| The Baishuihe landslide in the Three Gorges reservoir area is a typical Quaternary deposit.Landslide lithology,geological structure,topography and other intrinsic factors control the development of landslides,and external factors such as rainfall and reservoir water level change,resulting in reduced stability of landslides.It plays an important role in inducing landslide development.The groundwater level during the cut-off period of the reservoir water level will also change with the decrease of the reservoir water level.Under the condition of continuous rainfall infiltration during the same period,the seepage field,pore water pressure and effective stress in the landslide will change,which will reduce the stability of the landslide and induce the Landslide Destabilization Causes Geological Disasters.The Baishuihe landslide has been in a state of continuous deformation since the impoundment of the Three Gorges Reservoir in 2003,during which several times of more severe deformation occurred and is currently in an unstable state.At present,the Baishuihe landslide is experiencing heavy rain and water levels.When it is in a critical state during cutting,the stability factor is less than 1.0,and overall instability may occur.In this paper,taking the Baishuihe landslide as an example,a numerical simulation method is used to analyze the deformation mechanism and stability of the Baishuihe landslide.Based on this analysis,the landslide treatment measures are studied to provide a practical solution for the actual landslide treatment.The main research contents and work development of this article mainly include the following:1)Explain the geological environment of the Three Gorges reservoir area,such as the basic situation,geological conditions,geological structure,hydrogeology and bank slope structure.According to the macroscopic deformation of Baishui landslide and the displacement deformation monitoring data and hydrological data from 2003 to 2016,combined with the change of reservoir water level,the dominant factors that have a great impact on the deformation of Baishuihe landslide are analyzed.2)Analyze the deformation characteristics and influencing factors of Baishui landslide based on the macroscopic deformation of the landslide and the displacement deformation monitoring data and hydrological data from 2003 to 2016.The influence of reservoir water level and rainfall on the deformation of baishuihe landslide was determined by monitoring the data of deformation displacement and reservoir water level and rainfall.3)Coupling and Stability Analysis of Seepage Field and Stress Field in Baishuihe Landslide Using Geotechnique SEEP/W,SLOPE/W and SIGMA/W Modules in 2D Finite Element Numerical Simulation Software.Mainly include: in 2015,the actual working conditions and design condition of 175m-145 m to 0.67m/d,0.67 m/d speed down and162m-145 m to 2 m/d,1m/d water drop under the most adverse stress coupling seepage field and stability and pore water pressure calculation,and obtain: 1.The stability of the landslide under rainfall conditions will become smaller;2.Under different working conditions,the pore water pressure decreases,the effective stress increases,but the speed decreases The larger the groundwater hysteresis is,the more obvious the hydraulic gradient is and it is not conducive to the stability of the landslide.4)The prevention and treatment research plan adopt slope cutting and internal drainage.The effectiveness of the seepage flow,stability,and calculation of stress and strain are verified through the actual operating conditions and design conditions.The results obtained are that both options have enhanced the Baishuihe landslide.The internal drainage can reduce the water level line in the landslide,accelerate the seepage of the groundwater and reduce the pore water pressure in the slippery body,which is favorable for the stability of the landslide.5)The comparison of the two research schemes in terms of economy,technical reliability,and construction feasibility suggests the use of a slope-cutting scheme... |
PDF Full Text Request