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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 2023

Holiday calendar in 2023

Date Number of days off 2024  New Year's...

Upcoming Events

Upcoming Events

Upcoming events Date Location The 21st Southeast Asian...

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...

  • List of Standards

    List of Standards

    July 18, 2011
  • Holiday calendar in 2023

    Holiday calendar in 2023

    October 2, 2011
  • Upcoming Events

    Upcoming Events

    December 3, 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

After reviewing a geotechnical investigation report for a solar power project at Binh Thuan province, the feeling is... 'breaking out in a cold sweat' thinking There are many strange geotechnical terms being used in that report.

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.

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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.