7月24日，渝厦高铁重庆菜园坝长江铁路隧道顺利贯通[1]，这是中国首条穿越长江并实现贯通的高铁隧道[1]。隧道全长11942米[1]，其中盾构段长度3845米，含穿江段1282米[1]。该工程采用了明挖法、矿山法、盾构法相结合的施工方案[1]，成功克服了复杂地质环境、城区环境以及长江主航道穿越等多重难题[1]，是渝厦高铁全线的重点控制性工程[1]。
本次施工所采用的盾构机开挖直径为12.66米，机身总长142米，总重3500吨[1]，配备239把刀具[1]。菜园坝长江铁路隧道位于菜园坝火车站下方，后者建成于1952年[1]，自2022年起停止客运[1]。
The Caiyuanba Yangtze River Railway Tunnel on the Yu-Xia High-Speed Railway achieved breakthrough on July 24, marking a major construction milestone for the project [1]. The tunnel, measuring 11,942 meters in length, is China's first high-speed rail tunnel to successfully traverse and break through the Yangtze River [1]. As a key control-point project for the entire Yu-Xia High-Speed Railway line, this tunnel represents a significant engineering achievement in connecting the route from Chongqing through Zhangjiajie, Changde, Changsha, Ganzhou, Ruijin, Longyan, Zhangzhou, and ending in Xiamen [1].
The construction of the tunnel required overcoming multiple complex challenges through an integrated approach combining open-cut excavation, mining methods, and shield tunneling techniques [1]. The shield tunnel segment spans 3,845 meters, including a submerged crossing section of 1,282 meters beneath the main navigation channel [1]. The specialized shield boring machine used for this work measures 12.66 meters in excavation diameter, stretches 142 meters in total length, weighs 3,500 tons, and operates with a cutting tool array of 239 implements [1]. The project had to navigate the urban environment while managing operations at the historic Caiyuanba Railway Station, which opened in 1952 and ceased passenger service from 2022 [1].