Rapid urban and industrial growth demands more land for further development, to meet this demand land reclamation and utilization of unsuitable and environmentally affected lands have been taken up and converted to useful ones by adopting one or more Ground Improvement Techniques
Know the necessity of ground improvement
Understand the various ground improvement techniques available
Select design suitable ground improvement technique for existing soil conditions in the field
Rapid urban and industrial growth demands more land for further development, to meet this demand land reclamation and utilization of unsuitable and environmentally affected lands have been taken up and converted to useful ones by adopting one or more Ground Improvement Techniques
Know the necessity of ground improvement
Understand the various ground improvement techniques available
Select design suitable ground improvement technique for existing soil conditions in the field
CIVIL SEMINAR REPORT :USE OF GEOGRIDS IN FLEXIBLE PAVEMENT. Geogrids can also prevent aggregate penetration into the subgrade, depending on the ability of the geogrid to confine and prevent lateral displacement of the base/sub-base. However, the geogrid does not prevent intrusion of subgrade soils up into the base/sub-base course,...
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geosynthetic can significantly increases the safety factor, improve performance and reduce costs in comparison with conventional construction alternatives. In the case of embankments on extremely soft foundations, geosynthetics can permit constructions to take place at sites where conventional construction alternatives would be either impossible or prohibitively expensive. It have been successfully used for decades in construction of roads and railways, to fulfil almost all classical functions like separation, protection, filtration, drainage, sealing and reinforcement.
CIVIL SEMINAR REPORT :USE OF GEOGRIDS IN FLEXIBLE PAVEMENT. Geogrids can also prevent aggregate penetration into the subgrade, depending on the ability of the geogrid to confine and prevent lateral displacement of the base/sub-base. However, the geogrid does not prevent intrusion of subgrade soils up into the base/sub-base course,...
flexible pavement ppt
flexible pavement vs rigid pavement
rigid pavement
flexible pavement materials
flexible pavement design
flexible pavement of road construction
types of rigid pavements
flexible pavement construction
interesting civil engineering topics
civil engineering topics for presentation
civil seminar topics ppt
civil engineering seminar topics 2018
best seminar topics for civil engineering
seminar topics pdf
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geosynthetic can significantly increases the safety factor, improve performance and reduce costs in comparison with conventional construction alternatives. In the case of embankments on extremely soft foundations, geosynthetics can permit constructions to take place at sites where conventional construction alternatives would be either impossible or prohibitively expensive. It have been successfully used for decades in construction of roads and railways, to fulfil almost all classical functions like separation, protection, filtration, drainage, sealing and reinforcement.
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2. Geosysnthetics
Geosynthetics are the polymeric materials
used with geological materials to modify civil
engineering properties.
Therefore, the definition includes the
following;
• Polymeric materials
• Used with geological materials
• Modification of properties
3. Polymeric Materials
Geosynthetics are made of polymeric
materials like polypropylene, polyester, and
polyethylene.
Now natural synthetic materials or natural
materials are also used to manufacture
geosynthetics like jute, coir and glass fibres.
4. Type of Polymeric Geosynthetics
• Geotextiles
• Geogrids
• Geomembranes
• Geocomposites
6. Non Woven Textiles
• Non-woven geotextiles are manufactured
from either continuous filament yarn or short
staple fiber
• The bonding of fibers is done using thermal,
chemical or mechanical techniques or a
combination of these
8. Woven Geotextiles
• Woven geotextiles are woven type
manufactured using to weaving techniques
like usual clothing textiles.
• The yarn running along the length is called
warp and the perpendicular one is called
weft.
9.
10. Knitted Geotextiles
• Knitted geotextiles are manufactured by the
process of interlocking a series of loops of
yarn together using the knitting technique in
conjunction with some other method.
11. Geogrids
• Geogrids are polymeric products formed by
joining intersecting ribs having large open
spaces i.e. apertures. The directions of the ribs
are referred to as machine direction orientated
in the direction of the manufacturing process or
cross machine direction perpendicular to the
machine direction ribs.
• Geogrids are extruded and then pulled either in
one direction called as mono-oriented geogrids,
or in the two main directions known as bi-
oriented geogrids.
13. Geomembranes
• Geomembranes are synthetic membranes
made from relatively thin continuous
polymeric sheets of very low permeability
used to control fluid (or gas) migration.
14. Geocomposites
• Geocomposites are combination of various
Geosynthetics materials like Geotextile,
Geogrids and Geo-membranes bounded for
specific applications.
15. Geosynthetics
• Other types of geosynthetics are known as:
• Geonets
• Geosynthetic clay liners
• Geofoams
• Geocells
Geonet Geosynthetic clayliner Geofoam blocks Geocells
16. Principle of working of Geosynthetics
• Friction for reinforcing action
• Hydraulic flow
17. Friction
• Friction between soil and geosynthetics
– Thus soil has to be frictional soil like sand
– Geosynthetics may be of geogrids, geotextiles,
Geofoams
Uses are for roads, retaining walls,
embankments, bearing capacity
improvement
18. Hydraulic flow
• Hydraulic flow required
– filtration across the plane
– drainage along the plane
– Uses of non woven geotextiles, Geodrains
• Hydraulic flow not required
– Geomembranes
– Geotextile clay line
23. Drainage/Filtration
• Drains
– Non woven geotextiles
• Gabions
– For reinforcing action, Geogrids, for filtration and
drainage: Non woven geotextiles
• Geopipes
– Non woven geotextiles
25. Thanks for attending
Dr K M Soni, ADG (Retd.), CPWD, New Delhi
Also available on Youtube: KRISHNA MURARI Soni at
https://www.youtube.com/channel/UC_pPYxk0jI1ayqA5rO6fBOw