Abstract: For the feasibility of subgrade fill materials, extensive laboratory compaction tests are performed on the poorly graded boulder, gravelly coral reef soils from Sanya Areas. The number of material preparation layers and levels of the compaction energy on the compaction results are examined. The feasibility of using the coral reef debris for the roadway construction and its construction techniques are also discussed in the paper.

Key words: Coral Reef Gravelly Soils, Number of Compaction Layers, Compaction Energy, Subgrade Soils