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Foundation Engineering

Standard Penetration Test

The observed ...

Question

The observed N - value from a standard penetration test conducted in saturated sandy strata is 30; the N-value corrected for dilatancy may be taken as

A

18

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B

23

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C

28

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D

36

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Solution

The correct option is B 23
23

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Q. The observed N - value from a standard penetration test conducted in saturated sandy strata is 30 ; the N- value corrected for dilatancy may be taken as

Q. The number of blows observed in a standard penetration Test (SPT) for different penetrations depths are given as follows
penetration of sampler number of blows

0 - 150	6
150 - 300	8
300 - 450	10

The observed N value is

Q. In a soil investigation work at a site, Standard penetration test (SPT) was conducted at every 1.5m interval up to 30m depth. At 3 m depth, the observed number of hammer blows for three successive 150 mm penetration were 8, 6 and 9, respectively. The SPT N-value at 3 m depth, is

Q. During the surface investigations for design of foundation, a standard penetration test was conducted at 4.5 m below the ground surface. The record of number of blows is given below

\begin{matrix} Penetration depth(cm) & Number of blows 0 - 7.5 & 3 7.5 - 15 & 3 15 - 22.5 & 6 22.5 - 30 & 6 30 - 37.5 & 8 37.5 - 45 & 7 \end{matrix}

Assuming the water table at ground level, soil as fine sand and correction factor for overburden as 1.0, the corrected N value for the soil would be

Q. If the actual observed value of standard penetration resistance, N, is greater than 15 in a fine sand layer below water table, then the equivalent penetration resistance will be

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