Due to the significant differences in the intensity characteristics of near-fault ground motion in different directions, taking typical near-fault seismic records as an example, three ground motion intensity parameters were selected to compare the variability of ground motion intensity in various directions. Based on OpenSees finite element software, the difference of seismic response of slopes under different directions of seismic was analyzed. Considering the strain softening characteristics of soil, the influence of directional effects of seismic motion on the seismic stability of slopes was explored. The results show that the PGA variability of peak acceleration in different directions reaches 62.5%. The displacement response of the slope top in the direction of the maximum PGA under seismic action increases by 20.5% and 86.5% respectively compared to the two components recorded in the measured horizontal seismic motion. The variation range of slope safety factor under different directions of seismic action is 0.93-1.15. Ignoring the seismic direction may overestimate the seismic capacity of the slope and increase the risk of seismic instability. The research results can provide reference for slope seismic design and disaster prevention.

Slope  /  Ground motion directivity  /  Seismic response  /  Safety factor  /  OpenSees