Soil Type

Typical Value for Poisson’s Ratio*

K₀

Clay, Saturated

0.40 - 0.50

0.67 - 1.00

Clay, Unsaturated

0.10 - 0.30

0.11 - 0.42

Sandy Clay

0.20 - 0.30

0.25 - 0.42

Silt

0.30 - 0.35

0.42 - 0.54

Dense

Coarse

0.20 - 0.40

0.25 - 0.67

(void ratio 0.4 - 0.7)

Fine-grained

0.15

0.18

(void ratio 0.4 - 0.7)

0.25

0.33

Rock

0.10 - 0.40

0.11 - 0.67