Tunnel construction
Videos
Tunnels are dug in types of materials varying from soft clay to hard rock. The method of tunnel construction depends on such factors as the ground conditions, the ground water conditions, the length a
Tunnel Construction
Cut-and-cover construction of the Paris Métro in France
A workman is dwarfed by the tunnel boring machine used to excavate the Gotthard Base Tunnel (Switzerland), the world's longest.
Illowra Battery utility tunnel, Port Kembla. One of many bunkers south of Sydney.
Tunnel boring machine
Videos
A tunnel boring machine, also known as a "mole", is a machine used to excavate tunnels. TBMs are an alternative to drilling and blasting methods and "hand mining", allowing more rapid excavation throu
Tunnel construction
…cross-section. Some concepts of underground mining apply. Modern techniques include shotcrete used in the new Austrian tunnelling method, use of a tunnel boring machine (TBM) or tunnelling shield. But still tunnels are constructed which are secured with pit props and shoring and then are steined or timer supports are…
One of the boring machines used for the Channel Tunnel between France and the United Kingdom
Cutting shield used for the New Elbe Tunnel
Looking towards the cutting shield at the hydraulic jacks
A tunnel boring machine cutter head being lowered underground for the construction of the City & Southwest line of the Sydney Metro