作为国家"八纵八横"高铁网络兰州、西宁至广州通道的关键组成部分，新建西成铁路横跨青海、甘肃、 四川三省交界地带，于2022年全线开工。其中，中铁十局负责施工的XCTJ3标段位于甘肃省甘南藏族自 治州碌曲县，标段全长约23公里。 此次贯通的扎西隆隧道是该标段的核心工程之一，全长2585米，地处海拔3105米至3500米的高寒山区， 最大埋深达360米。该隧道穿越西秦岭中高山区，地质构造复杂，施工全程面临高寒、缺氧、高地应力 及软弱围岩等多重挑战，施工难度极大。 中新网兰州10月21日电 (戴文昌 徐小刚 张丽明)据中铁十局透露，由该局承建的青海西宁至四川成都铁 路(简称"西成铁路")扎西隆隧道20日顺利贯通。这一关键节点的突破，标志着西成铁路建设取得阶段性 重要进展，为后续工程推进及全线按期通车奠定基础。 图为西成铁路扎西隆隧道出口。徐小刚 摄 10月20日，航拍下的西成铁路扎西隆隧道施工现场。徐小刚 摄 面对复杂工况，该局项目团队针对地质复杂、围岩软弱易变形等痛点，创新采用主动支护理念，构建高 强度复合支护体系，并依托实时数据采集动态优化支护参数，通过科学组织与精细管理破解施工难题， 有效控制围岩变形风险。 ...

Group 1: Infrastructure Development - Major engineering projects continue construction during the "May Day" holiday, with workers dedicated to ensuring progress on key projects [1] - The Panzhing High-speed Railway is advancing with the laying of 500-meter-long steel tracks, significantly improving transportation between Guiyang and Xingyi [2][4] - The completion of the Panzhing Railway will create a high-speed transportation network connecting eight major cities in Guizhou, enhancing regional economic development [4] Group 2: Project Progress and Workforce - Over 500 workers are on-site during the "May Day" holiday for the Panzhing High-speed Railway, aiming to complete over half of the track-laying tasks in May [6] - The Kaizhou Station's four-line bridge in Chongqing has reached 60% completion, serving as a crucial hub for the Xiyu High-speed Railway [8][10] - In Gansu, multiple railway projects are seizing the "golden period" of construction during the holiday, with significant progress reported on the Tianlong Railway's Liulin Tunnel [11][13] Group 3: Regional Economic Impact - The Tianlong Railway, with a total length of 208.357 kilometers, is vital for coordinating economic development in Gansu and connecting it to the Sichuan-Chongqing region [15] - The Xining-Chengdu Railway's construction is progressing steadily, with the Fudi Tunnel entering the main construction phase, highlighting the challenges of high-altitude construction [17]