! [ Figure 4.9. Consistency of fine soils

The related terms, plasticity index IP and liquidity index IL are defined as:

The strength of fine soils is described by the terms extremely low, very low, low, medium, high, very high, and extremely high and classified by the undrained strength cu measured in a field or laboratory strength test. See Figure 4.10.

Uncfrairiecl shear strength cu (kPa)

Extremely low I Very low


Medium I


Very high I Extremely high

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