Abstract In mountain areas, it is common for several railways to run through the same mountain because of terrain restrictions, and in this case a large-section tunnel with parallel lines is necessary. The Lanzhou-Chongqing high-speed railway (double-track) and the Suining-Chongqing high-speed railway (single-track), which are under construction, pass through the same hill and form a three-track large-span tunnel. Compared with other double-track railway tunnels, the three-track tunnel is characterized by its large span, relatively small height variation (i.e. small rise-span ratio), and flat structure shape. This paper briefly introduces the construction technology and techniques for the double side drift method adopted in the Xinzuofang Tunnel, which is the only three-track tunnel on the Lanzhou-Chongqing Railway.
Abstract：
In mountain areas, it is common for several railways to run through the same mountain because of terrain restrictions, and in this case a large-section tunnel with parallel lines is necessary. The Lanzhou-Chongqing high-speed railway (double-track) and the Suining-Chongqing high-speed railway (single-track), which are under construction, pass through the same hill and form a three-track large-span tunnel. Compared with other double-track railway tunnels, the three-track tunnel is characterized by its large span, relatively small height variation (i.e. small rise-span ratio), and flat structure shape. This paper briefly introduces the construction technology and techniques for the double side drift method adopted in the Xinzuofang Tunnel, which is the only three-track tunnel on the Lanzhou-Chongqing Railway.
2013, Vol. 50 