Tunnel boring machine

Cutting shield used for the New Elbe Tunnel.

Top view of a model of the TBM used on the Gotthard Base Tunnel.

A tunnel boring machine (TBM), also known as a "mole", is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata. They may also be used for microtunneling. They can bore through anything from hard rock to sand. Tunnel diameters can range from a metre (done with micro-TBMs) to 19.25 metres to date. Tunnels of less than a metre or so in diameter are typically done using trenchless construction methods or horizontal directional drilling rather than TBMs.

单词	Bored tunnel
释义	Bored tunnel 原声例句科普小杂文 Its tunnels were built using a method known as cut-and-cover, where rather than boring a tunnel through the ground, instead, a massive trench is dug, the railway built, and then the trench roofed over again. 地铁隧道是以明挖覆盖式工法兴建，不直接挖穿地面，而是挖掘坑道、兴建铁路轨道，再将地面回填。 007系列之皇家赌场 He pushed the revs up and up, hurrying the car to eighty then to ninety, his huge Marchal headlights boring a safe white tunnel, nearly half a mile long, between the walls of the night. 他把转速越来越高，把车子开到八十，然后又开到九十，他巨大的马夏尔车头灯在夜幕之间穿出一条安全的白色隧道，将近半英里长。英语百科 Tunnel boring machine A tunnel boring machine (TBM), also known as a "mole", is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata. They may also be used for microtunneling. They can bore through anything from hard rock to sand. Tunnel diameters can range from a metre (done with micro-TBMs) to 19.25 metres to date. Tunnels of less than a metre or so in diameter are typically done using trenchless construction methods or horizontal directional drilling rather than TBMs.
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Bored tunnel

Tunnel boring machine