After 1,320 days of construction, the Xiangyang No. 2 Tunnel, a control project for the entire Xi'an to Chongqing high-speed railway line constructed by the 20th Bureau of China Railway, was successfully completed on October 20, laying a solid foundation for the completion and opening of the entire line to traffic on schedule. The Xi-Chongqing high-speed railway is an important part of the national “eight vertical and eight horizontal” high-speed railway network between Beijing and Kunming and Baohai Corridors. The total length of the main line is about 739 kilometers. The construction was divided into two sections from Xi'an to Ankang and from Ankang to Chongqing. Among them, the section from Xi'an to Ankang was opened and operated on September 28. Li Chengzhi, manager of the Xi-Chongqing High Speed Rail Project Division 1 of the 20th Bureau of China Railway, explained that the Xiangyang No. 2 Tunnel, which was completed this time, is located in Xuanhan County, Dazhou City, Sichuan Province. The maximum depth of the tunnel is about 1,150 meters. It crosses poor geology such as strong karst, high gas, rock fracture zones, and large deformation of soft rock. It is a full-line control project. The construction unit relied on high-precision advanced geological forecasting systems, mature water outflow treatment plans in complex karst areas, and methods combining automated gas monitoring and manual inspection to effectively overcome the effects of complex geological risks, and accumulated replicable experience for the construction of similar complex geological long tunnels in China.

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