Core Viewpoint - The construction of the Mingshan Tunnel, a critical project for the Jiaozuo-Luoyang-Pingdingshan High-Speed Railway, is ongoing despite the challenges posed by complex geological conditions and the need for continuous safety monitoring [1][2]. Group 1: Project Overview - The Mingshan Tunnel is the longest tunnel in the Jiaozuo-Luoyang-Pingdingshan High-Speed Railway, measuring 6340.06 meters, and features the largest excavation cross-section for a soil pressure balance shield high-speed railway tunnel in the world [1]. - The tunnel construction is characterized by advanced technology and engineering scale, positioning it at the forefront of the industry [1]. Group 2: Safety Monitoring - The geological conditions are complex, primarily consisting of level V yellow earth, with a maximum burial depth of approximately 40 meters, leading to risks of settlement and collapse [2]. - Continuous safety monitoring is essential, even during the Chinese New Year holiday, with real-time data being collected and transmitted every two hours to relevant authorities [2]. - The monitoring process is meticulous, requiring high levels of patience and attention to detail, as even millimeter-level errors could pose significant engineering risks [2].

Group 1 - The construction of the Mianshan Tunnel, a key project of the Jiaoluo-Ping High-Speed Railway, has successfully completed the shield starting well's diaphragm wall construction, marking the acceleration of the world's largest diameter earth pressure balance shield tunnel construction [1] - The Mianshan Tunnel, the longest section of the Jiaoluo-Ping High-Speed Railway at 6340 meters, is being constructed using a shield method, setting a world record for the excavation cross-section size of earth pressure balance shield tunnels [1] - The project team has innovatively adopted a composite cyclic slotting scheme to address challenges posed by complex geological conditions, ensuring safety and quality while effectively advancing construction progress [1] Group 2 - The Jiaoluo-Ping High-Speed Railway spans 230 kilometers with a design speed of 350 kilometers per hour, forming an important part of China's "Eight Vertical and Eight Horizontal" high-speed rail network [2] - Upon completion, the railway will enhance the hub function of the Hunan-Guangdong corridor, enabling a one-hour travel time between Jiaozuo and Pingdingshan, which will promote regional industrial collaboration and resource sharing [2]