西香高速主线首座隧道贯通 “主动脉”建设告别单点突破阶段，迈入全线推进新时期，预计2029年通车

Core Points - The completion of the Xichang to Shangri-La (G7611) expressway will end the historical lack of expressway access for Liangshan, Yanyuan, and Muli [1][2] - Travel time from Xichang to Yanyuan will be reduced from 3 hours to under 1 hour, and travel time to Lugu Lake will decrease from 5 hours to under 2 hours [1][2] - The expressway will enable a direct drive from Chengdu to Lugu Lake in 7 hours, saving 2.5 hours compared to current travel times [1][2] Project Overview - The Xichang to Shangri-La expressway is a crucial segment of G7611, serving as an important horizontal passage connecting Sichuan, Yunnan, and Guizhou, as well as a key part of the Greater Shangri-La tourism circuit [2] - The project spans over 233 kilometers, with the main line exceeding 155 kilometers, and includes three branches to Xichang, Muli, and Lugu Lake [2] - The expressway is designed to be a dual four-lane highway with a speed limit of 80 km/h, featuring 32 tunnels and 131 bridges, with a bridge-tunnel ratio of 73.4% [2] - The estimated total investment for the project exceeds 58.7 billion yuan, making it the largest expressway construction project in the province managed by a single project company [2] Construction Progress - The successful completion of the Dengjiaping Tunnel marks the first dual-bore tunnel of the main line and the fourth dual-bore tunnel overall in the project [1][2] - Following the tunnel's completion, the project will proceed with T-beam erection, road surface paving, and electromechanical installation, indicating a shift from isolated breakthroughs to comprehensive progress [1][2] - The Dengjiaping Tunnel, located in a seismically active area, faced significant construction challenges, including ground subsidence and instability [1][2] - The project team has implemented real-time deformation monitoring and automated warning systems to ensure controlled conditions during construction [1]