Study On Deformation Characteristics And Stability Of Shuping Landslide In Three Gorges Reservoir Area Before And After Emergency Treatment

The Three Gorges Reservoir area is the multiple area of geological disasters in China.Especially since the Three Gorges dam is impounded,the original geological conditions have changed greatly.Landslides,collapses and other geological disasters frequently occur,such as the Chongqing Jipazi landslide(1982),the Xintan landslide(1985),the Qianjiangping landslide(2003)and the Liangshuijing landslide(2009),which bring serious disasters to the Yangtze River shipping and the residents on both sides.Therefore,the treatment and prediction of landslide hazards in the reservoir area must be strengthened,and measures and countermeasures for disaster prevention and reduction must be taken,so as to minimize the losses caused by landslides.The emergency treatment project of the Shuping landslide in the Three Gorges Reservoir is taken as the research object in this paper.According to the survey data and the professional monitoring data of the Shuping landslide,the cumulative displacement,the water level,the rainfall and the macroscopic deformation of the GPS professional monitoring point from 2003 to 2016 of the Shuping landslide are comprehensively analyzed and analyzed,the deformation characteristics are studied,and the trend of seepage field,stress field and stability before and after landslide treatment is simulated and researched by Geo-studio software.The main contents of this paper are as follows:1)The field investigation of the Shuping landslide is carried out,and the topography,geomorphology,spatial form,material composition,structure characteristics,hydrogeological condition and physical parameters of the landslide are studied and analyzed,and the emergency treatment project is discussed.2)After considering the engineering geological conditions and stability of the landslide area,the weight reduction project is used in the emergency treatment project of the shuping landslide.The slide force of the upper body is cut by the clipping project,the stability of the lower part is increased by the filling works,the influence of rainwater on the landslide is weakened by drainage works,and the monitoring and early warning of the landslide in the later stage is strengthened.3)Based on the grey GM-BP neural network to predict and analyze the monitoring data before treatment,the trend term of the landslide displacement is extracted by the grey GM(1,1)model,and the BP neural network model based on the multivariable influence factor is established to predict the deviation of the landslide displacement,the possible deformation quantity before sliding is obtained and compared with the quantity after treatment,which shows the effectiveness of the treatment.4)According to the deformation characteristics before and after the treatment and influencing factors of Shuping landslide,Seep/W,Slope/W and Sigma/W modules in Geo-studio software are used to simulate the seepage field,stress field and stability under various working conditions.The changes in the internal seepage field,stress field and the trend of its stability before and after the emergency treatment are simulated through the working condition that different falling rate of reservoir water level is combined with rainfall.The research on the emergency treatment of the Shuping landslide in the Three Gorges Reservoir area is studied in the text,and it provides a theoretical basis for the prevention and treatment of other geological hazards and the emergency treatment projects,which has practical engineering significance.