大坪隧道位于云南省曲靖市会泽县境内，全长12.3公里，为Ⅰ级极高风险隧道。据中铁十八局项目现场 技术负责人宁赋岩介绍，隧道地处云贵高原喀斯特地貌区，地形起伏大、岩溶发育，地质构造复杂，施 工过程中面临突泥涌水、软岩大变形、高地应力等复杂多变的地质条件。为攻克长大隧道施工难题，建 设团队采用"长隧短打"模式，通过7个横通道开设9个正洞作业面施工，实现多工序平行作业、有效衔 接，同时利用瞬变电磁、长距离超前钻孔等多种先进技术手段，精准预测岩溶突水突泥风险。 新华社昆明11月25日电 记者从京昆高速铁路西昆公司获悉，11月25日，由中铁十八局承建的渝昆高铁 控制性工程——大坪隧道安全贯通。这一关键节点的突破为渝昆高铁全线建成通车按下"加速键"，标志 着这条连接西南重要城市的高速铁路建设取得重要进展。 随着大坪隧道的贯通，渝昆高铁云南境内隧道已贯通48座，隧道贯通已超90%。目前，渝昆高铁云南段 已全面进入冲刺阶段，每天投入1.4万余名施工人员，1500余台大型机械设备，全力推进重难点工程建 设。 渝昆高铁全长约700公里，其中云南省境内长388.6公里，是云南省内首条设计时速350公里的高速铁 路。渝昆高铁全线建成 ...

渝昆高铁云南段隧道贯通超九成 中新网曲靖11月25日电 (吴栋良)25日，由中铁十八局承建的大坪隧道贯通。至此，渝昆高铁云南段隧道 已贯通48座，隧道贯通已超90%。 图为渝昆高铁大坪隧道建设施工现场。陈畅 摄 大坪隧道位于云南省曲靖市会泽县境内，全长12.3公里，是全线控制性工程，为Ⅰ级高风险隧道。隧道 地处云贵高原喀斯特地貌区，地形起伏大、岩溶发育，隧道穿越2处断层、1处向斜，Ⅳ、Ⅴ级围岩占比 近70%，围岩破碎、稳定性极差，开挖时极易出现塌方等险情，而且地下水丰富，最大涌水量每天达 3.7万立方米。 中铁十八局渝昆高铁项目部现场技术负责人宁赋岩介绍，施工中利用瞬变电磁、长距离超前钻孔等多种 先进技术手段，2次精准预测出岩溶突水突泥风险，顺利通过了1800多米的极高风险段落，平导连续3个 月掘进进度超过200米，为全隧按时贯通奠定了坚实基础。 图为建设者在渝昆高铁大坪隧道内工作。罗扬 摄 从重庆到昆明，渝昆高铁正在加速建设，随着大坪隧道的贯通，渝昆高铁云南段隧道已贯通48座，隧道 贯通已超90%。目前，渝昆高铁云南段全面进入冲刺阶段，每天投入1.4万余名施工人员，1500余台大 型机械设备，全力推进重难点 ...

Core Points - The Yiliang Tunnel right line of the Yukun High-speed Railway, constructed by China Railway Construction Bridge Bureau, has successfully completed its safe breakthrough after over 1460 days of continuous work [1][3] - The tunnel, located in Yunnan Province, spans 24.8 kilometers with a maximum depth of 920 meters, designed in a double-tunnel single-line format [1][3] Construction Progress - The breakthrough of the right line has accurately identified geological conditions, significantly improved ventilation and drainage, and effectively reduced geological risks, enhancing safety and efficiency for subsequent construction [3] - With the completion of the right line, 47 tunnels in the Yunnan section of the Yukun High-speed Railway have been completed, exceeding 85% of the total tunnel work [3] - The Yukun High-speed Railway, approximately 700 kilometers long with a Yunnan section of 388.6 kilometers, is designed for a speed of 350 kilometers per hour, marking it as the first high-speed railway in Yunnan to reach this speed [3] Economic Impact - Once completed, the railway will significantly reduce travel time between Chongqing and Kunming, playing a crucial role in constructing a new development pattern and promoting high-quality economic and social development in the surrounding areas [3]

