Xiongxin high-speed rail Wutai Mountain tunnel breakthroughs 10,000 meters mark.

On June 16th, it was learned from the Xiongxin high-speed rail 2nd section project of China Railway Tunnel Bureau Group that the key control project of the Beijing-Kunming passage of the national "Eight Vertical and Eight Horizontal" high-speed railway network, the Xiongxin high-speed rail Wutai Mountain Tunnel, has exceeded 10,000 meters in excavation, completing 71% of the total tunnel length of 14,097.73 meters, laying a solid foundation for the subsequent completion of the entire tunnel. As the "throat" project of the Shanxi section of the Xiongxin high-speed rail, the geological conditions of the Wutai Mountain Tunnel are extremely complex, with abundant underground water, requiring crossing through karst areas and multiple fractured zones. The IV and V grade surrounding rocks of the main tunnel total 8,502 meters, accounting for 60.3%, with high construction difficulty and safety risks. According to the person in charge of the Xiongxin High-speed Rail 2nd Section project department of China Railway Tunnel Bureau, the construction team uses a comprehensive forecasting technology from multiple sources to fully grasp the geological conditions ahead and strengthen the identification of hazards. At the same time, considering the characteristics of the IV grade surrounding rocks of the Wutai Mountain Tunnel, they have developed the first domestic grid arch frame automated production line, achieving functions such as automatic loading of raw materials, automatic welding and splicing of main reinforcements, integrated processing and forming of eight-shaped reinforcements, automatic assembly welding of butterfly reinforcements, and automatic assembly and welding of main and butterfly reinforcements, as well as automatic cutting of arch frames to fixed lengths. Compared with traditional methods, the number of personnel per shift has been reduced from 11 to 5, significantly increasing the average production efficiency per person.