New breakthrough!17.763 kilometers in length!Go through

On the 6th, the newly -built Yinlan high -speed rail central defender to the longest tunnel of the Lanzhou section -Xiangshan Tunnel was fulfilled. This is the last tunnel of the Yinlan High -speed Railway Zhonglan section, and it is also the largest tunnel of the Northwest China Passenger Transport Line. The tunnel runs through the progress of the construction progress of the Yinlan high -speed railway, and has made a new breakthrough, laying a solid foundation for the operation of the entire line.

The Xiangshan Tunnel is located in Shapo Toutou District, Zhongwei City, Ningxia, with a total length of 17.763 kilometers and a design speed of 250 kilometers per hour. The tunnel crosses the Xiangshan Mountains. The geological conditions are complicated. The rock -soluble, rock explosion, high -ground stress, gas and other harmful gases, soft rock deformation, and the third series of the third series of poor water containing weak glue sand and other bad geology. The construction is difficult and it is a high -risk tunnel.

The tunnel started on October 19, 2018. It adopts the method of short tunnels, which are divided into 5 diagonal wells, 10 palm faces, 24 -hour synchronization, and circulating operations. Faced with complex technical problems, the construction team implements the construction process of "curtain grouting and reinforcement+surface precipitation". It is understood that the way of casting can stabilize the sandstone in the tube to avoid the large landslide during excavation and the surface precipitation of the surface. Methods to help control the moisture content of sandstone and avoid surging water during excavation. The combination of these two schemes greatly reduces the safety risk of construction and overcomes the construction difficulties of the sand segment.

The middle orchid section of the Yinlan High -speed Rail is an important part of my country's "Eight vertical and Eight Heng" Railway Network Jinghu Yinlan Channel, and it is also an important traffic infrastructure in the core area of ​​the "Belt and Road" construction and development. The east of the line was introduced from Zhongwei South Station. It passed the Lanzhou New District to Lanzhou Hub, with a total length of 219.976 kilometers, of which 46.249 kilometers were 46.249 kilometers, and the bridge tunnel ratio was about 88%. After the opening of the traffic, it will open up the bottleneck of the lack of fast passenger channels in the northwestern region of my country to connect North China and Northeast China. It is of great significance for promoting the development of western development, a gap between the development of regional development and promoting economic and social development. The middle orchid section of the Yinlan High -speed Rail is expected to have the operation conditions at the end of the year. At that time, the running time from the central defender to the Lanzhou train will be shortened from the current 5 hours to more than one hour.

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