我国首条穿越贺兰山铁路隧道贯通

Core Points - The completion of the Helan Mountain Tunnel, part of the Baoyin High-speed Railway's Yinba branch, marks a significant achievement in China's infrastructure development, with a total length of 8,792 meters [1] - The tunnel is located at the intersection of Inner Mongolia and Ningxia, facing complex geological conditions and high environmental sensitivity, including a maximum burial depth exceeding 230 meters [1] - The construction team employed innovative low-disturbance techniques to minimize impact on historical sites, ensuring efficient and high-quality tunneling [1] Infrastructure Development - The Helan Mountain Tunnel is a critical control project for the Baoyin High-speed Railway's Yinba branch, which spans approximately 111 kilometers from Yinchuan to Bayannur [1] - This railway line is an essential part of China's national "Eight Horizontal and Eight Vertical" high-speed rail network, aimed at enhancing regional connectivity [1] - The project is expected to significantly contribute to the high-quality economic and social development of the Ningxia and Inner Mongolia regions [1]