SPT is a simple tool to check for the strength/ stiffness of soil.
Number of blows to penentrate 75mm underground (total 6 segments with total length of 400mm) is measured.
The 1st set and 2nd set of readings (i.e. from 0mm to 150mm) will not be used. The total number of blows for the sampler to penetrate each 75mm is the SPT value for the soil.
The test in the 1st segment and 2nd segment will be stopped if the number of blows reaches 50. The counting of blows for other segments (for 3rd segment to 6th segment) will also be stopped if number of blows reaches 100.
Attached is a video of SPT testing procedure:
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