Study On Dynamic Response Of Bedding Rock Slope Under Coupling Earthquakes

China is a mountainous country and mountain, plateau and hills accounts for69%of land area, so it objectively determines that there are plenty of natural slopes in our country. Meanwhile, our country is located between two of the most active earthquake zones, which makes earthquake distribution is wide and seismic activity is strong and frequency is high in the Middle Western region. And the seismic activity in recent years show that seismic activity in China is tend to be more active. Study on slope dynamic response under earthquake force is the basis of stability analysis of slope. Nearly half a century, reaearchers have poured nenormous enthusiasm into the dynamic response of slope and have made some achivment. But most of the research object modek is the relatively simple homogeneous slope, and the research degree of this problem at home and abroad is relatively low.This paper summarized the research status quo of the slope dynamic response, then the bedding rock slope is selected for the study direction. By using FLAC3D, author simulates the dynamic response characteristics of2D model of bedding rock slope under coupling vibration in two cases, the dynamic response characteristics of3D model of bedding rock slope under coupling vibration in two cases and the dynamic response characteristics of3D model of bedding rock slope under the condition of three-way coupling vibration. By analyzing of the slope surface displacement, time history curve of maximum displacement, and change of PGA amplification coefficient, author has made some major conclutions as follows:The change of slope surface displacement in the2D model of bedding rock slope under coupling vibration in two cases are mainly controlled by the level of the acceleration in X direction, and the slope displacement time history on the surface has a corresponding relationship with the peak value of acceleration of X direction. X direction maximum displacement under the coupling vibration increases by39.3%, which shows that coupling vibration effect is closer to actual situation and to the destruction of the rock mass effect is bigger than simple horizontal vibration simulation. Under coupling vibration in two case, all point slope lateral maximum displacement showed a trend of increase with the increase of the aV/aH, which proves slope body collapse is trigger by the effect of the coupling of horizontal and vertical tensile splitting seismic wave and the destruction of the vertical seismic action plays an important role. Meanwhile, the greater the aV/aH, the more severe damage, which confirms many workers’founds that the vertical seismic force play damage effect in magistoseismic area.The slope dynamic response characteristics of3D model has its unique characteristics as3D body, especially the distribution of the dynamic response characteristics along the slope length (Z-direction) dosen’t exist in2D slope model. Therefore, the numerical model calculation for slope should build3D model according to the actual length of the slope. As a result, we can make the simulation results closer to actual situation.Three-way coupling vibration is the simulation methods which is most close to the real situation of the earthquake and simulation results of3D bedding rock slope model under three-way coupling vibration is quite close to the actual situation, which not only can be used as a qualitative conclusion, to a certain extent, can also be used as the basis for quantitative. Different distribution of dynamic response characteristics along slope direction (Z-direction) also conforms to the reality of the slope slip points successively.