Standard Penetration Test (SPT), WHAT IS PROCEDURE OF STANDARD PENETRATION TEST?

Standard Penetration Test (SPT) The SPT is carried out in a borehole, while SCPT is carried out without a borehole. These tests examined the resistance of soil strata to penetration. • This is the most completely used penetrometer test and employs a split spoon sampler. The SPT is carry-out by driving a standard split spoon sampler into the ground by blows from a drop hammer of mass 64 kg drop-down760 mm. The sampler is driven 150 mm into the soil at the bottom of the borehole and the number of blows (N) essential to drive it an additional 300 mm counted. The number of blows (N) is represented by the standard penetration number.