the step deformation of the landslide displacement.The landslide was treated by rear slope cutting,and the“step”deformation of the landslide disappeared after treatment.The hydrodynamic pressure caused by the change in reservoir water after cutting the slope did not disappear.However,as the slope cutting greatly reduced the overall sliding force of the landslide,its stability was greatly improved.Notably,high stability can still be ensured under extreme rainfall after treatment.Slope cutting is effective for treating hydrodynamic pressure landslides.This study can provide effective technical support for the treatment of reservoir landslides.

关 键 词：Hydrodynamic pressure landslide Three Gorges Reservoir Slope cutting Load reduction Landslide monitoring Ancient landslides Reservoir water level fluctuation 

分 类 号：TV697.3[水利工程—水利水电工程] P642.22[天文地球—工程地质学]