SOIL IMROVEMENT BY USING JUTE GEOTEXTILE

Presented By- Vinod kumar

WHAT IS JUTE GEOTEXTILE

Jute Geotextiles (JGT) is a natural variant of man-made geotextiles loosely called ‘Geo-synthetics’.

Jute geotextiles (JGT) has emerged as a strong alternative to synthetic geotextiles for many civil engineering applications.

JUTE PLANTS

JUTE FIBRES

ADVANTAGES OF JUTE GEOTEXTILE

Abundant quantity ( INDIA is producing 20lakh m/t of jute per year ).

Great moisture retention capability.Ease of installation.Bio-degradable properties.Lower cost compare to synthetic geotextile.High initial tensile strength.

APPLICATION AREAS OF JGT

Rural road pavement construction.Reinforcement of soil.Control of railway track settlement.Slope stabilization.Protection of river banks, seashores etc.

Pavement construction

Slope stabilization

WHAT DO YOU MEAN BY SOIL STABILIZATION

Soil stabilization is a way of improving the weight bearing capabilities and performance of in-situ sub-soils, sands, and other waste materials in order to strengthen road surfaces.

SOIL STABILIZATION

Soil modification:

Improvement of soil behavior.

Soil stabilization:

Increases strength and structural values.

METHODS OF SOIL IMPROVEMENT Mechanical Stabilization. Chemical Stabilization. Bitumen Stabilization. Cement Stabilization. Lime Stabilization. Stabilization By Grouting. Sand Stabilization.

OBJECTIVE OF USING JGT FOR SOIL IMPROVEMENT

To study the influence of jute geotextile on California bearing ratio.

To study the effect of JGT on Water content, void ratio and compression index

To study the effect of geotextile as a arrests migrating of soil particle and allows water to permeate across It.

To study the strengthening of soil of low bearing capacity.

TECHNICAL FUNCTION Checks subsidence of A pavement by separating and preventing intermixing

of the soft subgrade and the harder sub-base. May control reflective cracking of pavements. Provides effective drainage system. Enhances strength and stability of high road embankment built with

materials of uncertain behaviour. Highly water absorbent; absorbs water about 5 times its dry weight. Slopes of embankments with problematic soil may be stabilized by applying

jute geotextile.

CASE STUDYAPPLICATION IN KAKINADA PORT AREA

Jute geotextile was used to strengthen a weak subgrade in Kakinada port area.

Geotextiles are particularly effective where roads are constructed over weak subgrade soils, having CBR value less than 2.0.

Unpaved roads, in particular, are subjected to severe rutting and loss of aggregate, resulting in heavy maintenance cost.

LAYING OF JUTE-REINFORCED PAVEMENT

A test section, 360m long, 21.6m wide. On either side of the road, lm deep trenches were excavated to a width of 1.2m to anchor the jute geotextiles.

Rolls of jute geotextiles were sewn to make a width of 28m with an overlap of 150mm.

The jute geotextile was spread over the road and the trench.

Trenches were backfilled with the clay excavated for the formation of trenches.

Sand was laid on the jute geotextile and compacted with smooth-wheeled rollers. Thickness of compacted sand bed was 1.2m. This constituted the base course.

A layer of compacted gravel was placed on the sand layer to a compacted thickness of 100mm.

Laying of JGT

Plan showing the location of test section

INDEX PROPERTIES OF SOIL

EFFECT ON WATER CONTENT

The high initial water content of the soil indicated that the soil was very soft.

Water content decreased after the laying of geotextiles over a period of time, indicating the increase in the effective stress.

EFFECT ON DRY DENSITY

EFFECT ON PROGRESS OF CONSOLIDATION

EFFECT ON CBR VALUE

CROSS-SECTION OF PAVEMENT IMPROVED WITH JUTE GEOTEXTILE

Finished road

CONCLUSION

There is significant improvement in the CBR value of soil reinforced with Jute Geotextile.

Water content, void ratio and compression index decreased. Jute geotextile is very effective in weak subgrade soils in

reducing their compressibility and increasing their strength. In the present case, an unpaved road laid on the reinforced soil

is still giving good service even after a lapse of 7 years.

REFERENCES

Jute Geotextile Application In Kakinada Port Area By Ajjarapu Sreerama Rao.

Improvement in CBR Value of Soil Reinforced with Jute Geotextile Layers By H. P. SINGH.

Improvement In CBR Value Of Soil Reinforced With Jute Fibre By H. P. Singh1, M. Bagra2,