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Phase Diagram of Soil – Two and Three Phase Diagram For Dry, Moist and Saturated Soil

Posted on 27th July 201826th September 2023 By Malay Sautya

Phase diagram of soil 

A soil mass consists of solid particles, containing void space between them. These voids may be filled either by water or by air or both. 

Phase Diagram of Soil- Two and Three Phase Diagram For Dry, Moist and Saturated Soil

Two-Phase Diagram of Soil

The soil will behave as a two-phase system when its void space is filled by either water or air alone. Such condition is possible when the soil is either fully saturated or fully dry. 

Three-Phase Diagram of Soil

But, when the soil mass is partially saturated, its void space will be filled up by water as well as air. Under such condition, soil mass will behave a three-phase system.

This three-phase system can be easily represented by the block diagram as shown in the figure. The total volume of soil mass (V) consists of the following:

V = Vv + Vs
V = (Va  + Vw ) + Vs

Where,

  • Vv = Volume of voids in the soil = Volume of air in the soil (Va)+ Volume of water in the soil (Vw).
  • Vs = Volume of solids.

Video of Soil Phase Diagram

Read Also:

Types of Soil Samples

Field Measurement of Shear Strength of Cohesive Soil By Vane Shear Test

Laboratory compaction test (Standard Proctor compaction test)

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Contents

  • 1 Phase diagram of soil 
    • 1.1 Two-Phase Diagram of Soil
    • 1.2 Three-Phase Diagram of Soil
    • 1.3 Video of Soil Phase Diagram
    • 1.4 Share this:
    • 1.5 Related
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