Effects Of Ground Motion Parameters On Soil Slope Dynamic Response

Earthquake-induced landslides are a common secondary disaster.The study found that the global distribution of seismic and landslide zones is highly consistent,which shows the great impact of earthquakes on landslides.Therefore,the slope seismic stability analysis is the primary task.At present,the law and correlation analysis of the influence of ground vibration parameters on slope dynamic response are less studied,and in the analysis of slope seismic dynamic stability,the selection of ground vibration parameters is not unified.To solve this problem,with two-dimensional homogeneous soil slope as the object,based on ABAQUS finite element numerical simulation and mathematical methods,selected 100 actual vibration records with different seismic peak acceleration(PGA),peak speed(PGV),peak displacement(PGD),Arias strength(AI),absolute cumulative speed(CAV),holding time,characteristic period and four effective peak acceleration(EPA),calculating the correlation coefficient of ground parameters and soil slope seismic dynamic response under different characteristics.The main study findings are as follows:(1)Influence law and correlation of ground vibration parameters and the final deformation and displacement response of soil slope.The correlation coefficient between the seismic parameters and the final deformation displacement response of the soil slope is greater than 0.9 is PGV and PGD.Therefore,PGV and PGD should be given priority to the final deformation displacement response and disaster assessment.(2)Law and correlation of ground vibration parameters and stress response of soil slope.The seismic parameters with the correlation coefficient of Mises stress response of soil slope greater than 0.8 are PGV,AI,PGD,EPA and PGA;The correlation parameters of the Max.Principal response greater than 0.9 are PGV,PGD and EPA;The correlation and slope S₁₂response above 0.6 are PGV,AI,PGD,EPA and PGA.In conclusion,the three intensity indexes of PGV,PGD and EPA should be best considered best when studying the soil slope stress response or disaster assessment.(3)Study of the effective peak acceleration index.The correlation coefficient between the EPA and the soil slope dynamic response is basically the same definition;The correlation coefficients between EPA and soil slope dynamic response ranged from high to low:EPA₁,EPA₂,EPA₃,and EPA₄.Therefore,the EPA₁strength index should be considered best when choosing the seismic parameter index to study the soil slope power response or disaster assessment.(4)For the correlation of the same seismic parameters and the soil slope dynamic response,overall,Max.Principal,final deformation displacement,Mises stress,S₁₂.Therefore,Max.Principal is recommended to study the dynamic response of the ground vibration.(5)Changes of horizontal and vertical stress in the soil slope.On the whole,Mises stress,Max.Principal gradually increase vertically down and horizontally inward along the slope body,with the maximum Mises stress,Max.Principal at the S₃point;S₁₂gradually increases vertically downward along the slope body,S₁₂has small medial shear stress along the slope body,large on both sides,and maximum S₁₂at point S₅..