Core Viewpoint - The successful completion of the Zaxilong Tunnel marks a significant breakthrough in the construction of the Xicheng Railway, laying a solid foundation for subsequent construction progress and timely operation of the entire line [1] Group 1: Project Details - The Zaxilong Tunnel, located in Gansu Province, has a total length of 2,585 meters and is situated at an altitude of 3,105 to 3,500 meters in a cold mountainous area [1] - The tunnel has a maximum burial depth of 360 meters and traverses complex geological structures in the Xiqinling high and middle mountains [1] - The construction faced multiple challenges including cold weather, low oxygen levels, high ground stress, and weak surrounding rock [1] Group 2: Innovative Construction Techniques - The construction team from China Railway 10th Bureau adopted an "active support" concept and established a "high-strength composite support system" to address geological complexities and weak surrounding rock [1] - Real-time data collection was utilized to dynamically optimize support parameters, effectively controlling surrounding rock deformation and ensuring construction safety and quality [1] - A dual mechanism of "grid management for safety production + penetrating management" was implemented to accurately assign safety responsibilities at the frontline operational level, ensuring safety throughout the construction process [1] Group 3: Strategic Importance - The successful completion of the Zaxilong Tunnel creates favorable conditions for the construction of the Xicheng Railway [1] - Once completed, the Xicheng Railway will significantly enhance transportation links between the Lanzhou-Xi and Chengdu-Chongqing urban agglomerations [1] - The railway is expected to promote the coordinated development of the "Silk Road Economic Belt" and the "Yangtze River Economic Belt," playing a crucial strategic role in driving high-quality economic and social development in the surrounding areas and rural revitalization [1]