1800s
The first successful tunnelling shield was developed by Sir Marc Isambard Brunel to excavate the Thames Tunnel in 1825. However, this was … See more

Behind all types of tunnel boring machines, in the finished part of the tunnel, are trailing support decks known as the backup system, whose mechanisms can include conveyors or other systems for muck removal; slurry pipelines (if applicable); control … See more

• Channel Tunnel – Undersea rail tunnel linking France to UK
• New Austrian tunneling method – Method of modern tunnel design and construction
• Roadheader – Excavation equipment See more

• Robbins. "Tunneling World Records". Robbins. Retrieved 2023-10-18. See more

TBMs typically consist of a rotating cutting wheel in front, called a cutter head, followed by a main bearing, a thrust system, a system to … See more

Urban tunnelling has the special requirement that the surface remain undisturbed, and that ground subsidence be avoided. The normal method of doing this in soft ground is to maintain soil pressures during and after construction.
TBMs with positive … See more

• Barton, Nick (2000). TBM tunnelling in jointed and faulted rock. Rotterdam: Balkema.
• Bilger, … See more