Research On Seismic Dynamic Response Of Accumulated Slope Based On Shaking Table

As more and more large-scale infrastructure projects are built in areas with high seismic intensity,once an earthquake occurs,the resulting economic,political,and cultural losses will be immeasurable.Therefore,it is of great significance to study the response behavior of slopes under earthquake action.By systematically studying the seismic response of slopes,it can not only promote the improvement and innovation of slope seismic dynamics theory,but also provide some help for the design,construction and operation of related projects in earthquake areas in the future.In this paper,with the help of a large-scale shaking table model test,the typical topography of the Lhasa-Linzhi section of the new railway Sichuan-Tibet line is used as a prototype,a model slope is established based on the principle of similarity,and a shaking table test is carried out.The response law of the following,mainly includes response characteristics such as acceleration,strain and displacement;on this basis,the model slope is used as a prototype,and the relevant parameters of the basic model are changed by the numerical software Flac^3D,and several model slopes are established to study the impact of slope dynamics Response to regular terrain,geological and focal effects,and slope failure characteristics.The main research results are as follows:（1）Research on terrain effects.The specific performance is the difference in response to earthquakes at different positions of the slope and the effect of slope shape on the response acceleration.The research shows that the PGA magnification factor increases with elevation and increases with the decrease of the horizontal distance from the slope,that is,the"elevation magnification effect"and"surface effect",and the closer to the slope and the free Face,the greater the growth rate.The change of slope shape mainly affects the severity of the slope response,and has little effect on the transmission form of the response,and this effect is concentrated in the middle and upper part of the slope.（2）Research on geological effects.The specific manifestation is the influence of slope material strength and slope structural layer sequence change on slope response acceleration.Research shows that:material strength has a greater impact on slope dynamic response,slope strength decreases,and slope dynamic response increases;slope dynamics The response is affected not only by the overall strength of the slope,but also by the strength of the structural layer where the measurement point is located.（3）Research on source effect.The specific performance is the influence of the frequency,vibration intensity,duration and loading direction of the loading wave on the acceleration and displacement of the slope response.Studies have shown that:for slope response acceleration,the load wave frequency has the greatest influence,followed by vibration intensity;for slope displacement,the load wave vibration intensity and frequency have a greater influence.