[Commentary] On July 9, with the last successful blasting, the Hongdou Mountain Tunnel, the key project of the Yunnan Dali (Cang) Railway line, was successfully opened, marking China’s first and the world’s rarest tunneling of toxic and harmful gases. The difficulties were successfully solved, laying a solid foundation for the opening of the Dalin Railway on schedule.
【Explanation】Hongdou Mountain Tunnel is located in Lincang City, Yunnan Province, with a total length of 10,616 meters. It is the only one encountered in the construction of China's railways. It contains 8 kinds of toxic and harmful gases, large-scale long-distance large-scale gushing water, high ground temperature, and long paragraphs. Long tunnel with granite alteration. The tunnel is adjacent to the Lancang River and surrounded by mountains. The geographical environment is complex and the construction is very difficult.
[Same period] Quan Fei, Deputy Chief Engineer of China Railway Tenth Bureau Dalin Railway Project Department:
The reason why Hongdou Mountain Tunnel is called the world's rare'poison gas' tunnel is because it has the most types, the highest concentration, and the greatest degree of harm. The Hongdou Mountain Tunnel has a highly hazardous area of 4,210 meters and a highly dangerous area of 3,630 meters. , Is that every digging one meter is full of unknowns and challenges.
【Explanation】In June 2017, 8 kinds of toxic and harmful gases such as hydrogen sulfide and carbon dioxide were found in the tunnel. Because there is no construction experience to learn from, the construction unit has invited many well-known experts in the petroleum, coal mine and other industries to the site for surveys to study the harmful gases. The treatment plan, after repeated verification, has formed a set of control standards and construction methods for a variety of harmful gases, which successfully solved the tunnel construction problems.
[Same period] Quan Fei, Deputy Chief Engineer of China Railway Tenth Bureau Dalin Railway Project Department:
The construction difficulties of Hongdoushan Tunnel are unique, unique and unreproducible. At present, through continuous efforts, 4 construction methods have been formed, and more than 40 patents are being developed and are being declared. Among them, the research results of "toxic and harmful gas deliming water smooth blasting technology" and "harmful gas rapid detoxification technology" and "harmful gas automatic monitoring relay transmission system" have been unanimously praised by people in the industry.
[Commentary] Faced with the complex geological conditions of the tunnel, the West Yunnan Railway Construction Headquarters organized all parties involved with "resource allocation, construction method optimization, process management" as the core, focusing on advanced geological forecasting, monitoring and measurement and early warning information management, Ensured the smooth passage of Hongdou Mountain Tunnel.
[Same period] Chen Yingwu, commander of the Dalin section of the West Yunnan Railway Construction Headquarters:
In order to improve the key projects of the railway network in western China, the construction of the Dalin Railway is progressing in an orderly manner, especially the penetration of the Hongdou Mountain Tunnel, which has created favorable conditions for the Dalin Railway to lay tracks.
[Explanation] Dali Railway starts from the north of Dali Railway Station and crosses the Lancang River from Dali Prefecture to Lincang City. The total length of the line is 202 kilometers and the design speed is 160 kilometers per hour. After it is completed and opened to traffic, it will end the history of Lincang city without railways, and promote the interconnection between China and neighboring countries.
Dao Zhinan, Wang Yixiang, He Shuting, Lincang, Yunnan
Editor in charge: [Liu Xian]