Standard penetration test soil
The test is carried out within a borehole. The results can be used to determine the relative density, bearing capacity, and settlement of granular soil. The results can also be used to correlate the approximate strength of cohesive soil. In cohesive soil the test involves driving a 50mm diameter split-barrel spoon sample tube into the ground to recover a disturbed sample. In granular soil the split-barrel is replaced by a solid 60 degree cone. The split-barrel or solid cone is driven using a sliding hammer with a mass of
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Standard Penetration Test (SPT)-Procedure,Precautions, Advantages
Standard penetration test
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Standard Penetration Testing (SPT)
Contents [ hide show ]. Standard Penetration Test SPT is a simple and low-cost testing procedure widely used in geotechnical investigation to determine the relative density and angle of shearing resistance of cohesionless soils and also the strength of stiff cohesive soils. For this test, a borehole has to be drilled to the desired sampling depth. The split-spoon sampler that is attached to the drill rod is placed at the testing point.
The standard penetration test SPT is an in-situ dynamic penetration test designed to provide information on the geotechnical engineering properties of soil. This test is the most frequently used subsurface exploration drilling test performed worldwide. The test provides samples for identification purposes and provides a measure of penetration resistance which can be used for geotechnical design purposes. Many local and widely published international correlations which relate blow count, or N-value, to the engineering properties of soils are available for geotechnical engineering purposes. The test uses a thick-walled sample tube, with an outside diameter of
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