A SEMINAR ON “REINFORCED EARTH & ITS

APPLICATION”

Reinforced Earth

Reinforced Earth is a composite material formed by the association of frictional soil and tension resistant elements in the form of sheets, strips, or nets of metal, synthetic fabrics or fibre reinforced plastics.

or Reinforced earth is a combination of earth and linear

reinforcing strips that are capable of bearing large tensile stresses

Reinforced earth is also called as Reinforced soil.

Reinforced Earth

Generally used in retaining walls, embankments, quay walls, underground structures.

Henri Vidal ,a French engineer ,demonstrated the concept of the “Reinforced Earth” in 1966 and later on Dr.Jones (scientist) continued it.

Objectives:- this methods are opted to improve the engineering and

mechanical properties of soil. Because of its technical superiority and

economic advantages, reinforced earth has become a widely used in the construction of earth-retaining structures.

Practical Figures of reinforced earth structures

Types of Reinforcement

Types Of Reinforcement :- Sheet reinforcement Strip reinforcement Geo-grid reinforcement

a) Uniaxial

b) Bi-axial

c) Triaxial

Sheet Reinforcement

It is be formed from metal such as galvanized steel, fabric (textile).

These are manufactured from synthetic materials such as polypropylene, polyester and glass fibres.

The thickness ranging from 0.125mm to 7.5mm

These reinforcement has high tensile strength, which can last up to 400kN/m

Sheet reinforcement

This can be constructed in two ways. They are

a)Woven made from continuous monofilament fibres.

b)Non-woven made from staple fibres.

Practical image of sheet reinforcement:

Strip Reinforcement

These are flexible linear members having greater breadth than their thickness.

Thickness usually varies from 3mm-9mm & breadth is between 40mm-120mm.

These strips can also be formed from bamboo, polymers and glass fibre reinforced plastics

Reinforced Embankments

An embankment is an artificial barrier that typically is used to hold back water or to support a roadway , railway, or canal.

These are man-made mounds mainly consist of stones , rocks, and earth.

Generally, these embankments are longer than they are in height.

Practical Image of Embankment

Reinforced Soil Wall

A vertical-walled structure formed by increasing the stability of the backfill of the retaining wall with the installation of reinforcement materials such as geogrids and steel strips into the backfill.

While designing a reinforcement soil wall, we need to consider

a)External stability

b)Internal stability

Modes of Failure’s are

Reinforced Soil Beds

A reinforced soil bed is a composite material composed of stiffer materials called ‘reinforcement ‘embedded in the soil bed .

It increases the bearing capacity, reducing the differential settlement.

My References

1) Reinforced Soil and it's Engineering Applications by Swami Saran

2)Basic & Applied Soil Mechanics by Gopala Rajan & A.S.R.Rao

3) Soil Mechanics and Foundation Engineering (Geotechnical Engineering) (English literature)

Author : K. R. Arora

THANK YOU

BY

B.VENKAT PRANAY

11B91A0113