Question
Download Solution PDFChoose the correct consistency type for the soil with the following description:
1. Consistency Index = 87%
2. Unconfined compressive strength = 150 kN/m2
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Consistency Index: It is defined as a ratio of the difference between the liquid limit and the natural water content of the soil to the plasticity index.
\({I_c} = \frac{{{w_{L - W}}}}{{{I_p}}}\)
Where,
wL = water content at liquid limit
w = Natural water content
Ip = Platicity index
|
Consistency |
Description |
Ic |
|
Liquid |
Liquid |
< 0 |
|
Plastic |
Very soft |
0-0.25 |
|
Soft |
0.25-0.5 |
|
|
Medium stiff |
0.5-0.75 |
|
|
Stiff |
0.75-1.00 |
|
|
Semi-solid |
Very stiff or hard |
> 1 |
|
Solid |
Hard or very hard |
> 1 |
Standard penetration test also gives an idea about the unconfined compressive strength of clayey soil.
|
N – Values |
Unconfined Compressive Strength (KPa or kN/sqm) |
Consistency |
|
< 2 |
< 25 |
Very Soft |
|
2 – 4 |
25 – 50 |
Soft |
|
4 – 8 |
50 – 100 |
Medium |
|
8 – 16 |
100 – 200 |
Stiff |
|
16 – 32 |
200 – 400 |
Very Stiff |
|
> 32 |
> 400 |
Hard |
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