一隧打通川渝，成达万高铁光明隧道贯通

Core Points - The Chengdu-Dazhou-Wanzhou High-Speed Railway (Chengda-Wan High-Speed Railway) has successfully completed the key engineering project, the Guangming Tunnel, which is a significant milestone in the construction of this railway [1][3] - The railway is designed to connect key regions in Sichuan and Chongqing, with a total length of over 8 kilometers and a design speed of 350 km/h [3][7] - The project is part of China's "Eight Vertical and Eight Horizontal" high-speed rail network, expected to be completed and operational by 2027, significantly reducing travel time between Chengdu and major cities like Shanghai and Beijing to under 7 hours [7] Construction Progress - The overall tunnel engineering design includes 136 tunnels, with 132 already completed, achieving a completion rate of nearly 97% [1] - The construction team has successfully addressed various challenges, including sudden mud and water inflow, gas, and harmful gas exceedances, with over 600 workers operating across four work fronts [5][7] - The project has completed approximately 46 million cubic meters of earthworks, representing 98.87% of the total earthworks required [7] Safety Measures - To mitigate risks associated with harmful gases like methane and hydrogen sulfide, the project management team has employed higher safety-grade explosives and digital detonators, along with enhanced ventilation and monitoring systems [5] - The use of intelligent construction equipment has improved efficiency and reduced labor intensity, ensuring that safety and quality targets are met [5]