蜀安隧道“蜀安号”盾构段顺利贯通

Core Viewpoint - The Chengyu Middle Line High-Speed Railway has achieved significant progress with the successful completion of the "Shu'an" shield tunnel section, marking a crucial milestone for the project's timely completion and operation [3][4]. Group 1: Project Progress - The Shu'an Tunnel, a key project of the Chengyu Middle Line High-Speed Railway, has a total length of 10,380 meters, utilizing both "shield tunneling and open-cut" construction methods, with the shield section measuring 9,824 meters [3]. - The "Shu'an" shield machine, with a diameter of 14.5 meters and a total length of 155 meters, is the largest earth pressure balance shield machine currently in use in China, specifically designed for the local geological conditions [3]. - The project employs two shield machines, "Shu'an" and "Chengyu," which have excavated approximately 5.3 kilometers and 4.5 kilometers, respectively [3]. Group 2: Construction Challenges - The construction of the Shu'an Tunnel involves crossing over 30 significant structures, with a strict settlement control precision of within 1 millimeter per instance, making the construction process highly challenging [4]. - An innovative intelligent construction system has been established, integrating one intelligent device, two management platforms, and one intelligent system, allowing remote monitoring of underground construction dynamics [4]. Group 3: Future Implications - The Chengyu Middle Line High-Speed Railway is a vital part of China's "Eight Vertical and Eight Horizontal" high-speed rail network, with a total length of 292 kilometers and a designed speed of 350 kilometers per hour [4]. - The railway is expected to be completed and operational by 2027, significantly reducing travel time between Chengdu and Chongqing to 50 minutes, thereby enhancing transportation convenience for local residents and supporting the development of the Chengdu-Chongqing economic circle [4].