soil_parameter

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Soil Mechanics

 

 

Engineering properties of  soil commonly used

Granular soil:

Very loose Loose Medium Dense Very dense
Relative density < 15% 15%-35% 35%-65% 65%-85% 85%-100%
Internal friction angle (deg) < 28 28-30 30-36 36-40 > 40
Dry unit weight (lb/ft3) < 90 90-100 100-110 110-120 > 120
Moist unit weight (lb/ft3) < 100 100-120 120-130 130-140 > 140
SPT No. 0-4 4-10 10-30 30-50 > 50

Cohesive Soil:

Very soft Soft Medium Stiff Very Stiff Hard
Moist unit weight (lb/ft3) < 100 100 115 120 125 > 130
Unconfined compressive strength (lb/ft2) < 500 500-1000 100-2000 2000-4000 4000-8000 > 8000
SPT No. < 2 2-4 4-8 8-16 16-32 > 32
Soil bearing capacity (lb/ft2) < 1000 1000-2000 2000-4000 4000-8000 8000-16000 > 16000