Application of Dynamic Compaction Method in Old Subgrade Reconstruction

In the synthetical utilization and reconstruction of old subgrade,dynamic compaction is a simple,economical,time-saving method. Base on the study of the rule and mechanism of uneven settlement caused by the construction of highway utilizing the old subgrade,some suggestions for guiding the disposal of foundation and reinforcement of subgrade are proposed,and a set of scientific and rational construction project of dynamic compaction is established,thus the old subgrade can be effectively utilized to construct expressway.