This document provides information on reinforced earth walls, including their components and construction methodology. It discusses that reinforced earth walls combine earth and linear reinforcing strips to bear large tensile stresses. The key components are reinforcing elements, soil backfill (which can be replaced with fly ash), and a facing element. Geogrids are used as reinforcements and provide strength in tension, while fly ash or soil in the backfill provides compression strength. The document also outlines design considerations around drainage, joint materials, and stability checks for these types of walls.
Reinforced earth is a combination of earth and linear reinforcing strips that are capable of bearing large tensile stresses.
The reinforcement provided by these strips enable the mass to resist the tension in a way which the earth alone could not. The source of this resistance to tension is the internal friction of soil, because the stresses that are created within the mass are transferred from soil to the reinforcement strips by friction.
Vibro replacement stone columns are a ground improvement technique to improve the load bearing capacity and reduce the settlement of the soil. On many occasions, it is noted that the local soil is, by nature, unable to bear the proposed structure, so the use of ground improvement techniques may be necessary. Use of stone columns is one such technique. The stone column consists of crushed coarse aggregates of various sizes. The ratio in which the stones of different sizes will be mixed is decided by design criteria
Reinforced earth is a combination of earth and linear reinforcing strips that are capable of bearing large tensile stresses.
The reinforcement provided by these strips enable the mass to resist the tension in a way which the earth alone could not. The source of this resistance to tension is the internal friction of soil, because the stresses that are created within the mass are transferred from soil to the reinforcement strips by friction.
Vibro replacement stone columns are a ground improvement technique to improve the load bearing capacity and reduce the settlement of the soil. On many occasions, it is noted that the local soil is, by nature, unable to bear the proposed structure, so the use of ground improvement techniques may be necessary. Use of stone columns is one such technique. The stone column consists of crushed coarse aggregates of various sizes. The ratio in which the stones of different sizes will be mixed is decided by design criteria
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
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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
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Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
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Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
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2. Objective:
Our objective is to do a brief study on
reinforced earth walls and its components and
we are studying about the replacement of soil as
a backfill by fly Ash and steel reinforcement by
Geogrids
To explain in brief about the construction
methodology of Reinforced Earth Wall.
3. Reinforced earth wall is a combination of earth and linear
reinforcing strips that are capable of bearing large tensile
stresses.
Soil :- strong in compression.
Reinforcement:-strong in tension.
Ancient reinforcement:-tree branches , roots of vegetation , tree
trunks , straw , bamboo etc.,
Modern reinforcement:-Steel ,Geosynthetics, Concrete , Glass
fibre , Wood , Rubber , Aluminium.
What is a reinforced earth wall?
4.
5.
6. Components of Reinforced Earth wall
1.Reinforcing element
2.Soil backfill(fly ash)
3.Facing element
7. REINFORCEMENT:
A Variety of materials can be used as reinforcing material.
Those that have been used successfully include steel,
concrete, glass fibre, wood, rubber, aluminium &
Geosynthetics.
Reinforcement may take the form of strips, grids, anchors
and steel material, chain planks, ropes, vegetation and
combinations of these or other materials forms.
We are using geogrids as reinforcement . These geogrids
should be flexible having high modulus of elasticity not
susceptible to creep
9. BACKFILL:
The fill material for reinforced earth structures shall be
preferably cohesionless and it should have an angle of on
interface friction between the compacted fill and the
reinforcing element of not less then 30◦ measured in
accordance with IS 13326 part 1
The soil should have properties such that the salts in the
soil should not react chemically and electrically with the
reinforcing strips
Fly ash confirming to IRC:SP-58 Can be used as reinforced
as well as retained fill
The quality of fly ash should be controlled through
periodical checks to ensure consistency and compliance to
specifications
10.
11. FACING ELEMENTS:
Facings are selected to retain filled material,
prevent local slumping and corrosion of steeply
sloping faces , and to suit environmental
requirements
The facing is usually of ;
Reinforced concrete slabs
Plain cement concrete forum fill hollow block
(precast)
13. DRAINAGE:
If the embankment becomes waterlogged and pore water
pressures increases, the magnitude of the tensile forces
included in the grid reinforcement also increases pore water
pressures can be controlled by providing the drainage layers
at the back of the reinforced zones
A drainage bay of 600mm min width is usually provided at
back of the facing is commonly used
15. JOINT MATERIALS :
Rubber or wooden bearing pads are used
for horizontal joints so that there is no
concrete to concrete contact between the
panels and to avoid the chipping of
concrete .
Filter cloth of geotextiles are used for
horizontal and vertical joints in the interior
side of the panels such that the interior fill
may not come out of the joints .
18. In the reinforced earth wall two type of stability checked:
External stability :
It consider the reinforced structure as whole and check the
stability for sliding, overturning, bearing/tilt and slip by
considering the effects of dead loads, other loads (live load,
dynamic load etc.) and forces acting on the structure.
Internal stability:
It cover internal mechanism ( tension and pull out failure) such as
shear within the structure , arrangement and behavior of the
reinforcement and backfill. It checks the stability for each
reinforcement layers and stability of wedges within the reinforced
fill
Design of Reinforced Earth Retaining Wall
19. WORK CARRIED OUT SO FAR:
Visited the flyover near NHPC Faridabad Delhi-Agra 6 lane
Gathered information about reinforced earth walls on web.
We have concentrated only on the basic concepts.
20. RESULTS:-
Reinforced earth walls have evolved as viable technique and contributed to
infrastructure in
Terms of speed , ease of construction , economy , aesthetics etc.
It is a technology that needs to be understood well in terms of its response,
construction features etc.
Do not require experienced craftsmen with special skills for construction.
Require little site preparation.
Need little space in front of the structure for construction operations.
Do not need rigid, unyielding foundation support, because reinforced or
mu1tianchored structures are tolerant to deformations.