新华社兰州12月10日电（记者樊曦）记者10日从中铁十八局集团了解到，历经1300余天艰苦奋战， 兰（州）至合（作）铁路全线重难点控制性工程——曲奥隧道顺利贯通，标志着工程建设取得重大突 破，为全线建成通车奠定坚实基础。 曲奥隧道位于甘肃省甘南州夏河县曲奥乡境内，全长10669米，为单洞双线隧道。隧道穿越高地应 力断层破碎带等不良地质区域，四、五级围岩占比超过七成，面临地表易变形坍塌、突泥涌水等施工难 题，为一级高风险隧道。据中铁十八局项目负责人高鸿毅介绍，施工中，建设团队积极运用BIM+GIS 技术搭建三维地质模型，精准掌握隧道变形情况，根据现场实际情况及时调整支护参数，确保施工稳步 推进。 兰合铁路是国家"八纵八横"高速铁路网的重要组成部分，新建正线全长147.42公里，设计时速200 公里。项目建成通车后，将与西宁至成都铁路联通，进一步完善区域铁路网布局，结束甘肃省临夏回族 自治州和甘南藏族自治州不通铁路的历史，对促进沿线地区经济社会高质量发展、巩固脱贫攻坚成果具 有重要意义。 【纠错】 【责任编辑:焦鹏】 ...

Core Insights - The successful completion of the Liuqian Tunnel marks a significant milestone in the construction of the Lanhe Railway, which is a key part of China's national high-speed railway network [1] Company Summary - China Railway Construction Corporation (CRCC) has overseen the construction of the Liuqian Tunnel, which took over three years to complete [1] - The tunnel, located in the Xigu District of Lanzhou, Gansu Province, spans approximately 2462 meters and traverses challenging geological conditions, including water-rich loess and fractured fault zones [1] Industry Summary - The Lanhe Railway, with a total length of 147.42 kilometers and a designed speed of 200 kilometers per hour, is an essential component of the "Eight Vertical and Eight Horizontal" high-speed railway network [1] - The completion of this project will enhance the regional railway network and eliminate the historical lack of railway connectivity in the Linxia Hui Autonomous Prefecture and Gannan Tibetan Autonomous Prefecture of Gansu Province [1]