Stability Analysis Of Bank Slope Of Songgang Wharf

With the continuous development of the South-to-North Water diversion project,the research on bank slope stability of many reservoirs along the route has become an important content related to the people’s livelihood of the country.Taking Songgang Wharf of Danjiangkou,Xichuan County,Nanyang City,Henan Province as the research object,this paper analyzes the stability of bank slope by collecting data and conducting engineering research.In this paper,numerical simulation is used to analyze and evaluate the current stability of bank slope and the development trend of possible failure.Numerical simulation is a forecasting method for landslide research and can provide data support for comprehensive prevention and control suggestions of geological disasters.For those working conditions that are difficult to pass the actual field test,numerical simulation can be used to complete the prediction of engineering stability.It is of practical value to reduce the harm caused by bank collapse and formulate corresponding treatment measures.Mainly through the safety factor of the bank slope and the sliding surface displacement as the auxiliary stability analysis and research,for the bank slope safety evaluation and development of the corresponding protective measures to provide a basis.The main research results are as follows:(1)Through the actual situation of the project,understand the engineering geological conditions and landslide conditions of the bank slope of Songgang Wharf,record the rainfall,water level change and other conditions,and analyze the main factors leading to the bank slope instability.(2)According to the actual soil layer parameters,understand and apply the limit equilibrium method,and calculate the stability coefficient of the bank slope under different working conditions and the general morphology of the sliding plane by using the Geostudio numerical simulation software,to obtain the stability coefficient of the bank slope under the natural state,and judge that the bank slope is in a basically stable state;Under simulated rainfall conditions,different amounts of rainfall are applied to the bank slope.According to the simulated calculation of stability coefficient,the influence of different amounts of rainfall on the bank slope stability coefficient is analyzed.Compared with the bank slope stability coefficient under the natural state,it is concluded that the bank slope safety coefficient decreases with the increase of rainfall,and the stability decreases continuously.When the water level rising condition is simulated,the bank slope stability is analyzed with different water level height,and the relationship between the different water level height and the bank slope stability coefficient is obtained.It is concluded that the bank slope stability will decrease continuously with the water level rising condition.Under seismic conditions,the stability coefficient of bank slope under different seismic intensities is obtained by applying seismic loads of different intensities,and the weakening effect of earthquake on bank slope stability is analyzed.(3)FLAC3D numerical simulation software was used to understand and apply strength reduction method,and stress-strain nephogram,displacement nephogram and safety factor were obtained through simulation to comprehensively analyze the stability of Songgang Wharf bank slope under different working conditions.It is concluded that the bank slope is in the basic stability state under the natural state.The simulation analysis under different rainfall conditions shows that rainfall has a weakening effect on the stability of bank slope.With the increase of rainfall,the safety factor decreases continuously.In the rainstorm condition,the bank slope is highly likely to produce sliding instability failure.Under the rising water level condition,the bank slope safety factor decreases gradually with the rising water level.When the normal water level is reached,the bank slope is in a completely unstable state,and the bank slope may collapse and have a large displacement.The bank slope safety factor,stress-strain and displacement nephogram under seismic conditions focused on the change of safety factor under different working conditions.Combined with the obtained displacement,the bank slope stability analysis was carried out,and it was concluded that the bank slope was in a serious instability state under the seismic condition of magnitude 8.(4)Comparative analysis was conducted based on the numerical simulation results of Geostudio and FLAC3 D,especially the comparison of the safety factor and the stability of the bank slope of Songgang Wharf under different working conditions,and the simulation results were basically the same.Combined with the simulation results,it was proposed to add a blind drainage ditch to Songgang Wharf.Concrete-modified soil and lattice vegetation are adopted to protect slope.