Abstract: Due to its particular location and huge scale, the Badaling Great Wall underground station has the following features: large span, large coverdepth, stacked/overlapped tunnels/caverns, a large number of historical sites, strict environmental protection requirements, large passenger flow, and short train headway. The construction of the Badaling Great Wall underground station faces problems in the following aspects: the design and construction organization of the stacked/overlapped tunnels/caverns, the construction of the tunnel with superlarge span, the protection of the cultural relics and environments, and the operation of the complex underground station. Key construction and operation technologies proposed or developed to address these challenges are as follows: (1) The building information modelingbased collaborative design of the underground station, the construction safety guarantee technologies for the stacked/overlapped tunnels/caverns with small clearance, and the intelligent construction organization of the stacked/overlapped tunnels/caverns, which realizes the optimum layout of the stacked/overlapped tunnels/caverns and the efficient construction organization of the complex structure. (2) With active support technology, sequential excavation technology and long service life structure system for the tunnel section with superlarge span, safe and rapid construction of the tunnel section with superlarge span in soft surrounding rock is achieved. (3) The problem of the tunnel passing underneath the scenic area is solved due to the recessive design of the exit of the underground station, the quantitative control of the microvibration microdamage precise blasting, the ventilation and dust control during the construction of the underground station and the adoption of the clean/sewage water separation and drainage system. (4) Due to the comfortable environment created, the intelligent disaster prevention, evacuation and rescue system, the intelligent operation/management system, and the intelligent energy management system adopted for the deep underground station consisting of stacked/overlapped tunnels/caverns, the riding comfort and life safety of the passengers are ensured and efficient and energysaving operation of the complex deep underground station is achieved.

Key words: highspeed railway underground station; tunnel with superlarge span, stacked/overlapped tunnels/caverns with small clearance, active support, tunnel passing underneath scenic area, intelligent operation and management