Abstract:Under the construction conditions of the existing slag subgrade, the dynamic compaction method is used to treat the road subgrade. By the analysis and summary of the dynamic compaction test section, the design concept of "integral stiffness of hard shell" is used. The reasonable and feasible dynamic compaction construction technology is put forward. Combined with the shallow impact pressing treatment of subgrade, the good treatment effect of subgrade is achieved. The repeated excavation of the existing subgrade under non-consolidation is avoided. The economy of the project is effectively guaranteed. The good social benefit is achieved.