Group 1 - The Jibin High-speed Railway Airport Tunnel, constructed by Shandong Iron Investment Lunan High-speed Railway Co., Ltd. and undertaken by China Railway 10th Bureau, has successfully completed its tunneling, laying a solid foundation for the timely opening of the entire line [2] - The tunnel, located at Jinan Yaoqiang Airport, spans 2710 meters and is the first high-speed railway tunnel in China to be constructed using the open-cut method in a high-water-content soft soil layer, coexisting with the terminal building [5][8] - The maximum excavation depth of the tunnel reaches 19 meters underground, with a maximum width of 55.4 meters, categorizing it as an ultra-long and ultra-wide deep foundation pit, which poses significant construction challenges due to high groundwater levels and soft soil conditions [5][7] Group 2 - The project commenced 9 months later than other sections of the line, with a tight construction schedule and complex working environment [7] - China Railway 10th Bureau implemented advanced technologies such as digital twin technology and BIM combined with three-dimensional geological scanning to address construction challenges, ensuring safety and precision in the excavation process [7] - The Jibin High-speed Railway is a crucial part of the Tianjin-Weifang High-speed Railway corridor and the rapid railway network in Shandong Province, contributing to the national railway network and regional economic development [8]