Tunnel drilling covers drilling at the tunnel face in metro, road tunnel and infrastructure projects; in tunnels excavated by drill and blast, the accuracy of the hole layout governs advance efficiency and profile quality.
Scope
- Tunnel drilling for metro, road tunnels and infrastructure projects
- Applying the face hole layout according to the design profile
- Monitoring rock conditions during drilling with MWD
- Providing input to support requirements from drilling data
Why does the hole layout matter?
At the tunnel face, hole position, direction and depth directly affect the blast result. Hole deviation can cause overbreak or profile errors, so drilling accuracy and its recording matter.
Experience
Our founder Rıza Sağlam has worked as tunnel and blasting works supervisor on Istanbul metro projects and as drilling-blasting supervisor on tunnel projects in Europe.
Frequently asked questions
What is the drill and blast method in tunnelling?
Holes are drilled in the tunnel face according to the profile layout, charged with explosives and fired in a controlled way, and the rock is excavated. Support is then installed and the cycle repeats.
What does MWD provide in a tunnel?
Data recorded while drilling gives information about rock hardness, fracturing and weak zones, which can be used as input for support and blast design.
Why is drilling accuracy important?
Hole deviation reduces blast efficiency and raises the risk of overbreak or profile errors, so hole position, direction and depth are recorded and checked.
When is support installed in a tunnel?
In the drill and blast cycle, support is installed after blasting and excavation according to rock conditions. MWD data can provide input to the assessment of support needs.