en.Wedoany.com Reported - On the morning of May 22, as the cutterhead slowly rotated, the "Chengdu-Chongqing" shield machine broke through the ground, marking the successful breakthrough of the entire Shu'an Tunnel, designed by China Railway Eryuan Engineering Group Co., Ltd. This also signifies the breakthrough of the last tunnel on the Chengdu-Chongqing Central High-Speed Railway, China's fastest-operating and highest-standard high-speed railway.
Located in the section between Jianzhou Station and Chengdu Station in Chengdu, Shu'an Tunnel is not only the longest tunnel on the entire line but also traverses a dense urban building area in Chengdu, akin to navigating an "underground maze." The Shu'an Tunnel was constructed using a "shield method + cut-and-cover method," with the shield-driven section stretching 9,824 meters. Excavation was carried out by two custom-built, super-large diameter earth pressure balance shields, "Shu'an" and "Chengdu-Chongqing," featuring a large excavation diameter of 14.5 meters. It is currently the longest-distance and largest-diameter earth pressure balance shield tunnel ever excavated in China.
The project manager for the Chengdu-Chongqing Central High-Speed Railway's pre-station Lot 1, under China Railway 11th Bureau Group, explained that the "Chengdu-Chongqing" shield machine is equipped with a "thrust-segment assembly" parallel operation technology, enabling time-shared jacking in the thrust and assembly zones to achieve simultaneous excavation and segment lining. It also features a "horizontal continuous belt conveyor + vertical belt conveyor combination" muck removal system, setting a record for China's largest bandwidth vertical belt conveyor, with a muck transport capacity of 1,700 tons per hour.
It is reported that during the construction period, the two shield machines achieved a maximum daily advance rate of 22 meters, and a maximum monthly advance rate of 432 meters, with an average of 380 meters, placing them at a leading level globally for shield construction of the same diameter.
The Chengdu-Chongqing Central High-Speed Railway is a crucial component of China's "Eight Vertical and Eight Horizontal" high-speed rail network's Yangtze River Corridor. The line starts from Chongqing North Station in the Chongqing hub, runs westward through Chongqing's Liangjiang New Area, Shapingba District, Bishan District, Tongliang District, and Dazu District, then through Ziyang City and Chengdu City in Sichuan Province, before terminating at Chengdu Station in the Chengdu hub. The main line has a total length of 292 kilometers and a design speed of 350 kilometers per hour.
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