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Abstract: METRO S.A in Santiago de Chile is increasing its net by two new lines: 3 and 6. The new lines will prolong the existing Metro net in approx. 38 km; nearly entire length will be excavated using conventional excavation methods. Specifically Line 3 includes 17 stations, 16 construction access shafts and 34 ventilation shafts. The Line 3 alignment crosses historical city center where underpasses...