Dynamic Stability Analysis Of Worike High Fill Slope At Ganzi Airport

In this paper,the dynamic stability of the Worike high fill slope on the southeastern end of Ganzi Airport is studied.Firstly,the study of the geotechnical characteristics of the study area and the in-situ deformation of the high fill slope are carried out during the filling process.Stability dynamic monitoring,based on MATLAB data processing software,establishes a threedimensional solid model of high fill slope,using FLAC3 D numerical analysis software to analyze the slope deformation and stability,and combining with on-site monitoring data for comparative analysis.The results show that the high-filled slope has large settlement and large horizontal displacement.The stability reduction coefficient of the slope is about 1.65.The calculation results are in good agreement with the on-site monitoring data.Secondly,the dynamic response characteristics of high fill slopes under EL seismic waves are studied by using FLAC3 D numerical analysis software.The research shows that the acceleration effect of the high-filled slope on the input wave is obvious,the amplification factor increases with height,and the maximum is 2.44-3.8 times at the top of the slope.It is found that the amplification coefficient increases with the increase of air contact area and decreases with the increase of distance from the surface.The displacement vector direction is mostly opposite to the displacement vector direction of the lower bedrock,and the hysteresis is obvious.The deformation from the middle to the top is large during the seismic action,and the permanent displacement in the horizontal direction after the earthquake is about 0.10~0.15 m.The amount is 0.05 to 0.12 m.Finally,the GeoStudio finite element software is used to analyze the dynamic stability of the high fill slope by comparing the action characteristics of the slope with the waveform.The QUAKE/W module in the software is used to analyze the dynamic response characteristics of the slope.After comparing the feedback with the finite difference method,the dynamic stability calculation of the Worike high fill slope is obtained by the SLOPE/W module.Based on the time-history curve of the stability coefficient,the average minimum method of the period stability coefficient is proposed.Based on the time history curve of the seismic stability coefficient,considering the cumulative deformation and failure of the slope,the moment when the instantaneous stability coefficient is less than the safety factor and the initial stability coefficient of the slope are formed.The average minimum value of the time period is used as a criterion for slope stability evaluation.And compared with the quasi-static method,Liu Hanlong(2003)proposed formula calculation method,and the mean value stability coefficient method at different time periods.The research shows that the dynamic stability coefficient calculated by the method proposed in this paper is 1.056,and the other methods are conservative,especially the pseudo-static method.It can be judged that the high-fill slope is stable under earthquake action.The method proposed in this paper has certain guiding significance for dynamic stability analysis.