Research of dynamic response patterns of high steep rock slope under earthquake effects

Base on the research of single-sided high steep slopes in southwestern China, dynamic responses of double-sided slopes are analysed which include changes of height, angle and width. Results show that predominant frequencies of slopes mainly concentrate in 1~4 Hz when inputting Ricker waves with varying center frequencies and the results alter in different parts of the slope. Dynamic response patterns mainly depend on slope height, contours of amplification coefficients parallel to the bottom of slope at lower heights while distribute as closed regions near surface when height increases. This means numerical value of amplification linearly increase with the height of the slope at a relatively low height but fluctuate at a great height. In addition, slope angle changes the direction of contours and makes amplification factors greater in steep slope, but dynamic patterns of slope are unaffected by those changes. Double-sided slopes show similar dynamic pattern with the single ones, but reflection and refraction of quake waves caused by slope shape make the amplification greater in double-sided slopes, which manifest as intensified contours and multiplied acceleration.