Abstract: The site for the Coking Coal-Electricity-Steel integration project in Panxian County, Guizhou, is required to have high cut and high fills. The fill area is improved by the dynamic compaction and the degree of compaction after the compaction should be greater than 97% of the maximum dry density. The water-fill method is used for the in situ density test. Comparing with the laboratory Proctor test results, it is found that the in situ testing is more realistic since soils with grain size larger than 40 mm are removed in the Proctor test.

Key words: Degree of Compaction, Maximum Dry Density, Laboratory Proctor Tests, In Situ Density Tests