成达万高铁光明隧道贯通

Core Insights - The Chengdu-Dazhou-Wanzhou High-Speed Railway (referred to as Chengda-Wan High-Speed Railway) is a significant infrastructure project that is expected to be completed and operational by 2027, reducing travel time from Chengdu to Shanghai and Beijing to under 7 hours [2][3] Group 1: Project Progress - The railway's tunnel engineering includes the design of 136 tunnels, with 132 already completed, and the project has now entered the construction phase for ballastless track beds, station buildings, and electrical systems [2] - The Guangming Tunnel, a key component of the project, spans over 8 kilometers and is designed for a speed of 350 km/h, featuring a single-tube double-track low-gas tunnel [2] Group 2: Construction Challenges and Solutions - The construction faced significant challenges, including unstable surrounding rock, mud and water bursts, and the presence of harmful gases, which posed high safety risks [2][3] - The project management team implemented higher safety standards by using specialized mining explosives and digital detonators, along with enhanced ventilation and monitoring systems to ensure safety during construction [2] - Over 600 workers are engaged in simultaneous construction across four work fronts, successfully overcoming various difficulties related to the tunnel [3] Group 3: Overall Project Status - Approximately 46 million cubic meters of earthworks have been completed, accounting for 98.87% of the total, with all bridge pile foundations, caps, and pier bodies finished, and three out of four turning bridges completed [3] - The Chengda-Wan High-Speed Railway is an essential part of China's "Eight Vertical and Eight Horizontal" high-speed rail network, connecting key cities in Sichuan and Chongqing [3]