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List of Standards

List of Standards

The list of standards (ASTM, BS and TCVN) which are commonly used in...

Holiday calendar in 2018

Holiday calendar in 2018

Date Number of days off 2017  New Year's...

Standard Penetration Test

Standard Penetration Test

Standard penetration test (SPT) is one of the most common in situ testing...

Precision or Accuracy ???

Precision or Accuracy ???

When working with technical documents, readers are often deal with specific...

Bulk Density

Bulk Density

1. Definition: A bulk density of a soil sample is defined as a mass per...

Compaction Test

Compaction Test

1. Definition: The bulk density or dry density of soils is not a constant...

Warning on Webpage Content Stealing

Warning on Webpage Content Stealing

On February 27, 2014, flatGEO Consulting Co. accessed to a webpage on...

Datalogger for Oedometers

Datalogger for Oedometers

After a four-month-trial period, flatGEO has finished a datalogger system for...

  • List of Standards

    List of Standards

    July 18, 2011
  • Holiday calendar in 2018

    Holiday calendar in 2018

    October 2, 2011
  • Standard Penetration Test

    Standard Penetration Test

    December 12, 2011
  • Precision or Accuracy ???

    Precision or Accuracy ???

    January 7, 2012
  • Bulk Density

    Bulk Density

    February 20, 2012
  • Compaction Test

    Compaction Test

    March 7, 2012
  • Warning on Webpage Content Stealing

    Warning on Webpage Content Stealing

    February 27, 2014
  • Datalogger for Oedometers

    Datalogger for Oedometers

    July 21, 2015
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Accuracy or precision ?When working with technical documents, readers are often deal with specific terms “accuracy” and “precision”. The question is if these terms have the same meanings?

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Brief introduction:

  • This article reviews the history of the method of statistical analysis for soil testing data and evaluates the reliability of the Vietnamese standard TCVN 9153:2012.
  • Unfortunately, the printing version of TCVN 9153:2012 has many typos. Even worse, some of these typos could make the reverse meaning. Therefore, the readers should refer to handbooks on statistics to get correct concepts and formulae whenever working on TCVN 9153:2012.

"Symbols and definitions used in geotechnical engineering" is quoted from "Lexicon in 8 languages" (the fifth edition) published in 1981 by International Society for Soil Mechanics and Geotechnical Engineering.

confused (If your web browser does not display properly mathematical formulae, please refer to How to change renderers in MathJax)


1. General

Slide01 Each natural object is modeled via properties. To avoid the misunderstanding during communication, scientists often use terms (short names) for properties instead of their full names. Those terms are standardized in the national or global scale. However, in Vietnamese reports on geotechnical investigation, terms and their symbols and measurement units are not used consistently.

Typing degree symbol One of the most important properties in the summary of soil mechanic tests is the internal friction angle. However, the person who is in charge of data input has trouble typing a degree symbol in Excel.