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What is SPT?
The Standard Penetration Test (SPT) is a
widely-employed soil exploration tool that
involves using an SPT hammer to drive a
split sampler at the bottom of a drill string
to obtain soil samples. The number of blows
required to penetrate the last 300mm (1ft) is
the “N value” which is related to soil strength
Standard for SPT in Hong Kong is BS 1377: 1990
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Pile Dynamics- Standard Penetration Test (SPT) Analyzer
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Determines energy transferred by SPT Hammers using force and velocity measurements
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Offers simplified reporting and analysis options to speed testing results
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Determines N Value to help improve reliability of soil strength estimates
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Operates in English, SI, or Metric units
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EN ISO 22486-3:2005/ASTM Compliant
The SPT Analyzer is compliant with EN ISO 22476-3:2005. ASTM D1586 recommends normalizing results from any SPT test using energy measurements.
When these tests are performed to determine the liquefaction potential of sands, ASTM D6066 not only recommends but mandates the normalization. ASTM D4633 states that the only acceptable method of determining energy for normalization of N values is by force and velocity measurements
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