Abstract: In a conventional geotechnical investigation, the standard penetration test (SPT) is often utilized when a silty fine sand layer is encountered and the heavy dynamic penetration test (HDPT) is rarely used in the practice. The HDPT is often influenced by the operator's experience and factor factors and leads to a large testing error of these tested data. The tested data are then need to be carefully evaluated before they are used for the design purposes. Based on the test data obtained for the updating of Liaoning provincial code: Technical Code for Building Foundations and Soils, both SPT and HDPT data in the silty fine sand layers are compared and analyzed. The bearing capacity values determined by both methods are also compared. The correlations between SPT and HDPT are established for the design purposes.

Key words: Silty Fine Sand, Standard Penetration Test, Heavy Dynamic Penetration Test