Geohazards protection at new broad-gauge rail line project in Central India

The broad-gauge railway line is being constructed in the central part of India to boost transportation and regional development. Geohazards meant that rockfall protection works were required along a critical 500 m stretch, with cut slopes 33 m-80 m high. The slope comprises moderately to slightly weathered quartzite schist, with sub-parallel thick bands of garnetiferous mica schist. The cut slope has been excavated at a slope angle of around 45°, with intermediate benches at every 4.5 m height and around 2 m width to increase the stability and effectiveness of the cut slope. 

Garware Technical Fibres has successfully designed and executed this project, showcasing its expertise and innovation to overcome a multitude of challenges from inception to completion. The project involved complex terrain and demanding site conditions, requiring a meticulously crafted approach and cutting-edge solutions, whilst remaining safe and economic to build. 

The slope protection was achieved using a combination of advanced engineering materials and techniques. RocGuard^® (double twisted wire mesh) provided robust reinforcement against the potential rockfall hazards, ensuring long-term stability. The high-strength boulder net offered exceptional containment of large boulders, demonstrating its capacity to withstand significant impact forces. TRM^® (Turf Reinforcement Mat) was employed to address erosion control whilst promoting vegetation growth, thus enhancing slope stability through natural means. Furthermore, self-drilling rock anchors played a pivotal role in securing the slope by penetrating the substrate and delivering unmatched anchorage strength, even in the challenging geological conditions. 

Garware Technical Fibres' ability to integrate these advanced solutions into a cohesive design, highlights their commitment to excellence, innovation, safety and value for money. The project stands as a testament to their engineering prowess and dedication to delivering sustainable and reliable infrastructure solutions in an acceptable time-frame.

Tiru Kulkarni
Chief Operating Officer, Garware Technical Fibres Ltd, Geosynthetics Division