Meerut-Muzaffarnagar BOT (Ch: 52+250 To 131+000) Section Of NH 58 In The State Of Uttar Pradesh.Owner:
National Highways Authority of IndiaContractor:
M/s N.C.C Ltd.Consultant:
24,416 SqmWall Height:
12.6 m MaximumSoil Reinforcement:
TechGrid knitted & PVC coated polyester Geogrids with Tensile Strength Of 40 to 250 KN/mFacing:
Segmental Panel FaciaDesign Methodology:
FHWA-NHI-00-043TFIIL’s scope of work:
Detailed engineering design and drawings, supply of geogrids, supply of moulds for casting of panels, supervision of construction
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.
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.
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.
TechFab India Industries Ltd.
711/712, Embassy Centre,
Nariman Point, Mumbai – 400021
022- 2287 6218