Abstract: Due to the complexity of the subsurface conditions in different areas and the factors that might potentially affect the blow counts in the Dynamic Cone Penetration Tests (DCPTs), it is proved that the correlation between blow counts obtained by different hammer weights, N120 and N63.5, are not unique. Soils in different areas might have different relationship. This paper discusses the relations between N120 and N63.5 in the sandy, gravelly and cobble soils in Deyang area.

Key words: Dynamic Cone Penetrometer Tests, Hammer Energy Ratio, InSitu Testing, Sandy Gravelly Cobble Soils