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The first high -speed rail tunnel in Shaanxi Yan'an successfully penetrated

Author:West Railway Information Time:2022.07.04

11:00 on July 4

Along with the roar of the excavator

Xiyan High -speed Railway Liujiahe No. 2 Tunnel

The last layer of loess successfully broke the wall

It marks the smooth penetration of Liujiahe Tunnel

This is the second tunnel that runs through the West Extension High Speed Railway

It is also the first high -speed rail tunnel in Yan'an, the old district of Shaanxi Revolution

The Xiyan High -speed Railway Liujiahe No. 2 Tunnel is located in Luochuan County, Yan'an City, Shaanxi Province. It is 610.5 meters in length and is a single hole and double -line tunnel. The entire tunnel buried depth, thin coverage layer, and poor geological conditions. It is very easy to cause crushing and collapse of the surrounding rocks, and the loess layer of the outside of the tunnel is strong, with low loading capacity. Essence

In order to ensure the safety of tunnel construction, the construction unit Xichengke Shaanxi Company shall use the standard red high -speed rail as the standard. In the tunnel construction, an intelligent comprehensive management and control system, engineering dispatching information management control system, and intelligent security monitoring system are used in tunnel construction. And a number of intelligent control measures such as the new type of escape system of railway tunnels to ensure that the quality and construction safety of the project is always in a controllable state.

The construction unit China Railway Twenty Bureau West Extension High -speed Railway Project Department has been in the cave in August 2021, and it is difficult for the loess to enter the cave, penetrate the loess cavity group, and the shallow burial ditch. The principle of weak surrounding rock "fast digging and fast closure", strictly control the sedimentation and deformation of the tunnel by adopting measures such as "Guan Chaoqian, Short Rules, Fast Circulation, Strong Protection, Early Closed, and Diligence Testing". Paths such as low loading capacity and easy deformation of the trap.

"There are 43 tunnels from the Tongchuan to Yan'an section of the Xiyan high -speed rail. The geology of the Liujiahe No. 2 tunnel of the Liujiahe River is the venue of self -wet and wet loess. The thickness is 20 to 25 meters. Burning the ditch, the construction difficulty is difficult. During the tunnel excavation, we recovered the loessing acupoints and set up a trench -anti -drainage facilities, which well limited the further development of the cavity, and the foundation for the smooth progress of the tunnel construction. "Xicheng Xicheng Han Wenchao, senior engineer of Shaanxi Company, said.

As the second -connected tunnel of the West Extension High Speed Railway, the smooth penetration of the Liujiahe Tunnel No. 2 Tunnel provides valuable experience for the construction of the subsequent wet trap and loess tunnel, and also marks the further acceleration of the construction of the Xiyan High -speed Rail Tunnel project.

Xi'an to Yan'an high -speed railway is the first high -speed rail of the old revolutionary district of Shaanxi. It is an important part of the national high -speed railway network bag (silver) sea high -speed railway channel. The important component of the main skeleton of the font high -speed rail network is a key construction project in the "Fourteenth Five -Year Plan" period. The total length of the line is 299.8 kilometers, and the construction standard is a dual -line high -speed railway with a design speed of 350 kilometers per hour.