en.Wedoany.com Reported - Recently, the section between the No. 5 inclined shaft and the No. 6 inclined shaft of the left tube of the Xigu Tunnel on the Lanhe Railway project, constructed by China Railway Group Limited First Engineering Bureau, was successfully holed through. With this, the left tube of the Xigu Tunnel has been fully completed. Spanning Xigu District in Lanzhou City and Yongjing County in Linxia Prefecture, Gansu Province, the Xigu Tunnel is approximately 22 kilometers long, making it the longest Grade I high-risk tunnel on the entire Lanhe Railway line. Its construction progress directly impacts the opening time of the whole line.
The tunnel adopts a double-tube single-track design, with the left and right tubes constructed separately. The China Railway First Engineering Bureau is responsible for the construction tasks of approximately 8.6 kilometers of the left tube, about 8.8 kilometers of the right tube, and the corresponding inclined shafts. The breakthrough of the left tube has cleared obstacles for subsequent ballastless track construction and material transportation.
The Xigu Tunnel traverses the transition zone between the Loess Plateau and the Qinghai-Tibet Plateau, featuring complex geological conditions with multiple intersecting regional faults. Problems such as fault fracture zones and large deformation of soft rock occur frequently. The project site is characterized by high altitude, deep mountains and ravines, and a fragile ecological environment along the route. It faces challenges in long-distance ventilation for the lengthy tunnel, material transport inside the tunnel, reverse slope drainage, and environmental and water conservation. This tunnel breakthrough has opened up the critical section that was constraining project progress.
To cope with the complex construction environment, the project team utilized technical means such as advanced geological prediction with ground-penetrating radar and 3D digital cross-section scanning to dynamically capture geological changes and optimize construction parameters. The tunnel construction was equipped with safety assurance facilities including variable frequency ventilation fans, arch crown void prevention devices, toxic and harmful gas early warning and monitoring systems, intelligent access control and personnel positioning systems, in-tunnel emergency rescue communication systems, and work face monitoring safety management systems, ensuring the safe progress of this tunnel breakthrough.
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