Experimental Study On The Dynamic Response And Deformation Failure Of The Layered Rock Slope

Earthquake,as a common natural disaster,is an important factor that induces geological disasters such as slope collapse,landslides,and mudslides.It often causes serious damage to people's lives,property,and national economic construction.China is a country where earthquakes occur frequently.With the construction of various large-scale infrastructures and the deep implementation of the Western Development Strategy,many engineering projects will be carried out in the mountainous areas and highly seismic regions in the west,inevitably involving many problems of seismic stability of slopes.Therefore,it has very important theoretical research significance and engineering practice significance to strengthen the research on the dynamic response and deformation and failure mechanism of slopes under the action of earthquakes.This paper analyzes the dynamic response characteristics and deformation failure mechanism of the anti-dip layered rock slope under the action of earthquakes and the influence of the ground motion parameters on the dynamic response and deformation of the slope through the shaking table model test,and the model test results were verified by the numerical simulation method.The main work and results of the thesis are as follows:(1)Based on the characteristics of typical rock mass structure and lithology in the earthquake-stricken areas,a conceptual model of the anti-dip layered rock slope is constructed,and the shaking table model test is designed and completed.The work includes the selection of similar materials,the determination of similar relationships,the design of the model slope and the model box,the placement of the acceleration sensors,and the study and formulation of the loading scheme.(2)By inputting different seismic waves to the bottom of the model slope,the deformation and failure characteristics of the model slope and the entire process of deformation and failure are observed and recorded.After analyzing the test results,we find that the failure mode of the slope is: Earthquake induced---Loose deformation of the top and superficial parts---The development and expansion of the cracks and inter-layer displacement increasing---The damage to the top and superficial parts increasing---The development of the cracks and inter-layer displacement increasing in the foot of the slope,causing large-scale collapse of the slope,and scattered rocks accumulate at the foot of the slope.(3)By analyzing the acceleration response data,the acceleration response laws of the model slope are analyzed from the perspective of response peak acceleration and acceleration amplification factor,and the influence of the ground motion parameters on the dynamic response laws of the slope is also discussed.The results show that the model slope has obvious elevation amplification effect and irregular trending-surface magnification effect on seismic acceleration;The rock mass at the bottom of the slope has a significant inhibitory effect on seismic waves;Seismic wave frequency,vibration intensity,and seismic wave holding time have different degrees of influence on the dynamic response laws of the slope.(4)Using the numerical simulation technology of UDEC to build a numerical model,perform dynamic calculation and analysis,and verify the results of the shaking table model test,the numerical analysis results are consistent with the results of the shaking table model test.