Terzaghi
| • | correlation valid for clean sand and sand with gravel without account of the effective pressure |
Schmertmann (1978)
| • | correlation valid for various lithotypes |
Schultze-Menzenbach
| • | correlation valid for various lithotypes |
D'Appollonia and others (1970)
| • | correlation valid for sand, SC sand, NC sand and gravel |
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