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歐美大地 Industry Information

Pile Dynamics- Standard Penetration Test (SPT) Analyzer

發布時間：2021-04-16 瀏覽次數：4730 來源：歐美大地

Pile Dynamics
Standard Penetration Test (SPT) Analyzer

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

Pile Dynamics- Standard Penetration Test (SPT) Analyzer

Determines energy transferred by SPT Hammers using force and velocity measurements
Offers simplified reporting and analysis options to speed testing results
Determines N Value to help improve reliability of soil strength estimates
Operates in English, SI, or Metric units

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

This instrument includes a subassembly of an SPT rod that is instrumented with two strain gage bridges and two piezoresistive accelerometers. These sensors obtain the force and velocity signals necessary for the calculation of transferred energy and transfer them to the SPT Analyzer.

The latest model of SPT Analyzer has a touch screen visible in all lighting conditions and responsive to gestures like pinch and zoom. Data analysis and reporting have been substantially updated for ease of use and faster output.

Case Study

Application in
Hong Kong-Zhuhai-Macao Bridge

The Standard Penetration Analyzer (SPT Analyzer) was using in the geological survey projects for the tunnel Island.