People.cn (603000) 中国经济网·2024-12-31 06:01Project Overview - The Tianshan Shengli Tunnel, the world's longest highway tunnel, was fully completed, reducing the travel time through the Tianshan Mountains from 3 hours to approximately 20 minutes [1] - The tunnel is a significant milestone in China's efforts to accelerate the construction of a transportation powerhouse, representing a major achievement in highway tunnel construction [2] Construction Challenges and Innovations - The tunnel traverses 16 geological fault zones, with 12 located at the entrance end, characterized by complex rock layers and fragile geology, with maximum ground stress reaching nearly 22 MPa [3] - The construction team overcame challenges such as mud surges and rock bursts by installing over 37,800 polyethylene foam concrete pipes to create a 70 cm thick shock-absorbing layer, successfully crossing the F6 Boa Fault Zone in 80 days [3] - Traditional drilling and blasting methods would have required 72 months, but the use of hard rock tunnel boring machines (TBMs) reduced the construction period to 52 months, with a maximum daily progress of 20-30 meters, five times faster than manual excavation [4][5] - The project pioneered the use of TBMs in domestic highway tunnel construction and introduced the "three tunnels + four shafts" construction method, achieving rapid excavation and saving construction time [6] Technological and Engineering Breakthroughs - The "Tianshan" and "Shengli" TBMs were deployed simultaneously from the north and south sides of the Tianshan Mountains, with the "Tianshan" TBM successfully crossing a granite fault alteration zone after 14 months of攻坚 [7] - The project team developed a "main tunnel + central pilot tunnel" excavation scheme, using domestically developed TBMs to create multiple working faces, enabling simultaneous operations and further reducing construction time [10] - A digital monitoring and command center was established to manage over 1,200 personnel and 600-700 vehicle trips daily, utilizing intelligent traffic scheduling systems, vehicle positioning systems, and electronic access control systems to ensure safety and efficiency [11] Ventilation and Environmental Solutions - The project implemented a three-tunnel, long-distance construction ventilation method, reducing the required fan power from 8,700 kW to 2,400 kW, effectively solving the ventilation challenges of extra-long tunnels while achieving energy savings and emission reductions [12] - Four ventilation shafts were constructed, with the deepest reaching over 700 meters, making them the deepest highway ventilation shafts in the world, utilizing advanced equipment and techniques to overcome extreme environmental conditions [12][13] Team and Equipment - The construction team faced numerous challenges, including water inflows and extreme temperatures, with one incident requiring 39 days of continuous effort to resolve a sudden water surge at a depth of 570 meters [13] - The project developed the "Chuangshouhao," the world's first ultra-large and ultra-deep shaft equipment for high-altitude and cold environments, to facilitate the excavation of the ventilation shafts [13]