Gibbs & Holtz, 1957
•correlation valid for any effective pressure
•Dr is underestimated for gravels and over estimated for silts
Skempton, 1986
•process valid for Normally consolidated silts, sands, and fine to coarse sands at any effective pressure
•Dr is underestimated for gravels and over estimated for silts
Schultze & Menzenbach (1961)
•for Normally consolidated fine and gravelly sand
•method valid for any effective pressure in Normally consolidated deposits
•Dr is underestimated for gravels and over estimated for silts.
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