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Janbu Characteristics

Values of the Janbu modulus m and of stress exponent j (according Canadian Foundation Engineering Manual 1992)

Soil

Janbu modulus m

Stress index j

Very dense to dense till, glacial till

1000 - 300

1

Gravel

400 - 40

0.5

Dense sand

400 - 250

0.5

Medium condition sand

250 - 150

0.5

Loose sand

150 - 100

0.5

Dense silt

200 - 80

0.5

Medium condition silt

80 - 60

0.5

Loose silt

60 - 40

0.5

Hard to very stiff clay

60 - 20

0

Medium to stiff clay

20 - 10

0

Soft claye silt

10 - 5

0

Soft marine clays

20 - 5

0

Organic clays

20 - 5

0

Peats

5 - 1

0