GEOGRID AS A SOIL REINFORCEMENT

PRESENTED BY : - PRATYUSHA BANDYOPADHYAY CIVIL-204 CALCUTTA INSTITUTE

OF ENGINEERING AND MANAGEMENT GUIDED BY : - SSI SIR

INTRODUCTIONGeogrids are nothing but

the open structures formed by bonding polymer strips at their cross point. Commonly made of polymer materials, the major function of the geogrids is in the area of reinforcement to resist the tensile force.

HISTORICAL EVOLUTION The first and original geogrids ( called unitized or

homogeneous types) were invented by Dr. Frank Brian Mercer in the United Kingdom at Nelton Ltd. and were brought in 1982 to North America by the Tensar Corporation.

The second category of geogrids are more flexible geogrids using bundles of polyethylene-coated polyester fibres were first developed by ICI Linear Composites LTD. in the United Kingdom around 1980.

The third category of geogrids are made by laser or ultrasonically bonding together polyester or polypropylene rods in a grid like pattern.

OF ROADWAY BASES

GEOGRIDS USED AS REINFORCEMENT

TYPES OF GEOGRID

WOVEN NONWOVEN

MICRO ONE-WAY BIAXIAL MULTI LAYERED

WELDED-STRIP

TYPES OF GEOGRIDS

COMPOSITION

1. POLYESTER

2. POLY VINYL ALCHOHOL

3. POLY VINYL CHLORIDE

4. POLY PROPYLENE

INSTALLATION GUIDELINES 1. MATERIAL IDENTIFICATION

2. MATERIAL HANDLING

3. GEOGRID PLACEMENT

4. PLACEMENT OF FILLING MATERIAL

APPLICATIONS OF GEOGRIDS

1. RETAINING WALLS 2. BRIDGE/ RAILWAY ABUTMENTS 3. REINFORCED SOIL SLOPES 4. REINFORCED FOUNDATIONS OVER

PILES 5. REINFORCED EMBANKMENTS

OVER SOFT FOUNDATIONS

GEOGRID REINFORCEMENT

ADVANTAGES 1. It is cost saving material. 2. It increases construction

speed. 3. Proper reinforcement is

achieved. 4. Improved quality.

REFERENCES 1. http://en.wikipedia.org/wiki/Geogrid 2.  Müller, W. W.; Saathoff, F. (2015). "Geosynthetics

in geoenvironmental engineering". Science and Technology of Advanced Materials 16 (3): 034605. doi:10.1088/1468-6996/16/3/034605.  edit

3.  Ward, I. M. (1984) “The Orientation of Polymers to Produce High Performance Materials” Proceedings of the Symposium on Polymer Grid Reinforcement in Civil Engineering,Institution of Civil Engineers, UK.

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