Standard penetration testing


The Standard Penetration Test (SPT)


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Standard penetration testing

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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.

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Standard penetration testing
Standard penetration testing

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7 Feb The Standard Penetration test (SPT) is a common in situ testing method used to determine the geotechnical engineering properties of.

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Description:The number of blows for that mm becomes the N-value. The number of blows recorded for the first mm is disregarded. Use of the thin wall tube sampler Practice D may result in less disturbance in soft soils. The process of driving the sampler will cause disturbance of the soil and change the engineering properties. Note 1—The reliability of data and interpretations generated by this practice is dependent on the competence of the personnel performing it and the suitability of the equipment and facilities used. The operation entails the operator counting the number of hammer strikes it takes to drive the sample tube 6 inches at a time. In certain circumstances, it can be useful to continue driving the sampler beyond the distance specified, adding further drilling rods as necessary.

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