Relationship Between the SPT values with Angle of shearing resistance, Compactness and Relative Density

Relationship Between the SPT values with Angle of shearing resistance, Compactness and Relative Density

The relationship between the standard penetration test(SPT or N) values with Angle of shearing resistance(ɸ), compactness and relative Density are as follows:

SPT Values
(N)
CompactnessRelative DensityAngle of shearing resistance(ɸ)
0 – 4Very loose0 – 15 <28°
4 – 10Loose15 – 3528° – 30°
10 – 30Medium35 – 6530° – 36°
30 – 50Dense65 – 8536° – 41°
>50Very Dense>85> 41°

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Penetration Tests and Soil Sample Exploration – MCQ