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Abstract: The article describes the tunneling techniques used for Zam tunnel construction, section Border - Curtici – Simeria, part of Corridor IV PAN EUROPEAN for trains with maximum speed of 160 Km/h. The tunnel, whose section is double and electrified, has a length of 340 m and it is located on the left bank of the Mures river, near Deva, in an area where the slope is in contact with the river. The...