China Building Deepest Underground High-Speed Railway

China is building the world’s deepest and Asia’s largest underground high-speed railway station.

Workers are constructing the high speed railway beneath the Great Wall at the Badaling section in Beijing.

The station under construction will be 3-story high and have a 36,000 square meters floor area, including platform, entrance and exit. The railway tracks will be 102 meters underground.

According to Sputnik, the station is an important part of a 12.01 kilometres long tunnel section of the 174-kilometre Beijing–Zhangjiakou high-speed railway line.

The tunnel is the longest one of the railway line.

“Passengers will enter and exit the station about 100 meters underground, and it will be very safe,” said Dai Longzhen, a senior manager of the construction company China Railway No 5 Engineering Group Co Ltd.

To secure the safety of passengers, the station will change the inclined shafts that are used to build the station as permanent rescue channels.

The underground burrowing work is the country’s most complicated, because the station has to contain 78 caverns and lots of intersections, said Chen Bin, a commander-in-chief of the project.

Starting from the construction of the tunnel on April 15, 2016, workers have known how tough the work will be, however the hardness of the rocks still exceeded their expectations, said Jiang Si, a manager of the company.

According to its initial plan, workers could excavate the tunnel 6 to 8 meters a day, but the tough rock meant workers could dig only about 2 meters a day.

Large–size shield tunneling machines could not be used, and workers could only use the blasting method in the construction, Dai said.

“The No 1 shaft has a 80-degree turn, and the No 2 shaft has a 135-degree turn, which prohibits the machines more than 100 meters long from working there,” Dai said.

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