Core Points - The Yukun High-Speed Railway is a crucial part of China's "Eight Vertical and Eight Horizontal" high-speed rail network, specifically the Beijing-Kunming corridor, spanning approximately 700 kilometers with a design speed of 350 km/h [2][3] - The railway is being constructed in segments, with the Yuyi section (Chongqing West to Yibin) having opened on September 29, 2024, while the Sichuan-Yunnan section (Yibin to Yanjin South) and the Yunnan section (Yanjin South to Kunming South) are under accelerated construction [3][4] Construction Progress - The Yukun High-Speed Railway will reduce travel time from Chongqing to Kunming from the current 5 hours to approximately 2 hours upon completion, with the Chengdu-Yibin High-Speed Railway connecting to form a high-speed corridor with a travel time of around 3 hours between Chengdu and Kunming [3][4] - As of October 8, 2023, all box girders for the Yukun High-Speed Railway Sichuan-Yunnan section have been successfully erected, laying the groundwork for timely completion of the entire railway [3] - The Sichuan-Yunnan section is approximately 95 kilometers long and includes four stations: Yibin, High County, Junlian, and Yanjin South, with the main station works nearing completion and track laying progressing efficiently [4]

Core Viewpoint - The completion of the Sanguoshui Grand Bridge marks a significant milestone in the construction of the Yukun High-Speed Railway, which is expected to enhance transportation efficiency and promote economic development along the route [1][3]. Group 1: Project Details - The Sanguoshui Grand Bridge, located in Yunnan Province's Zhaotong City, features a main span of 168 meters and a total length of 546 meters, making it a large-span high-pier bridge [3]. - The bridge construction faced complex geological conditions due to its location in a mountainous canyon area, presenting significant challenges [3]. - The project utilized advanced construction techniques, including precise measurement and special drilling methods to ensure the stability of the bridge foundation under difficult terrain [3]. Group 2: Technological Innovations - Hydraulic climbing formwork technology was employed for efficient and safe high-altitude operations, ensuring the quality and progress of the pier construction [3]. - An intelligent temperature control system was implemented during the concrete pouring process to maintain the quality of the large-volume concrete [3]. Group 3: Project Significance - With the completion of the Sanguoshui Grand Bridge, the overall bridge construction for the Yukun High-Speed Railway is now 97% complete [3]. - The Yukun High-Speed Railway spans approximately 700 kilometers, with the Yunnan section measuring 388.6 kilometers and designed for a speed of 350 kilometers per hour, making it the first high-speed railway in Yunnan to reach this speed [3]. - Once operational, the railway will significantly reduce travel time between Chongqing and Kunming, contributing to the establishment of a new development pattern and promoting high-quality economic and social development in the surrounding areas [3].

Core Insights - The construction of the Yukun High-Speed Railway has achieved a significant milestone with the successful completion of the San Gu Shui Grand Bridge, a key control project [1][3] Group 1: Project Details - The San Gu Shui Grand Bridge is located in Yanjin County, Zhaotong City, Yunnan Province, featuring a main span of 168 meters and a total length of 546 meters [3] - The bridge construction faced complex geological conditions, requiring extensive collaboration and optimization of design plans among various stakeholders, including China Railway Construction Bridge Bureau [3] Group 2: Project Impact - The Yukun High-Speed Railway spans approximately 700 kilometers, with the Yunnan section measuring 388.6 kilometers, marking it as the first high-speed railway in Yunnan designed for a speed of 350 kilometers per hour [3] - Upon completion, the railway is expected to significantly reduce travel time between Chongqing and Kunming [3]

Core Points - The Bianghui Tunnel, a key project of the Yukun High-speed Railway, has successfully completed its construction, marking it as the first super-long tunnel over 20 kilometers in the southwest region of China [1] - The tunnel, located in Yiliang County, Zhaotong City, Yunnan Province, features a dual-tube single-line design and is classified as a high-risk tunnel due to its complex geological conditions [1] - With the completion of the Bianghui Tunnel, the overall tunnel construction progress in Yunnan for the Yukun High-speed Railway has reached 85%, and over 95% of bridge and tunnel construction has been completed [1] Industry Progress - The Yukun High-speed Railway is entering a critical construction phase, with the main body of the roadbed, bridges, and tunnels nearly completed [1] - The project is now accelerating the construction of the "four electrics" and station building works, preparing to fully enter the ballastless track construction phase [1]

