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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 2021

Holiday calendar in 2021

Date Number of days off 2020  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 2021

    Holiday calendar in 2021

    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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Slide01 "Degree of saturation" of a soil sample is not an index test but derived from its natural moisture content, void ratio and specific gravity. Degree of saturation is denoted by Sr which has the unit of percent describes the degree of water filling in voids of a soil mass.

In practical, degree of saturation varies in the range of 0% ~ 100% and never reaches the margin of 0% or 100%. However, some of geotechnical laboratories in Vietnam suppose that the value of saturation degree is higher than 100% for organic soils (!)

In a soil mass there are usually two components: solid soil particles and pores (voids) which contain air and water. Because the air volume is neglectable and therefore there are two components only (solid particles and water) in the soil mass.

If there is no water in voids, the soil mass is completely dry and Sr = 0%. In contrast, if all voids are filled up by water then the soil mass is completely saturated and Sr = 100%. In the case of Sr > 100%, how could the water be held in the soil mass ???

Completely dry soil has two phases only: solid and air (after K.H. Head, 2006)
DrySoil_En
 
Completely saturated soil has two phases only: solid and water (after K.H. Head, 2006)
SatSoil_En

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