Spt Cpt Correlations: SAND
SPT blow count (N-value) and CPT cone resistance (qc) correlations to engineering properties — friction angle, relative density, undrained shear strength, and elastic modulus by soil type and density class
| soil type | n value mid | density consistency | elastic modulus tsf max (tsf) | elastic modulus tsf min (tsf) | friction angle deg max (deg) | friction angle deg min (deg) | friction angle deg typical (deg) | n value max (blows/ft) | n value min (blows/ft) | notes | qc max tsf (tsf) | qc min tsf (tsf) | qc typical tsf (tsf) | relative density pct max (%) | relative density pct min (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SAND | 2 | Very Loose | 30 | 10 | 28 | 26 | 27 | 4 | 0 | Corrected N60; phi per Meyerhof 1956 / Peck-Hanson-Thornburn 1974; Es per ASCE 7-16 commentary | 10 | 0 | 5 | 15 | 0 |
| SAND | 7 | Loose | 80 | 30 | 30 | 28 | 29 | 10 | 5 | Corrected N60; Es per Schmertmann 1978 correlation qc/Es~3.5 for young normally consolidated sand | 40 | 10 | 25 | 35 | 15 |
| SAND | 20 | Medium Dense | 200 | 80 | 36 | 30 | 33 | 30 | 11 | phi per Gibbs-Holtz 1957 / Meyerhof 1956; Es from Schmertmann 1978 | 120 | 40 | 80 | 65 | 35 |
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