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TECHGRID GEOGRID REINFORCED SOIL WALLS WITH SEGMENTAL PANEL FACING


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PROJECT DESCRIPTION
Project:

Meerut-Muzaffarnagar BOT (Ch: 52+250 To 131+000) Section Of NH 58 In The State Of Uttar Pradesh.

Owner:

National Highways Authority of India

Contractor:

M/s N.C.C Ltd.

Consultant:

M/s. BCEOM

RSRW at Meerut - Muzaffarnagar
RSRW at Meerut - Muzaffarnagar
Vehicular Under Pass -1
Vehicular Under Pass -2
SALIENT FEATURES
Wall Facing Area:

24,416 Sqm

Wall Height:

12.6 m Maximum

Soil Reinforcement:

TechGrid knitted & PVC coated polyester Geogrids with Tensile Strength Of 40 to 250 KN/m

Facing:

Segmental Panel Facia

Design Methodology:

FHWA-NHI-00-043

TFIIL’s scope of work:

Detailed engineering design and drawings, supply of geogrids, supply of moulds for casting of panels, supervision of construction

The Project:

N.C.C. Ltd has awarded the work of Reinforced Soil Retaining Wall to M/s TechFab (India) Industries Ltd. The scope of work include, design of reinforced soil wall, their approval, submission of drawings, supply of moulds and supervision at site. There was 1 ROB and two underpasses at Ch 118 and Ch 122 for reinforced soil work for approaches. The site was located on section of NH 58 (Meerut – Muzaffarnagar) in the state of Uttar Pradesh (U.P.) The wall height for the ROB ranges from 5.5m to 12.6m; for Underpass at Ch 118 wall height ranges from 2.3m to 7.0m and for Underpass at Ch 122 wall height ranges from 1.5m to 7.0m.

KEYPLAN
The Challenge:

Bearing Capacity & Settlement Analysis for the Reinforced Soil Wall were done rigorously.

Two types of strata were found below the ground level:

Brown Sandy Silt / clayey silt of low to medium plasticity

Loose / medium dense / dense brown fine / silty sand

Global Stability of the RSR Wall was checked using ReSSA 3.0 Software and found safe.

For wall facing height ≤ 6m no special ground treatment was required as per the calculations.

For wall facing heights > 6m, a compacted granular layer of 500 mm thickness was provided below the founding level of Reinforced Soil Wall.

The Solution:

After a careful evaluation of the project requirements and site conditions a geogrid reinforced soil wall with segmental panel facing was finalized as the most optimum solution.

TechGrid knitted and PVC coated polyester geogrids, manufactured by TechFab India at their state of the art ISO 9001: 2000 certified plant in Silvassa, were used as the soil reinforcement. TechGrid geogrids area manufactured from select grades of high tenacity, high molecular weight polyester yarns using an advanced weft insertion warp knitting process and coated with a specially formulated PVC plastic. The high performance characteristics of these world class geogrids enabled the walls as high as 12.6 m, to be designed safely and economically.

Table-1 shows the property of the reinforced infill, retained fill and foundation soil taken into consideration in the designs.

The design of the walls was carried out using the FHWA-NHI-00-043 guidelines and comprised checks for external, internal and global stability under static and seismic conditions. Construction of the wall was carried out under the supervision of TechFab India Industries Ltd.

The project was successfully completed in August 2010.
FOR FURTHER DETAILS

TechFab India Industries Ltd.
711/712, Embassy Centre,
Nariman Point, Mumbai – 400021

022-2287 6224/6225

022- 2287 6218

anant@techfabindia.com

www.techfabindia.com

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