成渝中线高铁蜀安隧道取得重大突破！2027年从成都到重庆50分钟直达

Core Viewpoint - The successful completion of the "Shu'an" shield section of the Shu'an Tunnel marks a significant milestone for the Chengyu Central High-speed Railway, ensuring the project remains on schedule for completion and operation. Group 1: Project Details - The Shu'an Tunnel has a total length of 10,380 meters, utilizing both "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 [1][3] - The "Shu'an" shield machine has a diameter of 14.5 meters, a total length of 155 meters, and weighs approximately 3,300 tons, making it the largest diameter earth pressure balance shield machine currently in use in China [3] - The project team has developed an intelligent construction system that integrates smart devices and management platforms, enhancing the precision and efficiency of the tunneling process [5] Group 2: Construction Challenges and Innovations - The "Shu'an" shield machine successfully navigated over 30 critical structures, maintaining a strict settlement control precision of within 1 millimeter per instance, showcasing the complexity of the construction [3] - The project employs an intelligent driving system for the shield machine, achieving millimeter-level accuracy in tunneling, and utilizes a digital twin system for real-time data management and risk monitoring [5] - The goal of the project is to achieve a "three-no tunnel" standard, ensuring no damage, no leakage, and no misalignment during construction [5] Group 3: Project Significance and Timeline - The Chengyu Central High-speed Railway is a crucial part of the national "eight vertical and eight horizontal" high-speed rail network, with a total length of approximately 292 kilometers and a designed speed of 350 kilometers per hour [6] - The railway is expected to be completed and operational by 2027, with a potential maximum operational speed of 400 kilometers per hour, significantly reducing travel time between Chengdu and Chongqing to 50 minutes [6]