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 |
|
