Directed against 8 kinds of coarse-grained soil with different gradations, through surface vibrated compaction test method in the lab, authors researched the effect of the gradation property of the coarse-grained soil, the vibration frequency and the excitation force of the compaction equipment on the compaction properties of coarse-grained soil. Using multi-linear regression method, the influence of gradation property of soil sample on compaction effect of coarse-grained soil was analyzed. In the end, the relational formula between the maximum dry density and its gradation characteristic granular diameter of coarse-grained soil was established, and the gradation characteristic function was put forward, which made the maximum dry density of the coarse-grained soil relate with its gradation properties directly. The results show that the relations between the dry density and the vibration frequency, the dry density and the excitation force of the coarse-grained soil are almost accord with normal distribution, which means that there are optimum vibration frequency and optimum excitation force for different coarse-grained soils.
Key words
road engineering /
coarse-grained soil /
experimental research /
vibrated compaction property of subgrade /
gradation characteristic function
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