Research On The Dynamic Process Simulation And Acceleration Response Rules Of Bedding Rock Slopes Under Seismic Loads

With the rapid development of our country economy,the advancement of the western development strategy,the implementation of The Belt and Road initiative,the matched infrastructure is under construction.Due to the wide distribution of bedding rock slope and frequent earthquakes in southwest mountain area,the stability of the bedding rock slope will inevitably be encountered.The dynamic response process of slope is the key factor affecting the failure mode of slope,so study of the bedding rock slope seismic dynamic response will be helpful to the evaluation of regional stability and the analysis of early disaster warning,it also can be used in the reference of engineering optimization in disaster prevention and mitigation.In this paper,the dynamic response of bedding rock slope are studied.The main jobs include the following aspects:(1)The research progress of the seismic slope stability analysis method,the dynamic response rules of slope and the mechanism of deformation and failure is summarized.And the research status and shortcomings of the quasi-static method,Newmark sliding-block analysis method,the numerical simulation method,the physical model test method,the probability analysis method are briefly analyzed.(2)Through the analysis of the landslide literature and related data about large bedding rock slope induced by Wenchuan earthquake in 2008,the model of bedding rock slope is constructed,and the shaking table model test of the 1:100 slope is designed and completed.The dynamic response rules of acceleration in different positions is studied through the PGA amplification factor.With the increase of earthquake frequency,the natural frequency of the model slope decreases gradually,while the damping ratio increases gradually.The differences of the seismic wave spectrum characteristics lead to different dynamic responses of the slope.With the enlargement of the seismic wave amplitude,the dynamic response degree of the slope increases gradually.(3)Based on the FLAC3 D software,the numerical simulation of the shaking table model test is carried out.The results of the numerical simulation are consistent with the results of the shaking table model test,verifying the correctness of the numerical method.It is the basis for the subsequent numerical simulation.(4)The dynamic response and distribution rules of different parts under sine wave is deeply analyzed by changing parameters,such as slope structureand ground motion parameters.The impact of slope structure and two-way coupling on the acceleration response of the slope is more significant than the impact of earthquake dynamic time and initial vibration direction.(5)Taking Donghekou landslide of Qingchuan County as the prototype,the dynamic response progress of slope under the real earthquake is simulated,analyzing the dynamic response of the slope surface,the vertical section,the horizontal section and the top of the slope.The dynamic response includes acceleration,velocity and displacement response.By analyzing the changes of the seismic wave in the slope and the development trend of the plastic zone,it is found that the slope displays the tension and shear failure mode.