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Tunnel construction by means of TBM (Tunnel Boring Machine) has become a preferred method of construction nowadays. In addtion, this is well accepted by the environmentalist

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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.

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Photos: Rio Tinto trials 64m-long tunnelling machine By Ry Crozier on Feb 25, 2013 7:15AM Rio Tinto's new tunnel boring machine starts trials.

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