Civil Engineering MCQAE Level Civil Engineering
In Standard Penetration Test (SPT), the N-value is defined as the number of blows required to drive the split spoon sampler:
Soil MechanicsSPT N-valueMEDIUM
Choose the correct answer
A
A total depth of 450 mm
B
A seating depth of 150 mm
C
The last 300 mm (after 150 mm seating)
D
A total depth of 300 mm
Correct Answer
C. The last 300 mm (after 150 mm seating)
Why is this the answer?
SPT: The sampler is first driven 150 mm (seating drive). The blow count for the next 300 mm (in two 150 mm increments) is the N-value. The seating drive blows are discarded.
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