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Difference Between Soil Fabric And Soil Structure

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Vaibhav Singhania

on 25 September 2014

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Transcript of Difference Between Soil Fabric And Soil Structure

Advisor- Prof. Sarvesh Chandra
Vaibhav Singhania
11783

Yong and Warkentin (1975) :-The gradation and arrangement of soil particles, porosity, and pore size distribution, bonding agents and the specific interactions developed between particles through associated electrical forces.
Arrangement(solid particles and void spaces).
Gradation (inter-particle forces)

Soil Structure
the geometric arrangement of the constituent minerals particles, including the void space which can be observed visually or directly using optical and electron microscopic techniques. An assessment of soil fabric is required for a proper evaluation of soil structure.
Consider only geometric/spatial arrangement.
Soil Fabric
Difference Between Soil Fabric And Soil Structure
Spatial arrangement
microscopic level
flocculated
deflocculated
aggregated
Domain
clusters
macroscopic level
peds
Flocculated fabric
Edge-to-face (EF):
Edge-to-edge (EE)

DISPERSED FABRIC
AGGREGATED FABRIC
“The individual clay particles seem to always be aggregated or flocculated together in submicroscopic fabric units called
domains
. Domains then in turn group together to form
clusters
, which are large enough to be seen with a visible light microscope. Clusters group together to form peds and even groups of
peds
. Peds can be seen without a microscope, and they and other macrostructural features such as joints and fissures constitute the macrofabric system” (from Holtz and Kovacs, 1981).



Domain  Cluster Ped

PEDS TYPES
Granular
Blocky
Prismatic
Columnar
Platy
Single-grained
Massive
Granular Structure
Resembles cookie crumbs and is usually less than 0.5 cm in diameter.
Commonly found in surface horizons where roots have been growing

BLOCKY STRUCTURE
Irregular blocks that are usually 1.5 - 5.0 cm in diameter.
Can be subangular or angular blocky

Prismatic Structure
Vertical columns of soil that might be a number of cm long.
Usually found in lower horizons

Columnar Structure
Vertical columns of soil that have a salt "cap" at the top.
Found in soils of arid climates.


Platy Structure
Thin, flat plates of soil that lie horizontally.
Usually found in compacted soil

Massive Structure
Soil has no visible structure, is hard to break apart and appears in very large clods.

ARRANGEMENT OF GRANULAR SOILS.
LOOSE PACKING
DENSE PACKING
HONEY COMBED FABRIC
OTHER ATTRIBUTES OF SOIL STRUCTURES
GRADATION
CLASS
SOIL STRUCTURE AFFECT VARIOUS PROPERTY
GRADATION
The terms weak, moderate, or strong are used to describe the grade or how stable the peds are and how hard they are to brake apart.
e.g:- same types of peds can have different grades depending on the type of inter-particle forces involved for various soils.
Class of Soil Structure
The size or class of the peds is described as fine, medium, or coarse
Thank you.


Questions????
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