四川西昌至香格里拉高速公路全线首座特长隧道双幅贯通

Core Points - The Hainan Tunnel, the first major tunnel of the Xichang to Shangri-La Expressway, has achieved dual-lane completion, marking significant progress in the construction of the Xichang Expressway [1][3] Group 1: Project Overview - The Xichang Expressway is planned to have a total of 16 major tunnels, with 57 kilometers of tunnel excavation completed to date [3] - The Hainan Tunnel features a left line of 3,448 meters and a right line of 3,508 meters, designed for a dual four-lane standard with a speed limit of 80 km/h [3] Group 2: Construction Challenges - The tunnel is located in a high seismic intensity area and traverses complex geological formations, including shale, sandstone, and mudstone, with over 72% of the surrounding rock classified as V-grade, indicating poor self-stability [3] - The construction team has implemented innovative management techniques leveraging IoT technology to address geological challenges, including a digital management platform for 24/7 monitoring [3] Group 3: Environmental Considerations - To minimize ecological impact, a wastewater treatment system has been employed, implementing a "clean and sewage separation" approach, with treated water reused for dust control and forest spraying [3]