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Tunnel Engineering

Designing and safely delivering resilient tunnels through complex ground and urban environments

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Tunnels shape how cities move, water flows and communities stay connected. From dense urban corridors to challenging geological conditions, underground infrastructure demands precision, foresight and disciplined delivery.

We design tunnels to operate reliably from the first day of construction through decades of operation. By bringing together deep geotechnical insight, advanced modeling and practical construction expertise, we equip clients managing uncertainty, reducing risk and moving forward with confidence.

Tunnel Engineering Solutions

Safe, buildable tunnels start with understanding uncertainty — and designing for it.

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Tunneling methods

Designing and delivering soft ground, hard rock, and Sequential Excavation Method (SEM) and New Austrian Tunneling Method (NATM) tunnels. Success relies on Selecting excavation approaches that reflect real ground conditions, program demands and construction risk. Our focus is simple: balance safety, constructability and performance from day one. 

tunnel systems

Tunnel systems and linings

From tunnel boring machine (TBM) specification to precast segmental and cast-in-situ linings, we design systems that support durability, efficiency and long-term resilience. Every element is engineered to withstand the realities of ground pressure, groundwater and operational demands. 

tunnel

Underground structures

Designing cut-and-cover structures, shafts and caverns that integrate seamlessly with surrounding infrastructure. By aligning underground and surface systems early, we reduce risk, streamline delivery and protect communities throughout construction. 

Understanding tunnel engineering

A practical Q&A exploring how tunnel projects come together and the engineering behind them.

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Tunnel engineering involves the planning, design and delivery of underground tunnels and associated structures to safely move people, water, utilities and goods through complex ground conditions.

The right tunneling method is selected based on ground conditions, groundwater, tunnel geometry, surface constraints, safety requirements and construction schedule.

Soft ground tunneling typically uses tunnel boring machines or SEM methods in soil or weak rock, while hard rock tunneling often involves tunnel boring machines or drill-and-blast techniques in competent rock formations.

Tunnel boring machines excavate tunnels efficiently and safely in a wide range of ground conditions, reducing surface disruption and improving construction control.

Safety is managed through ground investigation, risk assessment, control of ground and water, monitoring, ventilation and fire and life safety systems and real-time data to support informed decisions during construction.

Tunnel engineering relies on underground construction approaches such as tunnel boring machines, trenchless techniques and optimized shaft locations to minimize impacts on communities, traffic and existing infrastructure.

Tunnel engineering supports sustainability by optimizing alignment and construction methods, reducing embodied carbon, limiting surface impacts and improving long-term asset performance.

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  • Durability Studies

    We ensure that materials used in underground spaces meet the demands of underground structures, providing durable solutions tailored to the environment.

  • Construction Impact Assessments

    Evaluating the impact of excavating tunnels and other underground infrastructure on adjacent buildings and utilities, including the development of monitoring and instrumentation schemes.

  • Tunnel Ventilation, Fire & Life Safety Systems

    Designing ventilation, fire and life safety systems for underground energy and power infrastructure.

  • Space-Proofing for Underground Infrastructure

    Developing geometries and layouts for underground facilities and tunnels, including space-proofing and clash detection to ensure that tunnel systems are adequately incorporated, using in-house design automation tools and BIM to enhance efficiency.

  • 2D & 3D Numerical Modeling for Soil-structure Interaction Problems

    We deploy a wide range of digital solutions, from automated analyses for common problems to tailored 2D and 3D solutions that meet project requirements.

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