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3 Rock Boring. Because TBM tunneling produces a much smaller disturbed zone and requires much less rock support than the drilling and blasting method, more andand soil using a tunnel boring machine. The face or the shield of the. TBM prevents water, soil and rock from entering the tunnel during construction. PDF | On Sep 14, 2001, C?gla M and others published Application of tunnel boring machines in underground mining development | Find, read and cite all the Tunnel. Boring. Machines. Slurry Shield Machine. Earth Pressure Balanced Shield Machine. Mixed Ground Shield Machine. Full Shield TBM. Tunneling in hard rock with tunnel boring machines is one of the most mechanized construction processes. Mechanization also applies to the installation of