Core Insights - The successful completion of the "Shu'an" shield section of the Shu'an Tunnel marks a significant milestone in the construction of the Chengyu Central High-Speed Railway, laying a foundation for the timely completion and operation of the entire line [1][6] Group 1: Project Overview - The Chengyu Central High-Speed Railway is a crucial part of the national "eight vertical and eight horizontal" high-speed rail network, with the Shu'an Tunnel being a key control project [3] - The tunnel has a total length of 10,380 meters, utilizing a combination of "shield tunneling and open-cut methods," with the shield section measuring 9,824 meters, making it the longest and largest diameter earth pressure balance shield tunnel in China [3][4] Group 2: Construction Details - To accelerate the construction of the shield section, two shield machines, "Shu'an" and "Chengyu," are working in tandem, responsible for approximately 5.3 kilometers and 4.5 kilometers of tunneling tasks, respectively [3] - The "Shu'an" shield machine has a diameter of 14.5 meters, a total length of 155 meters, and weighs about 3,300 tons, making it the largest diameter earth pressure balance shield machine currently in use in China [3][4] Group 3: Technological Innovations - Intelligent technology plays a critical role in the construction process, with an intelligent driving system enabling one-click start, automatic pressure maintenance, and autonomous correction, achieving millimeter-level accuracy in tunneling [4] - The project employs a digital twin system that integrates BIM technology and three-dimensional geological models, allowing real-time aggregation of massive data for risk warning and management [4] Group 4: Impact and Future Prospects - The Shu'an Tunnel is classified as a level I risk tunnel, and its construction progress directly affects the overall timeline for the railway's operation [6] - The Chengyu Central High-Speed Railway will connect with existing and under-construction high-speed rail lines, significantly reducing travel time between Chengdu and Chongqing, thus enhancing regional economic collaboration [6]