Sprint for the first quarter and strive for a good start | 4000 meters! There has been new progress in the Daqing Tunnel of Xining Expressway

On March 3rd, the left tunnel excavation of the Daqing Tunnel of the ZCB4-1 section of Xining Expressway, constructed by Shengtong Company, officially broke through the 4,000-meter mark, marking the entry of tunnel construction into the final sprint stage.

As one of the key control projects of the Xining Expressway, the Daqing Tunnel is over 10 kilometers long, with a maximum burial depth of 720 meters. The longitudinal slopes of both the left and right lines are 2.5%, and the height difference between the entrance and exit is 250.35 meters. It is currently the world's longest longitudinal slope expressway super-long tunnel with the highest height difference between the entrance and exit. The tunnel body as a whole passes through a zone with a seismic intensity of nine degrees, running parallel and crisscrossing along the Autonomous Mo-Qiaowo Fault and the Zemuhe New Century Fault Zone. The geological conditions are complex and the water intake is large, making the construction extremely difficult and posing significant challenges to the project's safety production, environmental protection and other management aspects.

During the tunnel excavation process, the project vigorously promoted the automated section monitoring system. By applying technologies such as AI and deep learning convolutional neural networks, it conducted reference perception, precise analysis and early warning of the micro-deformation process of the tunnel. The extensive application of intelligent safety helmets has achieved a five-in-one integration of "perception, analysis, service, command and monitoring", creating a new model for engineering safety monitoring. At the same time, it has pushed the intelligence level of the Daqing Tunnel to a new height.

In view of the actual situation of large water inflow in the tunnel, an integrated and collaborative management system of clean and sewage separation, sewage treatment, and water quality monitoring and early warning has been established to achieve functions such as integrated drainage of the left and right tunnels, clean and sewage separation, automatic water quality monitoring, and early warning of over-limit water quality. The tunnel sewage is purified and discharged to the first-level standard, contributing to the construction of a green Xining expressway.

Next, the project department will continue to uphold the concept of "safety first, quality supreme, and green environmental protection", constantly innovate technologies, optimize management, ensure the smooth breakthrough of the Daqing Tunnel, and contribute to the early opening of the Xining Expressway.