西十高铁全线隧道顺利贯通

Core Viewpoint - The successful completion of the Hujia Yuan Tunnel marks the full breakthrough of all 42 tunnels of the Xishi High-speed Railway, laying the foundation for the comprehensive construction of ballastless tracks and the operation of the line [1][2] Group 1: Project Overview - The Xishi High-speed Railway has a total length of 255.7 kilometers, with the Shaanxi section measuring 169.4 kilometers and the Hubei section measuring 86.3 kilometers [1] - The Hubei section includes 26.5 tunnels, with a total length of 77 kilometers, accounting for 89% of the section [1] Group 2: Tunnel Details - The Hujia Yuan Tunnel, located in the Yuxi County of Shiyan City, is 4,456 meters long and has a maximum burial depth of approximately 200 meters [1] - It is the last tunnel to be completed in the Hubei section and is considered a key project due to its complex geological conditions, including the crossing of three fault zones and a high proportion (84.4%) of grade IV and V surrounding rock [1] Group 3: Construction Challenges and Solutions - The construction faced significant challenges such as high groundwater content and unstable geological conditions, with over 30% of the tunnel located in soft rock areas prone to deformation [1] - The construction unit adhered to principles of safety, quality, speed, environmental protection, and cost-effectiveness, employing advanced support measures like pre-injection grouting to ensure stability and control risks [2] - The use of GIS visualization platforms enhanced process management and allowed for dynamic adjustments to support parameters and excavation methods, ensuring safety during construction [2] Group 4: Strategic Importance - The Xishi High-speed Railway is a crucial component of the national railway network planning and the "13th Five-Year" development plan, designed for a speed of 350 kilometers per hour [2] - Once completed, it will enhance connectivity between the Guanzhong urban agglomeration and the Yangtze River midstream urban agglomeration, promoting socio-economic development along the route [2]