The International Information Center for Geotechnical Engineers

Keller and Hayward Baker have acquired Moretrench, a contractor operating predominantly along the east coast of the US with a strong heritage of complex geotechnical projects and industrial services.

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Thursday, 19 April 2018 12:26

Electro-mechanical TRITECH machines for triaxial tests Featured

WYKEHAM FARRANCE’s electro-mechanical TRITECH machines are the original high-performance load frames for triaxial tests.

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Wednesday, 18 April 2018 14:04

Meet Becker Penetration Test Software (NovoBPT) Featured

NovoBPT is designed for correcting raw BPT blow counts (Nb) and converting them to SPT blow counts (N60).

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Tuesday, 17 April 2018 09:23

TransEd Valley Line LRT Project Featured

Geocomp monitored construction activity in TransEd Valley Line LRT.

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For several days, landslides keep evolving near Kryopigi village in Preveza, Greece.

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Monday, 16 April 2018 17:28

Soil and Asphalt testing with HM-5170 Featured

The HM-5170 Load Frame has been designed for those who do CBR soil testing and Marshall asphalt testing in their lab.

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SPT Energy Calibration consists of measuring the energy transferred by the Standard Penetration Test (SPT) hammer to the SPT rod. GRL Engineers take these measurements with the Pile Driving Analyzer® (PDA) and using an SPT rod instrumented with strain gages and accelerometers. GRL Engineers may also estimate soil setup by conducting a torque test on the instrumented SPT rod.

The Standard Penetration Test (SPT) is a widely used geotechnical test used to estimate soil strength. A 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 300mm (12 inches) 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.

The American Society for Testing and Materials (ASTM) recommends 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 resulting in the N60 value. This compensates for widely variable efficiencies from different SPT hammer types and therefore improves the reliability of the estimates obtained from the test.

 

Source: GRL Engineers

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Did you know that the Engineering Standards feature enables you to set up these standards and quickly check compliance? 

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Friday, 06 April 2018 07:03

Humboldt's HS-5001EZ Nuclear Gauge is all about Easy. Featured

Humboldt’s HS-5001EZ Moisture/Density Gauge is easy to operate, easy to power and easy to service.

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Wednesday, 04 April 2018 15:36

GeoWorld reached 8,000 registered members! Featured

We are pleased to announce that GeoWorld, the biggest online professional networking site for geotechnical engineers and associated fields, has now reached 8,000+ active members listed from the worldwide community.

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