Consolidation
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Transcript of Consolidation
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Consolidation Test On Cohesive Soil
Geotechnical Engineering Laboratory
Sub By: Farhad Raoofi
ASTM-D 2435
DATE: 07-04-2016
Herat, Afghanistan
Ultra Design And research Company
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Class Outlines
Consolidation
Definition & Introduction
Type of Consolidations
One – Dimensional Consolidation Test
Definitions
Procedure
Graphs and results
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Consolidation refers to the compression o
settlement that soil undergo As response of
placing loads on to the ground
These loads produce corresponding increases
in the vertical effective stress
Consolidation is a time- dependent process in
some soils it may take long time ( 100 years ? )
to achieve complete settlement.
Consolidation – Definitions
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Consolidation ( Cont. )
During consolidation pore water or the water
voids of saturated clay gets squeezed out –
reducing the volume of the clay _ hence causing
settlement called as consolidation settlement
The spring
analogy to
consolidation
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Consolidation ( Cont. )
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Types Of Consolidation
There are three types of consolidation:
Immediate consolidation; caused by elastic deformation of dry soil
or moist and saturated soil without change in moisture content
Primary consolidation; caused as a result of volume change in
saturate cohesive soils due to exclusion of water occupied the void
spaces
Secondary consolidation; occurs in saturated cohesive soils as a
result of the plastic adjustment of soil fabrics
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Two types of consolidometer ( odometer ) commonly used
Consolidation Test:
Floating – ring
Fixed ring
This lab uses fixed ring consolidometer
ASTM 2435
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Laboratory Consolidation Test
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Consolidation Test
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Laboratory Consolidation Test
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Procedure:
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Calculation:
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