The Xiangli Expressway starts from Yisong Village in the southern part of Shangri-La City and extends all the way to the Baihanchang Interchange of the Dali Expressway, with a total length of 140.305 kilometers and a mainline length of 124.55 kilometers. This road is an important project supported by the state for the economic and social development of the Deqen Tibetan Autonomous Prefecture in Yunnan Province. It is also the first expressway in the Tibetan area of Yunnan Province and the highest-altitude expressway.

　　The Kaida Valley Tunnel is located in Yulong County, Lijiang City, with a total length of 3145.27 meters for the right line and 3145 meters for the left line. The deepest point is buried about 558 meters deep and crosses three fault zones. The exit of the tunnel is a typical area of large deformation of soft rock, and is severely affected by faults, with serious rock cracks, splitting, and deformation around the tunnel. During construction, facing the severe deformation of weak rock layers posed a huge challenge to the tunneling work.

　　The LanHi Intelligent Arch Spray Integrated Trolley is a tunnel construction equipment jointly developed by Blue Ocean Zhizhuang and Sichuan Road and Bridge Tunnel Branch. It adopts a structure with an engineering chassis, four-wheel drive, four-wheel steering, and front and rear bidirectional driving. The upper part is equipped with three arms with full sliding movement, three gripper hands, two baskets, two undercut hammers, and two anchor arm structures, which can achieve seamless connection of various construction processes during tunnel construction, improving construction efficiency and reducing safety hazards and occupational injuries.

　　On December 22, 2020, the left line of the Kaida Valley Tunnel on the Xiangli Expressway, with a total length of 3145 meters and crossing three fault zones, was successfully penetrated, laying a solid foundation for the construction of the entire expressway.