Impact Compaction Technology of Rockfill for Airfield-bed

Based on the particle characteristics of explosive rockfill granules and the characteristics of impact compaction technology,the principle of thick-layer rockfill reinforced by dynamic compaction is established.For different engineering requirements of various functional airport areas such as tract groove area and soil surfaced area,the impact reinforcement schemes of different areas and different layers are presented respectively.The dynamic response of the rockfill granules under the impact of hammer is revealed by numerical simulation of large displacement of rockfill,the dynamic compaction energy level,arrangement of compaction points and the parameters of hammer are reasonably determined based on the technical pilot test.According to the construction quality test results,it is necessary and reasonable to adopt different construction technologies of rockfill dynamic compaction which separately applied in different regions of airfield-bed,and the design parameters such as the virtual height and compaction spacing are verified.