Abstract: In order to study and compare the seismic response of railway embankment slopes of different compaction degrees, shaking table model tests on railway embankment slopes with compaction degrees of 95%, 91%, 87% and 83% in embankment noumenon are designed and carried out. White noise excitations are interspersed among seismic waves to obtain dynamic characteristic parameters of embankment slopes with different compaction degrees. Different amplitudes and different types of seismic waves are performed to study the distribution behaviors of acceleration magnification along the height of embankment slopes and their influential factors. The results show that the natural vibration frequencies of embankment slopes decrease, and damping ratios increase with the increase of seismic excitations. The dynamic characteristics of embankment slopes are greatly affected by the compaction degree of embankment noumenon. Acceleration amplifications increase nonlinearly along the height of embankment slopes; and the acceleration amplifications decrease with the increase of input excitation intensity. The embankment slopes make the spectrum characteristics of input seismic waves change greatly; and the spectrum characteristics of acceleration responses differ among the embankment slopes of different compaction degrees. The distributions of acceleration magnification of different compaction degree embankment slopes differ under excitations of different seismic waves, which are influenced by both of the spectrum characteristics of seismic waves and dynamic characteristics of embankment slopes.

Key words: railway embankment slope, compaction degree, natural vibration frequency, seismic response, shaking table test