Question
Download Solution PDFFor a dense sandy soil, the value of N is:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept
A standard penetration test (SPT) is conducted in 3 stages having 150 mm penetration each. The number of blows for the first 150 mm is ignored and the number of blows in the last 300 mm penetration is noted and called Observed SPT number (N0)
The observed SPT number (N0) is corrected for
a) Overburden pressure
b) Dilatancy or Water table Correction
These Corrections are applied in sequence. It means the corrected value for overburden pressure is further corrected for dilatancy.
The final corrected SPT values of sandy soil are tabulated:
|
SPT values |
Relative Density (or) Consistency |
ϕ (°) |
|
0 - 4 |
Very loose |
< 30° |
|
5 - 10 |
Loose |
30 -35° |
|
11 - 30 |
Medium Dense |
35 – 38 |
|
31 - 50 |
Dense |
38 – 41° |
|
> 50 |
Very Dense |
41 – 44° |
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