Standard Penetration Test (SPT)

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Description:

This test (IS: 2131 – 1981) is performed in a clean hole, 100 to 150 mm in diameter.
A casing or drilling mud is used to support the sides of the hole.

This test is most commonly used for cohesionless soil which can not be easily sampled.
Useful for determining the relative density and the angle of shear resistance.
It can also be used to determine the unconfined compressive strength of cohesive soil.
The test shall be made,…
At every change in the stratum
At intervals not more than 1.5 m

If the number of blows for 150mm exceeds 50 it is taken as a refusal and the test is discontinuous


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