新华社北京1月25日电（记者樊曦）记者25日从中铁十四局集团了解到，历经1200余天艰苦奋战， 天陇铁路全线重难点控制性工程马街隧道顺利贯通，为全线按期通车奠定坚实基础。 【纠错】 【责任编辑:焦鹏】 天陇铁路北起甘肃省天水市，南至陇南市，新建正线全长约208公里，设计时速160公里。其中，马 街隧道地处秦巴山区，全长12.4公里，为一级高风险特长隧道。隧址区地质构造复杂、断裂发育，洞身 穿越千枚岩、泥砂岩等多种软弱岩层，四级、五级围岩占比高达96%。 据中铁十四局项目负责人朱耀璋介绍，隧道最大埋深1160米，最小仅31.6米，高地应力、大变形、 偏压、沉降等风险交织，施工难度大。建设过程中，项目团队创新采用"长隧短打"策略，设置两座斜井 和一处横洞，施工高峰期最多6个作业面同步推进，同时依托超前地质预报、智能监测平台、三维激光 扫描等技术手段，动态监控施工全过程，确保隧道顺利掘进。 天陇铁路是国家中长期铁路网规划重点项目，也是甘肃省第一条自主投资建设的铁路，为客货兼顾 的区域铁路干线。全线建成通车后将与陇海铁路、兰渝铁路连接，成为打通甘肃南向通道、提升西部陆 海新通道运能的重要一环。 ...

Core Viewpoint - The successful breakthrough of the Pingluo Tunnel, a key control project of the Tianlong Railway, marks significant progress in its construction, laying a solid foundation for the tunnel's full completion [1] Group 1: Project Overview - The Pingluo Tunnel has a total length of 15,032 meters and traverses the complex terrain of the Western Qinling Mountains, with a relative height difference of 100 to 300 meters and a maximum burial depth of approximately 650 meters [1] - The Tianlong Railway connects Tianshui City and Longnan City in Gansu Province, serving as a rapid railway line that accommodates both passenger and freight transport [1] Group 2: Construction Challenges and Techniques - The geological conditions of the tunnel are complex, presenting significant construction challenges [1] - The project team implemented a rigorous quality and safety control system, utilizing advanced technologies such as geological radar scanning and advanced geological drilling to ensure safe excavation and controllable processes [1] Group 3: Strategic Importance - Upon completion, the Tianlong Railway will connect with the Lanzhou–Lianyungang Railway and the Lanzhou–Chongqing Railway, becoming a crucial part of the southern passage in Gansu and enhancing the capacity of the new western land-sea corridor [1]

Core Points - The completion of the last blasting operation marks the breakthrough of the Xujiaping Tunnel, the first long tunnel of the Tianlong Railway, which is a significant milestone for the railway's construction [1][3] - The Tianlong Railway, connecting Tianshui and Longnan, is part of Gansu Province's "14th Five-Year" comprehensive transportation development plan and is the first fully self-funded and constructed single-line passenger and freight railway in the province [3][4] - The project, undertaken by China Railway Fourth Bureau, features a total length of 17.97 kilometers, with the Xujiaping Tunnel measuring 16.27 kilometers and reaching a maximum depth of 600 meters [3][4] Construction Management - A "three-level linkage" management mechanism has been established to coordinate design, construction, and monitoring, ensuring safety and quality through regular expert evaluations and targeted management measures [3][4] - The construction team follows strict principles including advanced monitoring, reinforcement, and support to ensure safe and efficient tunnel excavation [4][6] Technological Advancements - The project employs advanced technologies such as TSP geological forecasting systems and geological radar, completing over 200 rock monitoring sessions and issuing early warnings for 47 risk areas [6] - The use of energy-accumulating blasting technology and various construction methods has increased the average excavation rate from 7 meters to 8 meters per day, enhancing construction efficiency by approximately 20% [6] Strategic Importance - The Tianlong Railway, with a total length of 208.207 kilometers and a design speed of 160 km/h, will connect with the Longhai Railway and Lanzhou-Chongqing Railway, playing a crucial role in enhancing the transportation capacity of the western land-sea new corridor [6]

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]

Group 1: Railway Construction Progress - Multiple railway construction projects across various provinces are actively ongoing during the "May Day" holiday, showcasing the commitment of construction workers to maintain progress and quality [1][2][5][8] - The Tianlong Railway's Baiyangli Tunnel in Gansu is nearing completion, with a total length of approximately 6.1 kilometers, and is a key project in Gansu's "14th Five-Year" railway development plan [1] - The Binhai Dong Yellow River Bridge in Shandong, part of the Tianjin-Weifang High-Speed Railway, spans over 42 kilometers and is crucial for enhancing connectivity in the Bohai Rim region [2] - The Xiongxin High-Speed Railway in Hebei has completed over 1,700 box girder installations, achieving 70% of its total task, which will improve the high-speed rail network in the Beijing-Tianjin-Hebei area [2] Group 2: Key Infrastructure Projects - The Wuhuo Bridge on the Pingluozhou High-Speed Railway in Henan is over 33 kilometers long and presents significant construction challenges, aimed at enhancing regional transportation [5] - The Ankang Hanjiang Bridge in Shaanxi, part of the Kangyu High-Speed Railway, is notable for being the largest single-span steel-concrete arch bridge for high-speed rail in China, with over 40% of the main arch installation completed [5][6] - The Yujialiang Tunnel, a critical component of the Kangyu High-Speed Railway, has achieved over 5,000 meters of excavation, addressing complex geological challenges [6] - The Yichang-Fengjie High-Speed Railway in Hubei is progressing with the Longling Tunnel, which is over 11 kilometers long and will significantly reduce travel time between Yichang and Chongqing [6] - The Qujiang Bridge on the Qu-Li Railway in Zhejiang is a key engineering challenge, with a total length of approximately 10.59 kilometers [6] Group 3: Logistics and Infrastructure Development - The Shenzhen Pinghu South Comprehensive Logistics Hub project is advancing with over 2,000 workers on-site, expected to complete all steel structure work by the end of May, covering a total area of 1.11 million square meters [8]