On December 23rd, with the huge cutterhead of the "Grassland Ruyi" TBM (full-section tunnel hard rock boring machine) broke out of the rock in the water conveyance tunnel section of the throat control project of the Xujiliao Project, with a total length of 173The 757-kilometer water conveyance tunnel has been completed in its entirety, and the project has been fully completed and opened to water, which has taken a key step.
The tunnel section of the water conveyance project is fully connected to the activity site.
The project is one of the 172 major water conservancy projects for water conservation and water supply during the 13th Five-Year Plan period, which is the backbone project of the national water network and the largest water conservancy project in the Inner Mongolia Autonomous Region so far. The project is composed of two major parts, the Wendegen Water Conservancy Project and the Water Transmission Project, which diverts water from the Yuer River, a tributary of the right bank of the Nenjiang River, to Tongliao City in the lower reaches of the West Liao River, and supplies water to cities and industrial parks along the route, combined with irrigation and comprehensive utilization of power generation, with a total length of 390 water transmission lines263 kilometers, of which 173 are water conveyance tunnels757 km, covering an area of 740,000 square kilometers, benefiting more than 300,000 people in 8 banner counties and cities along the line.
The tunnel section of the water conveyance project is fully connected to the activity site.
The water conveyance project of the Liao Water Diversion Project is like a blue Hada, with the mountains as the side face, passing through the land of eastern Mongolia. The tunnel project is a key line project of the Liaoning Diversion Project, which controls the construction period of the entire project. The tunnel has a total of six sections, crossing many rivers and valleys such as the Shabaltu River, the Chaganmulun River, and the Huerle River, and will be completed from September 2018 to December 2023, with more than 1,900 days and nights and more than 10,000 builders participating in the construction.
The geological structure of the tunnel area is complex and fractured is developed, the local surrounding rock changes frequently, and the groundwater is obviously recharged by the surface, which has the typical characteristics of shallow burial and rich water. In view of the characteristics of the water conveyance tunnel project spanning a number of rivers and gullies, shallow burial, rich water, obvious surface recharge of groundwater, complex geological structure, frequent changes in geological conditions, etc., as well as the difficulties of hindering the tunneling of the tunnel project, the difficulty of concrete construction quality assurance and the reduction of construction efficiency due to the large water inflow in the tunnel, the company and the participating parties actively and seriously explored, summarized and put forward the implementation principles of fine detection, fine grouting and fine excavation, and successively adopted advanced geological forecasting, surface grouting, A series of measures such as water blocking in the cave;At the same time, it has strengthened scientific and technological assistance, strengthened scientific research, and successively organized well-known domestic institutes such as the Chinese Academy of Water Sciences, Shandong University, and the Yellow River Design Company to carry out scientific research tests and technical research under complex geological conditions, such as advanced geophysical prospecting, groundwater attachment to the environment, and water-blocking grouting inside and outside the tunnel, and condensed the materials, measures and timing suitable for the water-blocking inside and outside the tunnel under the geological conditions, providing guarantee conditions for tunnel excavation and concrete lining.
Workers check the TBM status after the tunnel is breached.
During the construction process, the participating units overcame the impact of the three-year epidemic on the entry of personnel, materials and equipment, overcame the adverse geological impacts such as water-richness, water inflow, faults and large deformation of soft rock, carried forward the spirit of hard work, unity and hard work, and fought bravely, and achieved a single-day tunneling of the same level TBM in China12 meters, a monthly footage of 1380 meters, a single unit for 5 consecutive months of more than 1,000 meters record. The tunnel was broken through on September 3, 2021, January 4, 2022, November 1, 2023, and December 6, 2023.
For the first time, the water conservancy system of Inner Mongolia adopts the most advanced large-scale intelligent tunnel hard rock excavation equipment TBM, which integrates hard rock excavation, slag removal, support and other construction processes, with fast excavation speed, environmental protection and high comprehensive benefits, which effectively guarantees the construction safety, project quality and construction progress of the project. The tunnel section of the water conveyance project to achieve the node goal of the whole line is connected, which not only marks a big step forward in the construction of the water diversion project, but also marks a breakthrough success in the history of water conservancy construction in Inner Mongolia Autonomous Region independently developed and produced by China.
The tunnel section of the water conveyance project was completed in its entirety, and the workers took a group photo.
Photo: Liang Jian).