包银高铁银巴支线贺兰山隧道顺利贯通

Core Viewpoint - The successful completion of the Helan Mountain Tunnel marks a significant milestone for the Baoyin High-speed Railway's Yinba branch, laying a solid foundation for its operational launch [1][3]. Group 1: Project Overview - The Helan Mountain Tunnel, located between Yinchuan City in Ningxia and Alashan League in Inner Mongolia, spans 8,792 meters and is the first railway tunnel to cross the Helan Mountain in China [3]. - The Yinba branch of the Baoyin High-speed Railway is a crucial part of the national "Eight Horizontal and Eight Vertical" high-speed rail network, with a total length of 111 kilometers, starting from Yinchuan City and ending at Bayannur City in Inner Mongolia [6]. Group 2: Engineering Challenges and Solutions - The tunnel's construction faced significant geological challenges, including crossing six regional faults, two fold structures, and two areas with dense joints, necessitating advanced design solutions such as pre-reinforcement and water isolation [5]. - The construction process involved comprehensive geological forecasting techniques, including geological radar and advanced drilling, to assess and mitigate risks such as soft rock deformation and surrounding rock instability [5]. Group 3: Economic and Social Impact - The completion of the project is expected to play a vital role in promoting local economic development, enhancing tourism resource utilization, and meeting passenger travel demands [6].