SOIL MECHANICS AND
FOUNDATION INFORMATION
|
Consistency |
FIELD IDETIFICATIONS |
UNCONFIEND COMPRESSIUE ST. MG/CM2 |
|
Very soft |
Easily penetrated several inches by fist |
0.27 |
|
Soft |
Easily penetrated several inches by thumb |
0.27-0.54 |
|
Medium |
Can be penetrated several inches by thumb with moderate effort. |
0.54-1.08 |
|
Stiff |
Readily indented by thumb but penetrated only with great effort |
1.08-2.16 |
|
Very stiff |
Readily indented by thumb nail |
2.16-4.32 |
|
Hard |
Indented with difficulty by thumb nail |
>4.32 |
Penetration resistance & soil properties on basis of the standard penetration test.
|
No of blows per 30 CM(N) |
Relative density DR |
|
0-4 4-10 10-30 30-50 over 50 |
Very loose Loose Medium Dense Very dense |
PROPERTIES OF Cohesionless soils
|
Type of soil |
Angle of Internal friction |
Unit WT& |
|
|
Dry |
Moist |
||
|
Gravel common |
35-45 |
1.75-2.20 |
- |
|
Shingle loose |
40 |
1.80 |
- |
|
Sandy compact |
40-45 |
2.05 |
- |
|
Loose |
35-40 |
1.90 |
- |
|
Sand : fine Dry |
30-35 |
1.60 |
- |
|
Wet |
00-30 |
1.85-1.95 |
- |
|
Well graded compact |
40-45 |
1.75-1.95 |
1.95-2.2 |
|
Loose |
35-40 |
1.60-1.75 |
1.75-1.90 |
|
Sand : uniform Fine or silty compact Loose |
35-40 30-35 |
1.60-1.75 1.50-1.60 |
1.7 1.6 |
|
Coarse or Medium compact |
35-40 |
1.60-1.75 |
1.9 |
|
Loose |
30-35 |
1.5-1.60 |
1.7 |
|
Crushed rock Granite Basalt Sandstone Broken chalk |
35-40 35-40 35-40 35-40 |
1.60-2.10 1.75-2.25 1.30-1.90 0.95-1.30 |
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