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The document discusses various aspects of tunnel engineering including: 1) Classification of tunnels by purpose, shape, material type, and alignment. Common tunnel types include highway, railway, and rapid transit tunnels. 2) Components of tunnels including the roof, crown, walls, invert, portals, ventilation, and drainage systems. 3) Survey methods used to determine tunnel alignment including initial reconnaissance, selecting potential alignments, and fixing the tunnel center line. 4) Different tunnel lin

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