提前96天！白临高速7座隧道全部贯通

Core Insights - The successful completion of the Songling No. 2 Tunnel, a key project of the Bailin Expressway, marks a significant milestone in the construction of the entire highway, with all seven tunnels now completed ahead of schedule by 96 days, laying a solid foundation for the project's timely and high-quality opening [1][3]. Group 1: Project Overview - The Songling No. 2 Tunnel is considered the "throat project" of the Bailin Expressway, with the left tunnel measuring 2,774 meters and the right tunnel 2,697 meters, located in a region with extremely complex geological conditions [3]. - The geological conditions include 78% grade IV rock and 22% grade V rock, requiring the tunnel to pass through four fault zones and two lithological contact zones, presenting significant construction challenges [3]. Group 2: Construction Challenges and Solutions - The construction faced high risks of rock collapse and water inrush, compounded by challenges such as entrance pressure, limited ventilation, and drainage difficulties, testing the technical capabilities of the builders [3]. - The project team adopted a "zero accidents, create quality" goal and implemented a comprehensive safety management approach throughout the construction process, including the establishment of specialized task forces to address the complex geological conditions [3][4]. Group 3: Technological Innovations - Advanced technologies such as geological radar and proactive geological forecasting were utilized to accurately identify risks, while a "smart construction site" digital management model was promoted to ensure real-time visibility of personnel, equipment, and working conditions [3][4]. - Innovative techniques for ventilation and drainage, such as "multi-fan series ventilation" and "graded segmented drainage," were employed to overcome construction bottlenecks, showcasing the professional skills and determination of the construction team [4]. Group 4: Economic and Social Impact - The successful completion of all tunnels accelerates the construction of the Bailin Expressway, facilitating the advancement of subsequent road surface, traffic safety, and ancillary projects [4]. - Once completed, the Bailin Expressway will connect scenic resources along National Highway G331, integrating the majestic Changbai Mountain and the beautiful Yalu River, creating a comprehensive tourism golden route that supports the development of the cultural tourism industry and rural revitalization in southeastern Jilin Province [4].