On December 6, the "Shengli" TBM at the exit end of the Tianshan Shengli Tunnel in Xinjiang successfully crossed the F7 Ulastai fault crushing zone, which marked another major breakthrough in the construction technology of highland stress and crushing zones of my country's highway tunnels, and accumulated experience for China Communications Construction Expressway to deal with the construction of soft rock suppression and large deformation.
Tianshan Shengli Tunnel is 22.13 kilometers long, with an average altitude of 3,200 meters. It runs across the north and south of the Tianshan Mountains. It is the world's longest expressway tunnel and is also a full-line control project of the Urumqi to Yuli Expressway. The tunnel crosses 16 fault zones in total, of which the F7 fault zone is 4.42km away from the tunnel exit and is about 380m in length. It is a thrust and slip fault. Most of the surface layer is covered by the Fourth System. The upper and lower plates are mainly marble sandy slate, and the core is relatively broken locally. Affected by this fault, the rock mass in the tunnel site is broken and the surrounding rock is poor. It is very easy to cause difficulties such as mud bursting, water inflow, large-scale collapse, TBM card machine, etc. During the crossing process, whether the F7 fault can be safely passed is related to whether the tunnel can be completed as scheduled.
In order to ensure the safe, fast and efficient passage of the F7 fault crushing belt of TBM, the leaders of the China Communications Construction Wuwei Highway Package Project Headquarters commanded and coordinated the dispatch, established a special research team for the F7 fault crushing belt, and held many expert discussion and review meetings, invited a team of academicians and experts to conduct a large number of demonstrations and investigations on key parts of F7, verify the rationality of construction methods, construction technology, and construction processes, and quickly established a scientific construction method. At the same time, for the first time in domestic expressways, the geological and hydrological conditions of the advanced geological horizontal directional drilling was used, combined with the "long-term and short" methods such as TGS and advanced horizontal drilling, accurately identify the geological and hydrological conditions in the F7 area, and further explore the geological surrounding rocks in front of the palm surface , laying a solid foundation for the smooth passage of the F7 fault fracture zone.
During the construction process, the main leaders of the project headquarters often went deep into the construction site to strengthen safety, environmental protection and quality control measures. The leadership team of the on-site construction team took turns to be on duty continuously to promptly solve problems in the process and ensure that management and technology are in place, measures and processes are in place. At the same time, the project also actively carried out targeted tunnel emergency rescue drills, and took the lead in creating the " smart construction site " security management system on the whole line, making full use of the "5G+intelligence+information" integration technology to realize multi-level intelligent monitoring, and forming real-time monitoring of TBM excavation parameters, environmental monitoring, human-vehicle positioning, disaster warning and other data.
China Communications Construction Wuwei Highway Package Project More than 1,000 participating employees fought against the wind and snow without fear of the cold for several months, finally achieving TBM safely and quickly passing through the F7 fault zone, continuing to approach the depths of Tianshan Mountain, creating conditions for the next stage of construction organization.
It is reported that Wuwei Expressway is 318.5 kilometers long and is a transportation trunk line across the Tianshan Mountains and connecting the north and south Xinjiang. It undertakes the mission of the autonomous region and China Communications Construction Group's " Strong Transportation Country " strategic pilot project and the first batch of "Safe Centennial Quality Project Creation Demonstration" project of the Ministry of Transportation. After the project is completed and opened to traffic, the driving time between Urumqi and Yuli will be shortened from the current 7 hours to 3 hours, which is of great significance to promoting the construction of the core area of Xinjiang's "Silk Road Economic Belt" and promoting the economic and social development of northern and southern Xinjiang and the development of regional advantageous resources. (Yao Long, Wang Kun)
Source: Xinhua News Agency Client Xinjiang Channel
