黄土地基高能级强夯室内模型试验研究

In order to study the soil deformation law and reinforcement effect in the process of high-energy dynamic consolidation of loess foundation, based on indoor model tests, multiple groups of parallel tests were used to study the effects of water content, compaction energy, hammer drop distance and hammer diameter changes on the compaction settlement of high-energy dynamic consolidation of Loess Foundation, and the effective reinforcement depth was calculated in combination with ABAQUS finite element software. The results show that when the moisture content of loess foundation is the optimal moisture content, the effect of high-energy dynamic compaction is the best; The optimal compaction times of the same loess foundation strengthened by 6 000 kN m, 8 000 kN m, 12 000 kN m and 15 000 kN m energy level dynamic compaction are 13, 12, 10 and 9 respectively; Using "heavy hammer low compaction" to achieve the design reinforcement effect requires fewercompaction times than "light hammer high compaction"; Compared with the large diameter rammer, the small diameter rammer can improve the effect of dynamic compaction; The numerical simulation results are in good agreement with the model test results. The effective reinforcement depths of the same loess foundation strengthened with 6 000 kN m, 8 000 kN m, 12 000 kN m and 15 000 kN m energy levels are 8.8 m, 9.9 m, 11.1 m and 12.2 m respectively.