After over 940 days and nights of arduous efforts, the Luorongzhuang Tunnel on the Chongqing-Kunming High-Speed Railway, constructed by China TIESIJU Civil Engineering Group, was completed on August 1. This marks the first tunnel over 5 kilometers long to be completed in the Yunnan section of the Chongqing-Kunming High-Speed Railway.
Located in Songming County, Kunming City, the Luorongzhuang Tunnel is 5,260 meters long and features a single-tube double-track design. It passes through various complex geological formations, including four fault fracture zones, five karst development zones, and three micro-gas zones. The tunnel also runs beneath the existing Shanghai-Kunming High-Speed Railway and the Yinchuan-Kunming Expressway, with the closest distances being only 20 meters and 10 meters, respectively. The construction posed significant safety risks such as collapse, sudden mud and water influx, harmful gas infiltration, and ground structure settlement, making it a key control project for the Kunming hub section of the Chongqing-Kunming High-Speed Railway.
The entire Chongqing-Kunming High-Speed Railway is 699 kilometers long, with the Yunnan section spanning 388.6 kilometers. Currently, 15 out of 63 tunnels in the Yunnan section have been completed. As the first high-speed railway in Yunnan Province designed for a speed of 350 kilometers per hour, completing the Chongqing-Kunming High-Speed Railway will reduce the travel time between Chongqing and Kunming from 5 hours to approximately 2 hours.
