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A tunnel boring machine (TBM) excavates tunnels with a circular cross-section through various soil and rock strata using a rotating cutting wheel at its front end. It was improved over time with innovations like rotating cutting heads instead of individual grinding spikes. Modern TBMs typically have one or two large metal cylinder shields at the front, with mechanisms behind it to remove soil and support the tunnel as it progresses forward through hydraulic jacks and precast lining segments. TBMs can constr

Author

PRASENJIT DHAR

Language

EN