Terzaghi and Peck (1948)
•correlation valid for clean sand and sand with gravel without account of the effective pressure
Schmertmann et al. (1978)
•correlation valid for various lithotypes
Parameters a, b and c assume different values and depend on lithology and the presence of fine material.
Schultze and Menzenbach (1961)
• correlation valid for various lithotypes
D'Appolonia et al., 1970
•correlation valid for sand, SC sand, NC sand and gravel
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