重大控制工程 成昆复线大坪山隧道贯通

Core Viewpoint - The completion of the Daping Mountain Tunnel marks a significant milestone in the Chengkun Railway double-track project, enhancing transportation capacity in Southwest China and improving connectivity with neighboring regions [2] Group 1: Project Details - The Daping Mountain Tunnel, measuring 11.34 kilometers, is located in Leshan City, Ebian County, and is the second long tunnel over 10 kilometers in the Chengkun Railway double-track project [2] - The tunnel construction faced numerous challenges, including crossing five fault zones, encountering soft rock deformation over 1,574 meters, and dealing with significant water inflow, with a maximum flow rate of 32,000 cubic meters per day, equivalent to 177 standard swimming pools [2] - The construction site experienced high temperatures reaching 45 degrees Celsius and difficulties in ventilation and smoke exhaust due to the single tunnel face advancing over 5,000 meters [2] Group 2: Economic Impact - The Chengkun Railway double-track is a crucial part of the railway backbone network in the western region of China, with only the most challenging section from Emei to Miyi remaining to be completed, expected to be finished in 2023 [2] - Once operational, the new railway line will separate passenger and freight transport, significantly enhancing the railway transportation capacity in Southwest China and improving connectivity between Southwest and Northwest China, as well as with South and Southeast Asia [2] - The new line will reduce travel time from Chengdu to Panzhihua and Yunnan, and is expected to drive sustained economic development in the region and along the railway [2]