en.Wedoany.com Reported - The No. 2 tailrace tunnel of the Jiangshan Pumped Storage Power Station in Zhejiang, China, recently completed its final blasting operation, achieving a safe and precise breakthrough. This tunnel serves as a key passage connecting the underground powerhouse and the lower reservoir, and its breakthrough creates conditions for subsequent electromechanical equipment installation and grid-connected power generation.
The Jiangshan Pumped Storage Power Station has a total installed capacity of 1,200 megawatts and a designed annual power generation of 1.44 billion kilowatt-hours. It is a core energy storage support project for the western Zhejiang power grid and a significant project for optimizing the energy structure and enhancing grid regulation capacity in Zhejiang Province.
The No. 2 tailrace tunnel handles the bidirectional water conveyance functions of power generation drainage and pumping water intake. The construction area features complex geological conditions, requiring passage through multiple fracture zones and soft rock strata, with risks of water inflow, collapse, and deformation. The project team employed smooth blasting techniques to control overbreak and underbreak, introduced an intelligent monitoring system for real-time sensing of surrounding rock deformation and seepage pressure, implemented advanced geological forecasting and dynamic support design, and established a closed-loop management system of "monitoring—warning—response." Through scientific scheduling of procedures, 24-hour shift operations, and enhanced safety education and on-site supervision, the team completed the breakthrough ahead of the planned schedule while ensuring safety and quality.
The tunnel breakthrough provides working surfaces and time margins for subsequent lining concrete pouring, underground powerhouse equipment installation, and construction of the lower reservoir intake and outlet. The project team has transitioned to tunnel lining and metal structure installation procedures, advancing refined and standardized construction.
Once completed and operational, the project will undertake tasks such as grid peak shaving, valley filling, frequency regulation, phase modulation, and emergency backup, enhancing the new energy integration capacity of western Zhejiang and the entire province. It is expected to save approximately 480,000 tons of standard coal and reduce carbon dioxide emissions by about 1.2 million tons annually.
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