GROUND-IMPROVEMENT - PowerPoint Presentation, Civil Engineering Notes | EduRev

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: GROUND-IMPROVEMENT - PowerPoint Presentation, Civil Engineering Notes | EduRev

 Page 1


GROUND 
IMPROVEMENT 
NPTEL Course 
Prof. G L Sivakumar Babu
Department of Civil Engineering
Indian Institute of Science
Bangalore 560012
Email: gls@civil.iisc.ernet.in
Lecture  10
Page 2


GROUND 
IMPROVEMENT 
NPTEL Course 
Prof. G L Sivakumar Babu
Department of Civil Engineering
Indian Institute of Science
Bangalore 560012
Email: gls@civil.iisc.ernet.in
Lecture  10
When highly compressible, normally consolidated
clayey soil layers lie at limited/large depths, large
consolidation settlements are expected as the result of
the loads from large buildings, highway embankments,
or earth dams etc. Pre-compression and provision of
vertical drains in soft soil may be used to minimize post-
construction settlement.
Preloading and vertical drains
Page 3


GROUND 
IMPROVEMENT 
NPTEL Course 
Prof. G L Sivakumar Babu
Department of Civil Engineering
Indian Institute of Science
Bangalore 560012
Email: gls@civil.iisc.ernet.in
Lecture  10
When highly compressible, normally consolidated
clayey soil layers lie at limited/large depths, large
consolidation settlements are expected as the result of
the loads from large buildings, highway embankments,
or earth dams etc. Pre-compression and provision of
vertical drains in soft soil may be used to minimize post-
construction settlement.
Preloading and vertical drains
This approach has resulted in a number of
techniques involving
•Pre-compression or Pre-loading
•Sand drains
•Pre-fabricated Vertical Drains
•Vacuum consolidation
•High Vacuum Densification Method (HVDM)
Page 4


GROUND 
IMPROVEMENT 
NPTEL Course 
Prof. G L Sivakumar Babu
Department of Civil Engineering
Indian Institute of Science
Bangalore 560012
Email: gls@civil.iisc.ernet.in
Lecture  10
When highly compressible, normally consolidated
clayey soil layers lie at limited/large depths, large
consolidation settlements are expected as the result of
the loads from large buildings, highway embankments,
or earth dams etc. Pre-compression and provision of
vertical drains in soft soil may be used to minimize post-
construction settlement.
Preloading and vertical drains
This approach has resulted in a number of
techniques involving
•Pre-compression or Pre-loading
•Sand drains
•Pre-fabricated Vertical Drains
•Vacuum consolidation
•High Vacuum Densification Method (HVDM)
Embankment on Clay Foundation
Effect of Surcharge Treatment
Without Surcharge Without Surcharge
With 
Surcharge
With 
Surcharge
Time Time
Time for Total 
Settlement Without 
Surcharge
Time for Total 
Settlement Without 
Surcharge
Time for Equivalent 
Settlement With 
Surcharge – Remove 
Surcharge at This Time
Time for Equivalent 
Settlement With 
Surcharge – Remove 
Surcharge at This Time
Settlement Settlement
Surcharge Surcharge
Clay Clay
Fill Fill
Page 5


GROUND 
IMPROVEMENT 
NPTEL Course 
Prof. G L Sivakumar Babu
Department of Civil Engineering
Indian Institute of Science
Bangalore 560012
Email: gls@civil.iisc.ernet.in
Lecture  10
When highly compressible, normally consolidated
clayey soil layers lie at limited/large depths, large
consolidation settlements are expected as the result of
the loads from large buildings, highway embankments,
or earth dams etc. Pre-compression and provision of
vertical drains in soft soil may be used to minimize post-
construction settlement.
Preloading and vertical drains
This approach has resulted in a number of
techniques involving
•Pre-compression or Pre-loading
•Sand drains
•Pre-fabricated Vertical Drains
•Vacuum consolidation
•High Vacuum Densification Method (HVDM)
Embankment on Clay Foundation
Effect of Surcharge Treatment
Without Surcharge Without Surcharge
With 
Surcharge
With 
Surcharge
Time Time
Time for Total 
Settlement Without 
Surcharge
Time for Total 
Settlement Without 
Surcharge
Time for Equivalent 
Settlement With 
Surcharge – Remove 
Surcharge at This Time
Time for Equivalent 
Settlement With 
Surcharge – Remove 
Surcharge at This Time
Settlement Settlement
Surcharge Surcharge
Clay Clay
Fill Fill
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