Study on Dynamic Response of Subgrade Soil and Change Rule of Compaction Degree Based on FLAC3D Subgrade Model
In order to investigate the effect of compaction degree on dynamic response of subgrade soil under seismic load,a subgrade model was established by FLAC3D simulation software to analyze the effect of compaction degree on dynamic response of subgrade soil under seismic load.The results show that the vertical amplification coefficients of displacement,velocity and acceleration decrease with the increase of com-paction degree,while the horizontal amplification coefficients are inversely related to compaction degree.When the compaction degree increases by 1%,the vertical displacement amplification coefficient decreases by 0.48,the velocity amplification coefficient decreases by 2.57,and the acceleration amplification coefficient decreases by 11.8.The horizontal displacement amplification factor increases by 1.8,the velocity amplifi-cation factor increases by 0.8,and the acceleration amplification factor decreases by 0.4.In conclusion,measures to strengthen embankment and increase the degree of compaction should be taken respectively to limit the horizontal and vertical seismic response of subgrade.
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