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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



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