Abstract:In order to solve the problem that heat and vacuum negative pressure decrease in soil which leads to uneven reinforcement effect during vacuum thermal consolidation, the vacuum thermal consolidation combined dynamic compaction method is applied in the reinforcement treatment of engineering waste slurry utilize the characteristics of soil compaction can be improved by dynamic compaction method. The influence of different tamping time on the reinforcement effect of soil was studied by conducting four groups of model tests.. The results show that when the settlement rate is 4cm/3d, the tamping time is the best, the average settlement of soil surface is 26.5%, 11.72% and 3.74% higher than that of other test, and the treatment effect of engineering waste slurry is the best, which can effectively solve the poor reinforcement effect of deep soil under vacuum thermal consolidation and improve the uniformity of soil. Combined with the results of microstructure analysis, it can be found that due to the redistribution of pores between soil particles, the soil density is higher, and the shear strength increases accordingly under the appropriately tamping time. In addition, the drainage channels formed by the micro-cracks generated by the redistribution of internal pores can promote drainage and further improve the consolidation effect.Therefore, the shear strength and consolidation degree of the soil can be promoted under the appropriate tamping time.