Core Viewpoint - The successful completion of the 547-meter deep vertical shaft of the Baihetan Tunnel marks a significant breakthrough in the construction of the Yipan Expressway, overcoming complex geological challenges [1][3]. Group 1: Project Overview - The Baihetan Tunnel is a critical component of the Yipan Expressway, featuring a left line of 6,644 meters and a right line of 6,714 meters, with a maximum burial depth of 863 meters and a maximum daily water inflow of 61,800 cubic meters [3]. - The vertical shaft, with a diameter of 6 meters and a depth of 547 meters (equivalent to 180 stories), is designed for ventilation and smoke exhaust functions [3][4]. Group 2: Construction Challenges and Solutions - The project faced significant challenges due to poor surrounding rock stability, high water inflow, and risks of mud bursts and collapses throughout the construction process [3][4]. - A technical task force was established to address these challenges, employing a mechanized construction process called "SMD" for drilling, blasting, and material removal, which enhanced efficiency [3][4]. - The team utilized high-precision monitoring systems and advanced geological forecasting technologies to dynamically adjust construction plans, improving drilling efficiency by nearly doubling the progress rate [4]. Group 3: Project Progress and Future Outlook - Currently, over 90% of the roadbed, bridge, and tunnel works for the Yipan Expressway's Jinning section have been completed, with key projects advancing steadily [6]. - The expressway is expected to have 80 kilometers of road open to traffic by the end of 2025, significantly reducing travel time from Ningnan County to Panzhihua City from 5 hours to approximately 2 hours [6].