8月27日，经过建设者782天的艰苦奋战，我国"八纵八横"高铁网京昆通道和包（银）海通道的重要组成部分，西渝高铁建设取得重大突破，全线 首个超4公里单洞双线隧道——镇安隧道顺利贯通。 （总台记者 李洪淼 张波俊） 责编：黄之安、陈亚楠 镇安隧道位于重庆市开州区，全长4458米，为单洞双线长隧道，全隧以四级围岩为主，地表沿线埋深浅，积水易渗透，岩层自稳性极差，尤其是 进口洞口边坡陡峭，线路左侧存在沟溪，右侧高陡边坡存在偏压，给现场施工带来较大难度。 建设过程中，施工方中铁七局采用地质雷达"透视"岩层，用长距离超前钻孔"探路"，提前预判可能出现的不良地质段，为施工方案的调整提供了 科学依据。并且结合现场地质条件，优化隧道支护、工法的设计方案，实现"岩变我变"，保障隧道施工安全，加快了施工进度，确保了隧道按期 贯通。 西渝高铁康渝段正线全长478公里，设计时速350公里，自安康西站起，经陕西省安康市，重庆市城口县，四川省达州市、广安市，重庆市合川 区、北碚区，引入重庆枢纽重庆西站。建成通车后，将与已投运的成都至重庆高铁、郑州至重庆高铁和在建的重庆至昆明高铁、西安至延安高 铁、西安至十堰高铁等多条线路连通，推动中西部 ...

Core Viewpoint - The construction of the Xiyu High-speed Railway, an important part of China's "Eight Vertical and Eight Horizontal" high-speed rail network, has made significant progress with the successful completion of the Miaojialiang Tunnel, which is 1285 meters long, marking a key milestone for the project [1] Group 1 - The Xiyu High-speed Railway is a crucial component of the Jingkun and Baoyin-Hai corridors [1] - The construction team from China Railway 12th Bureau has worked for 683 days to achieve this breakthrough [1] - A total of 28 tunnels have been completed in the Kangyu section of the Xiyu High-speed Railway, laying a solid foundation for the timely operation of the entire line [1]

Core Viewpoint - The construction of major projects in Sichuan during the "May Day" holiday is crucial for stabilizing economic growth and promoting high-quality development, with significant investments and progress reported across various sectors [1][4]. Group 1: Major Projects and Investments - The China (Mianyang) Science and Technology City Nuclear Medical Health Industry Park has a total investment of approximately 18.6 billion yuan, with an expected annual output value exceeding 50 billion yuan upon completion [1]. - In the first quarter of this year, Sichuan completed investments of 245.53 billion yuan in 810 provincial key projects, achieving an annual investment completion rate of 31% [4]. Group 2: Infrastructure Development - The Yukun High-speed Railway's key project, the Ma'anshan Tunnel, successfully passed through during the holiday, with strict safety measures in place to ensure zero accidents [1]. - The Xiyu High-speed Railway's Xiangyang No. 1 Tunnel has reached its designed length of 12.766 kilometers, with over 150 workers dedicating their holiday to advance the project [3]. Group 3: Renewable Energy Initiatives - The first grid-connected energy storage power station in Sichuan, the Aba Hongyuan Anqu Phase I Photovoltaic Project, is on track to achieve full capacity grid connection by May 15, with an expected annual power generation of 450 million kilowatt-hours [3].

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 - The completion of the box girder prefabrication task for the Xi'an to Shiyan high-speed railway marks a significant milestone in the project, with a total of 698 box girders being prefabricated at the only precast yard located in Lintian County, Xi'an [2] - The Xi'an to Shiyan high-speed railway is a crucial part of Shaanxi's high-speed rail network, featuring a total length of 255.7 kilometers and a design speed of 350 kilometers per hour, with five stations along the route [2] - The successful use of the first set of hanging baskets for the construction of the Lanhhe Grand Bridge on the Xiangyu high-speed railway indicates a breakthrough in bridge construction, which is a key challenge in the project [3] Group 2 - The Lanhhe Grand Bridge spans 674.15 meters with a maximum span of 112 meters, featuring piers that exceed 40 meters in height, with the tallest pier reaching 97 meters [3] - The Xiangyu high-speed railway is an important component of China's high-speed rail network, expected to reduce travel time between Xi'an and Chongqing from approximately 6 hours to about 2.5 hours upon completion [3] - The construction of the Xi'an East Station, a major transportation hub, is progressing with the installation of the first box girder, which is part of a larger project that will significantly increase passenger capacity [4] Group 3 - The Xi'an East Station will cover a total area of 394,000 square meters and is expected to handle an annual passenger volume of 36.5 million, alleviating pressure on the Xi'an railway hub [4] - The construction of the Meitai Expressway is underway, with the road surface engineering starting, which is crucial for the completion of the entire expressway [4] - The Meitai Expressway, spanning approximately 75.4 kilometers, will enhance connectivity between the Guanzhong and southern Shaanxi regions, promoting high-quality regional economic development [5]