渝昆高铁云南段隧道贯通超九成

Core Points - The Yukun High-speed Railway's Yunnan section has achieved over 90% tunnel completion with the recent breakthrough of the Daping Tunnel [1][3][5] - The Daping Tunnel, a critical project, spans 12.3 kilometers and is classified as a high-risk tunnel due to its challenging geological conditions [3][5] - The construction employs advanced technologies to mitigate risks, successfully navigating through high-risk segments [3][5] Group 1 - The Yukun High-speed Railway will significantly reduce travel time between Chongqing and Kunming, enhancing economic development along the route [5] - The Yunnan section of the railway is 388.6 kilometers long, with a design speed of 350 kilometers per hour, marking it as the first high-speed railway in Yunnan to reach this speed [5] - Currently, over 14,000 construction workers and more than 1,500 large machinery units are engaged in the project, with earthworks and bridge-tunnel construction nearing completion [5]