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The Standard Penetration Test (SPT) is a popular geotechnical test used to estimate soil strength. An SPT hammer drives a split barrel sampler at the bottom of a drive rod and recovers soil samples. The number of blows required to drive the last 300 mm is the “N value”, and indicates soil strength. Several different types of SPT hammers are used to perform SPT tests, and this influences the N value. Engineers recommend standardizing the measured N value by multiplying it by the ratio between the measured energy transferred to the rod and 60% of the theoretical potential energy of the hammer. This compensates for widely variable efficiencies from different SPT hammer types and therefore improves the reliability of the geotechnical estimates of soil strength obtained from the test.

SPT Energy Calibration improves the reliability of the Standard Penetration Test.

SPT Energy Calibration consists of measuring the energy transferred by the Standard Penetration Test (SPT) hammer to the SPT rod. Pile Analysis take these measurements with the Pile Driving Analyser and using a SPT rod instrumented with strain transducers and accelerometers.

Please contact MKM to discuss your specific requirements.