Author(s): Chenxi Ouyang; Zhigao Zhao; Chengpeng Liu; Xiuxing Yin; Jiandong Yang
Linked Author(s): Zhigao Zhao
Keywords: Water diversion tunnel Drainage process Dynamic characteristics Gas-liquid interface Mathematical model
Abstract: In long-distance water diversion projects, extra-long pressure tunnels are increasingly important due to their flexible axis arrangement, ample cross-section, and significant discharge potential. However, during the water drainage process of these tunnels, gas is rapidly stretched in the initial phase, and if it is not promptly replenished from the ventilation shafts, negative pressure may develop, leading to drastic changes in flow patterns. Consequently, studying hydraulic evolution characteristics and control strategies during the drainage process is crucial for the safe and stable operation of extra-long pressure tunnels. This paper establishes a rigid and elastic coupling water column model to examine the complex hydraulic transition process, using a follow-up project for China’s South-to-North Water Diversion Project as a case study for numerical analysis. It analyzes hydraulic evolution characteristics under various operating conditions and explores gate opening and closing control strategies, providing theoretical foundations and technical support for the construction and operation of water diversion projects.
Year: 2025