Application Study of Impact Compaction Technology in Wetness and Softness Loess Roadbed Treatment

In order to study the applicability and strengthening effect of impact compaction technology in wetness and softness loess roadbed treatment, impact compaction technology was applied in ground treatment and layered filling roadbed compact of a freeway sub-grade construction, and compactness and settlement of the soil were also measured. Test results suggest: impact compaction technology can effectively apply to shallow wetness and softness loess roadbed treatment and the most effective depth is about 80cm, and this effect appears to increase with the impact compaction times and 30 impact compaction times is the most suitable. As regards the layered filling sub-grade, when the loose paving thickness is 40cm, compactness after 40 times compaction can satisfy specified demand. At the same time, combined with the test settlement, the control criterion of impact compaction quality is investigated.