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Tunnels
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Roads & Structures

Tunnels

Tunnel excavation, support and associated underground civil works in demanding ground conditions.

Roads & StructuresTunnelsServices

Delivery scope

Underground works with controlled execution

Tunnel construction combines excavation with continuous management of ground behaviour, water, ventilation and restricted access. The required sequence can include portal preparation, excavation, temporary support, rock stabilisation, drainage and permanent lining, with the exact approach governed by site conditions and engineering requirements. Safe and orderly progress relies on observing changing ground, maintaining access and coordinating each support activity close to the advancing face. The four points below set out the practical controls that shape underground execution.

Tunnel ground support work
Tunnel excavation crew and machinery
  1. 01

    Portal and construction-access works arranged to support excavation, material movement and underground operations.

  2. 02

    Excavation activities coordinated with the specified temporary support and rock-stabilisation requirements.

  3. 03

    Ventilation, water management and drainage maintained as integral parts of the underground work sequence.

  4. 04

    Lining and associated civil works planned around ground conditions, access constraints and completed support.

Delivery focus

Keeping excavation, support and access aligned

Underground progress depends on the timely relationship between excavation and the measures that make the opening stable and workable. Ground response, seepage and access conditions can change along the alignment, so construction planning must retain the flexibility to sequence support, drainage and temporary works appropriately. Clear work zones and dependable ventilation and material routes are equally important to maintaining controlled operations.

Ground support

Coordinate excavation advances with the support and stabilisation measures specified for observed conditions.

Water & drainage

Manage seepage and construction water so working areas, access routes and permanent works remain protected.

Access & temporary works

Maintain practical routes, ventilation and temporary arrangements for people, plant and materials underground.

Project photography

Work from the field

A closer view of infrastructure work, site conditions and construction activity related to this service.

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