Numerical analysis of dynamic response of double quarry dump slope under seismic loads
After the earthquake,it is easy to produce various geological disasters,and the earthquake is also one of the important factors causing landslides in dumps.The purpose of this paper is to study the stability and deformation characteristics of slope under the action of earthquake.Taking a double quarry dump as the research object,the double quarry dump was stratified according to the field survey,the three-dimensional topography was established by Rhino software.The seismic load numerical simulation based on time history analysis method for dumps was carried out by FLAC3D software,the displacement time history curve was studied,and the safety factor time history curve and the PGA amplification coefficient characteristics were analyzed.The results of this paper:seismic load on the dump lateral displacement response was more significant,the displacement response in the direction of gravity was relatively small.The higher the elevation,the more significant the impact of earthquake on the displacement deformation of dump area.With the increase of seismic intensity grade,the maximum displacement at different feature points was greater,showing a good linear relationship.The higher the seismic intensity grade,the greater the impact on the overall stability of the slope.With the increase of the amplitude of seismic load,the PGA amplification coefficient overall showed a free surface amplification effect.With the increase of the slope elevation,the amplification effect had a certain attenuation trend.The seismic frequency near the natural frequency of the slope was easy to cause resonance phenomenon,which led to a significant increase in the amplification coefficient of PGA.At this frequency,the gain effect of slope elevation on PGA value was more obvious.This paper finally concludes that the dump in this study is in a stable state.The significance of this study:to provide a theoretical basis for the safety production and engineering protection of the dump.
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