Group 1 - The Yukun High-speed Railway's Binghui Tunnel, measuring 21.17 kilometers, has successfully been completed, marking the first tunnel over 20 kilometers in the entire Yukun High-speed Railway project [1] - The Binghui Tunnel is located in Yiliang County, Zhaotong City, Yunnan Province, and is classified as a high-risk tunnel, making it a key control project for the Yukun High-speed Railway [1] - The Songming Beam Yard, the largest beam yard for the Yukun High-speed Railway, has successfully completed its beam production tasks, laying a solid foundation for subsequent track-laying operations [1] Group 2 - The Songming Beam Yard is equipped with ten beam production platforms and 53 double-layer storage platforms, with a maximum storage capacity of 116 beams, primarily responsible for the prefabrication of 420 box beams [1] - The project team from China Railway Fourth Bureau has implemented a smart beam yard information management system, enhancing production efficiency through mechanization, automation, and intelligent processes [2] - The Yukun High-speed Railway is a crucial part of China's "Eight Vertical and Eight Horizontal" high-speed rail network, which will significantly reduce travel time between Chongqing and Kunming, enhancing transportation convenience in the southwest region and promoting regional economic collaboration [2]

Group 1 - The Beijing Subway Line 22 (Pinggu Line) has completed the construction of the lower bridge structure in the Hebei section, marking a significant milestone in the project [1] - The line is approximately 30 kilometers long and includes 5 stations and 6 sections, which will reduce commuting time from Langfang's northern three counties to Beijing's sub-center to as little as 9 minutes [1] - The construction faced challenges due to complex environmental conditions, including liquefied soil layers, but the project team successfully implemented advanced construction techniques [1] Group 2 - The Ningxia-Hunan ±800 kV UHVDC transmission project has officially commenced operation, representing a key project in China's 14th Five-Year Plan for power development [2] - This project is the first approved UHV transmission corridor primarily for transporting renewable energy from the "Shagehuang" wind and solar base, with a total investment of 28.1 billion yuan [2] - The project enhances Ningxia's external transmission capacity to 20 million kilowatts, significantly improving the region's ability to utilize renewable energy [2] Group 3 - The Yukun High-speed Railway's key control project, the Binghui Tunnel, has successfully been completed, marking the first tunnel over 20 kilometers to be finished on the line [2] - The tunnel, located in Yunnan Province, utilized innovative construction methods to manage complex geological conditions and reduce risks [2] - With the completion of the Binghui Tunnel, 85% of the tunnels in Yunnan for the Yukun High-speed Railway have been completed, which is a crucial part of China's "eight vertical and eight horizontal" high-speed rail network [2]

Core Insights - The construction of the Yukun High-Speed Railway has achieved a significant milestone with the completion of the Binghui Tunnel, which is the first tunnel over 20 kilometers in length along the entire railway line [1][2] - The Yukun High-Speed Railway, part of China's "Eight Vertical and Eight Horizontal" high-speed rail network, spans approximately 700 kilometers, with 388.6 kilometers located within Yunnan Province, and is designed for a maximum speed of 350 kilometers per hour [1][2] Group 1 - The Binghui Tunnel, located in Yiliang County, Zhaotong City, Yunnan Province, is a key control project for the Yukun High-Speed Railway, characterized as a high-risk tunnel due to various geological challenges [1][2] - The construction utilized advanced techniques such as "2 horizontal tunnels + 2 inclined shafts + 1 flat guide" and implemented a multi-faceted defense strategy to manage geological risks, achieving a maximum monthly excavation rate of 135 meters [2] - The completion of the Yukun High-Speed Railway is expected to significantly reduce travel time between Chongqing and Kunming, enhancing transportation convenience in the southwest region and promoting regional economic collaboration [2]