Standard penetration test data

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This test is still used because of it's simplicity and low cost. It can provide useful information in very specific types of soil conditions, but is not as accurate as a Cone Penetration Test. Here's more information about this basic soil testing procedure. For this test, a sample tube, which is thick walled to endure the test environment is placed at the bottom of a borehole.
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Standard penetration test

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Standard Penetration Test (SPT) of Soil - Procedure, Tools, Precautions.

The Standard Penetration Test SPT is most popular and economical test to determine the surface information, both on land and offshore. The number or blows required for 12 inches penetration resistance of the soil. The consistency of clayey soils can often be estimated from this test. When a borehole is extended to a predetermined depth, the drill tools are removed, and the sampler split spoon is lowered to the bottom of the borehole. The sampler is driven into the soil, by hammer blows to the top of the drill rod. The standard weight of the hammer is lbs. The number of blows required for the last two intervals are added to give the standard penetration number at that depth.
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CPT University

Need Geotechnical Equipment? Request a quote. Pricing information and quote request on Geotechgate.
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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.
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