Geosynthetics in Flexible Pavements and Carbon Foot Analysis Notes | EduRev

: Geosynthetics in Flexible Pavements and Carbon Foot Analysis Notes | EduRev

 Page 1


Geosynthetics in Flexible Pavements Geosynthetics in Flexible Pavements 
and Carbon Foot Print Analysis
Prof. K. Rajagopal
Department of Civil Engineering Department of Civil Engineering, 
IIT Madras, Chennai, India 600036
This work was part of M.Tech. projects of Avinash
Unni, S. Chandramouli, K. Iniyan & Lt.Col. Tushar Vig
Thanks are also due to Prof. A. Veeraragavan and Dr.
Sivakumar Palaniappan
Page 2


Geosynthetics in Flexible Pavements Geosynthetics in Flexible Pavements 
and Carbon Foot Print Analysis
Prof. K. Rajagopal
Department of Civil Engineering Department of Civil Engineering, 
IIT Madras, Chennai, India 600036
This work was part of M.Tech. projects of Avinash
Unni, S. Chandramouli, K. Iniyan & Lt.Col. Tushar Vig
Thanks are also due to Prof. A. Veeraragavan and Dr.
Sivakumar Palaniappan
Outline
• Field and Laboratory tests performed to 
assess the influence of geocell layer assess the influence of geocell layer
• Equivalent modulus of the geocell layer 
evaluated evaluated
• Influence on pavement thickness 
evaluated through stress analysis evaluated through stress analysis 
programs
• Carbon foot print analysis of construction • Carbon foot print analysis of construction 
activities
Page 3


Geosynthetics in Flexible Pavements Geosynthetics in Flexible Pavements 
and Carbon Foot Print Analysis
Prof. K. Rajagopal
Department of Civil Engineering Department of Civil Engineering, 
IIT Madras, Chennai, India 600036
This work was part of M.Tech. projects of Avinash
Unni, S. Chandramouli, K. Iniyan & Lt.Col. Tushar Vig
Thanks are also due to Prof. A. Veeraragavan and Dr.
Sivakumar Palaniappan
Outline
• Field and Laboratory tests performed to 
assess the influence of geocell layer assess the influence of geocell layer
• Equivalent modulus of the geocell layer 
evaluated evaluated
• Influence on pavement thickness 
evaluated through stress analysis evaluated through stress analysis 
programs
• Carbon foot print analysis of construction • Carbon foot print analysis of construction 
activities
Back ground (GEOCELL)
• Expandable 3-d permeable,
honeycomb or web structure, y ,
made of strips of polymer
• Invented by the US army corps
of engineers in the 1970’s to of engineers in the 1970’s to
construct temporary roads for
heavy military vehicles over
3D Cellular confinement system       
(GEOCELL)
weak soils
• Extensively used by US Army
during the Gulf war for effective during the Gulf war for effective
moving of military
vehicles/trucks over the desert
sand.
Originally developed by US 
Army Corps of Engineers 
(1979)
Page 4


Geosynthetics in Flexible Pavements Geosynthetics in Flexible Pavements 
and Carbon Foot Print Analysis
Prof. K. Rajagopal
Department of Civil Engineering Department of Civil Engineering, 
IIT Madras, Chennai, India 600036
This work was part of M.Tech. projects of Avinash
Unni, S. Chandramouli, K. Iniyan & Lt.Col. Tushar Vig
Thanks are also due to Prof. A. Veeraragavan and Dr.
Sivakumar Palaniappan
Outline
• Field and Laboratory tests performed to 
assess the influence of geocell layer assess the influence of geocell layer
• Equivalent modulus of the geocell layer 
evaluated evaluated
• Influence on pavement thickness 
evaluated through stress analysis evaluated through stress analysis 
programs
• Carbon foot print analysis of construction • Carbon foot print analysis of construction 
activities
Back ground (GEOCELL)
• Expandable 3-d permeable,
honeycomb or web structure, y ,
made of strips of polymer
• Invented by the US army corps
of engineers in the 1970’s to of engineers in the 1970’s to
construct temporary roads for
heavy military vehicles over
3D Cellular confinement system       
(GEOCELL)
weak soils
• Extensively used by US Army
during the Gulf war for effective during the Gulf war for effective
moving of military
vehicles/trucks over the desert
sand.
Originally developed by US 
Army Corps of Engineers 
(1979)
Simultaneous Mechanisms in 3 
Dimensions
a) Unreinforced soil subjected to shear 
a. When pressure is applied on unreinforced 
weak soils, failure occurs immediately due 
to lateral flow of soil
b. When surface soil is confined by geocells, 
failure mechanism is suppressed from 
b) Pushing decrease by confinement
formation.
c. Surface pressures are transferred to 
deeper strata due to interaction.
c) Lateral stress on cell due to stress with 
in the cell
Oferand Rajagopal (2008)
Page 5


Geosynthetics in Flexible Pavements Geosynthetics in Flexible Pavements 
and Carbon Foot Print Analysis
Prof. K. Rajagopal
Department of Civil Engineering Department of Civil Engineering, 
IIT Madras, Chennai, India 600036
This work was part of M.Tech. projects of Avinash
Unni, S. Chandramouli, K. Iniyan & Lt.Col. Tushar Vig
Thanks are also due to Prof. A. Veeraragavan and Dr.
Sivakumar Palaniappan
Outline
• Field and Laboratory tests performed to 
assess the influence of geocell layer assess the influence of geocell layer
• Equivalent modulus of the geocell layer 
evaluated evaluated
• Influence on pavement thickness 
evaluated through stress analysis evaluated through stress analysis 
programs
• Carbon foot print analysis of construction • Carbon foot print analysis of construction 
activities
Back ground (GEOCELL)
• Expandable 3-d permeable,
honeycomb or web structure, y ,
made of strips of polymer
• Invented by the US army corps
of engineers in the 1970’s to of engineers in the 1970’s to
construct temporary roads for
heavy military vehicles over
3D Cellular confinement system       
(GEOCELL)
weak soils
• Extensively used by US Army
during the Gulf war for effective during the Gulf war for effective
moving of military
vehicles/trucks over the desert
sand.
Originally developed by US 
Army Corps of Engineers 
(1979)
Simultaneous Mechanisms in 3 
Dimensions
a) Unreinforced soil subjected to shear 
a. When pressure is applied on unreinforced 
weak soils, failure occurs immediately due 
to lateral flow of soil
b. When surface soil is confined by geocells, 
failure mechanism is suppressed from 
b) Pushing decrease by confinement
formation.
c. Surface pressures are transferred to 
deeper strata due to interaction.
c) Lateral stress on cell due to stress with 
in the cell
Oferand Rajagopal (2008)
Simultaneous Mechanisms in 3 Dimensions
c)Hoopstressdevelopment
The three dimensional structure confines
the infill soil, limiting lateral deformation.
Lateral expansion of the infill is restricted by
highhoopstress.
d)Passiveresistanceofneighbouringcells
e)Interfacefrictionforcedevelopedalongthecellwalls.
Because of all the above phenomena, the pressure transmitted to the
foundationsoilreduces.
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