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Undrained strength classification of clays according to BS 8004:1986, along with simple field tests (from [10]).
| stiffness state | undrained strength (kN m−2) | test |
|---|---|---|
| hard | >300 | can be scratched by thumb nail |
| very stiff | 150–300 | can be indented by thumb nail |
| stiff | 75–150 | can be indented slightly by thumb |
| firm | 40–75 | thumb makes impression easily |
| soft | 20–40 | finger pushed in up to 10 mm |
| very soft | <20 | finger easily pushed in up to 25 mm |
