Experimental Analysis of Reinforcement Effect of Dynamic Compaction on High Fill Subgrade
Taking a highway reconstruction and expansion project in Sichuan Province as an example,this paper carried out a dynamic rein-forcement test of high-fill roadbed,and analyzed the correlation between the compacting degree of high-fill roadbed and the Rayleigh wave ve-locity by using Rayleigh wave method.The results show that the correlation between the wave velocity and the degree of compaction is approxi-mately linear,and the degree of subgrade compaction increases by 0.19%when the wave velocity increases by 1 m/s.The difference of com-paction degree between Rayleigh wave monitoring method and in-situ sand filling method is about 3.5%,and the wave velocity and compaction curve are relatively consistent under the conditions of the two methods.The compaction depth of the compaction point after tamping is signifi-cantly increased,and the improvement range is11.7%～18.7%.Improving soil compaction can effectively improve the construction quality of subgrade soil.The research results prove that the Rayleigh wave method has a certain reliability in testing soil compactness,and the dynamic compaction scheme adopted can effectively improve the compactness of the roadbed,and confirm the reliability of the reinforcement effect of the high fill roadbed.
High fill subgradeDynamic compaction methodDensityRayleigh wave velocity
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