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INTRODUCTION

We at GTI, are a global service provider of geo-synthetics, geotechnical engineering and ground improvement techniques. We offer best-suited solutions for a variety of projects ranging from roads, railways, hydraulics, mining & geo-environment sector. Various certifications held by us are a testament to our quality assurance systems that are considered industry benchmarks. Our clientele involves all major Government institutions & industry majors like L&T, Tata Projects, Vedanta.

For over a decade, we have been devoting a great deal of time and effort to bring ease and innovation in the field of Geo-synthetics. We embrace the challenges along our way and are fascinated by them and that is what has enabled us to grow as market leaders in the field of Geo-technical Engineering. Seeking exceptional solutions to unconventional problems is what drives us everyday at GTI.

OVERVIEW

The bridge is being constructed across the valley of river ljai near Noney, with the height of the final pier being 141 metres. The total length of the Noney bridge will be 703 metres.

The bridge is a part of the 111-km Jiribam-Tupul-Imphal new broad gauge line project, a national project which is set to be completed by 2022. The project also includes 45 tunnels, the longest being 10.28 km, which will be the longest railway tunnel of the northeast.

WHY US

For their ongoing site between Khongsang to Tupul, client asked Gabion Technologies India Pvt Ltd. to make site visit, observe the problems & recommend the site locations for slope protection work.

PROBLEMS OBSERVED

The excavation stability is affected by three to four systems of faults and joints. The rock is in a different state of weathering and hardness throughout the depths investigated. Very Poor percent of CR (Core Recoveries) and RQD (Rock Quality Designation) values have been observed throughout the depths investigated.

The location is unstable due to cutting & new slope failure at a 50-60-degree slope angle. There are also few locations identified with cracks and unstable soil mass.

SOLUTION PROVIDED BY US

Considering the type of structures involved and the subsoil/ rock characteristics as determined from the geotechnical investigations, Solid steel Anchors along with reinforced DT mesh and coir mat was approved in rock strata consisting of highly weathered and fractured sand stone/ silt stone strata.

Our design was vetted by IIT and slope protection treatment was executed under our expert supervision

As per the approved GFC drawing the following basic material was used:

GTI DT mesh reinforced Geo-composite 3D Geo-mat Spec H

GTI Coir mat

GTI Galvanized SN type Solid Steel Anchors

GTI PVC Drainage pipes.

GTI Semi-Perforated PVC pipes

GTI GX Non-Woven Geotextile

CONCLUSION

Slope stabilization is a topic of serious concern to the geologists and engineers all over the world, as the slope instability and erosion of soil by water and wind are major environmental hazards. GTI Slope Stabilization and Rockfall Protection is an advanced technique in which the existing soil slopes and excavations are passively reinforced by insertion of relatively slender elements - fully threaded steel bars (GTI SDA/SN Anchors/Bolts as per soil properties). The grout is provided to prevent corrosion of steel bars as well as to transfer the load efficiently. GTI geosynthetic nettings are provided over the slip surface, which support the face between the nails and also act as the bearing surface for nail plates.

Author :

Namrata Bichewar

Regional Manager - Maharashtra

Gabion Technologies India Pvt Ltd

Mobile  : +91 93115 29115

Email    : namrata@gabionindia.com