Epiroc enables precision excavation where conventional blasting faces limits.

The Shimla Bypass Project forms part of a strategic infrastructure programme led by the National Highways Authority of India (NHAI) along National Highway 5 (NH‑5), a key arterial route in Himachal Pradesh. The project, extending approximately 27.4 kilometres, has been designed to divert through‑traffic away from the city of Shimla, easing urban congestion while improving regional mobility in the hill state.

The alignment comprises multiple tunnels, bridges, and culverts constructed in geologically sensitive Himalayan terrain, where complex rock formations, fault zones, and proximity to inhabited areas demand careful construction planning. Epiroc has supported the successful advancement of the Shimla Bypass Tunnel Project by providing a mechanized rock excavation solution to Bharat Constructions (India) Pvt. Ltd.

A substantial portion of the tunnelling works has been executed using the conventional drill‑and‑blast method supported by the New Austrian Tunnelling Method (NATM), which allows flexible support measures based on observed ground behaviour. While NATM remains well suited for variable Himalayan geology, restrictions on blasting in certain tunnel sections — particularly near populated zones — created challenges related to vibration control, safety compliance, and construction timelines.

To address these constraints, Epiroc conducted a detailed technical assessment and recommended the deployment of its HB 3600 DP hydraulic breaker. The breaker was introduced as a controlled, non‑explosive excavation alternative capable of maintaining excavation progress where blasting was restricted or temporarily suspended.

Several technical adaptations were implemented to ensure suitability for underground operation, including adjustments for tunnel clearances, working cycles, and continuous duty conditions. Following commissioning and a short stabilisation period, the breaker delivered consistent and precise rock excavation, supporting steady tunnel advance without compromising safety or regulatory requirements.

Growing role for mechanized excavation in sensitive Himalayan infrastructure

Commenting on the project, Peter Royston, Business Line Manager – Attachments Division, Epiroc India, said, “With approximately three kilometres of tunnelling currently under execution, this project demonstrates how mechanized, precision‑driven excavation solutions can help maintain progress when conventional blasting is constrained. Similar infrastructure projects across sensitive regions are expected to increasingly rely on such technologies to balance safety, compliance and productivity.”

Epiroc training and on‑site support strengthen project execution

Beyond equipment supply, Epiroc provided structured operations and maintenance training for the customer’s engineering and site teams, focusing on reliability, wear management, and safe underground operation. Dedicated operator training further supported efficient use of the hydraulic breaker under demanding working conditions.

This integrated approach enabled faster equipment integration, improved uptime, and predictable performance during continuous excavation cycles — critical factors in long‑duration tunnel projects executed under regulatory and geological constraints.

Epiroc contribution supports long‑term regional connectivity

Upon completion, the Shimla Underground Bypass is expected to significantly reduce traffic congestion within the city, improve travel efficiency along the NH‑5 corridor, and strengthen connectivity across Himachal Pradesh and northern India. The project is anticipated to deliver long‑term socio‑economic benefits by supporting tourism, trade and safer transport through the mountainous region.

“With approximately three kilometres of tunnelling currently under execution, this project demonstrates how mechanized, precision‑driven excavation solutions can help maintain progress when conventional blasting is constrained.”

- Peter Royston,

Business Line Manager – Attachments Division,

Epiroc India.