The new baishatuo tuo long tunnel of fuxiu second line of yuhuai railway was successfully completed

Recently, chongqing (chongqing) huai (huaihua) railway fuxiu second line railway new baishatuo tunnel smoothly completed.

It is understood that the second line construction project of fuling to meijiang section of yuhuai railway is an important construction project of national medium - and long-term railway network planning. Xinbaishatuo tunnel, the only control project in the whole line, lies in fuling, chongqing, which is known as "wujiang nature insurance". The tunnel is 10.004 kilometers long, with a maximum buried depth of 600 meters and a minimum depth of 4.5 meters.

According to the introduction, the geological structure of the tunnel under construction is very complicated, and the karst is developed strongly. Limestone, soil layer, karst breccia, shale, coal seam, fault breccia and bedrock fissure water occur successively, which is easy to collapse, settlement, rockfall, water gushing and mud protruding disaster, and the safety risk is extremely high. Among them, the tunnel body passes through the geological structure belt for 8 times, and there are 12 gas coal seam sections with accumulative length of 3100 meters, which brings great challenges to the construction safety.

It is reported that since April 10, 2016, the official entry into the tunnel construction, construction units to mechanization, information as a springboard, automation, factory, centralized as the booster, in the construction process, actively explore the use of new technology, new tooling, high gas tunnel safety monitoring and other innovative measures. It has changed the traditional tunnel construction method and technology, greatly reduced the labor input and labor intensity, ensured the construction efficiency and quality, and reduced the safety risk.

In view of the high risk characteristics of the tunnel, the construction unit has introduced access control, automatic gas monitoring, personnel positioning system inside the tunnel, using special coal safety and explosion-proof mechanical and electrical equipment, the establishment of gas concentration automatic and manual inspection chain monitoring mechanism, the implementation of tunnel professional ventilation management, to ensure the safety of the construction personnel.

chongqing railway secondary predominantly freight, passenger line, the design speed of 120 kilometers of the national class I railway, the railway has been incorporated into the national medium and long-term railway network planning adjustment (2008) ", "national railway 12th five-year development plan" and "the wuling mountain area regional development and poverty alleviation works planning (2011 ~ 2020)," the planning and construction of projects.