Abstract: The current active control waterproof and drainage system was difficult to achieve dynamic control of water inflows and pressure, which could lead to tunnel cracking and leakage, a pressure valve was installed at the circumferential drainage blind pipe in order to control the water inflow and water pressure. Additionally, the formula for calculating the tunnel water inflow was derived. Using the conformal transformation, the seepage field formula of the surrounding rock was derived from the basic differential equation of the stable seepage field. The tunnel seepage calculation model was further established, incorporating the parameters of circumferential drainage blind pipe spacing and discharge pressure.The calculation formula of tunnel drainage volume and external water pressure of the external water pressure of secondary lining and tunnel water inflow calculation formula was obtained.The decomposition and numerical simulation techniques confirmed the analytical solution's reasonableness.This served as the foundation for the establishment of a tunnel drainage design solution with a pressure valve. The findings indicated that the water pressure and flow rate were significantly impacted by the geotextile permeability coefficient and the spacing between drainage pipes. It was recommended to select a geotextile which permeability coefficient of at least 500 μm/s, and the spacing between drainage blind pipes could be adjusted based on the drainage pressure. The grouting ring thickness could be decreased by adding a pressure valve in comparison to the current active control waterproof and drainage.
纪禄凌,游玮,李晓逸,曾原驰,刘毓氚,张铠. 增设压力阀对隧道防排水影响[J]. 隧道与地下工程灾害防治, 2024, 6(3): 92-102.
JI Luling, YOU Wei, LI Xiaoyi, ZENG Yuanchi, LIU Yuchuan, ZHANG Kai. Influence of incorporating valve pressure on the tunnel waterproof and drainage. Hazard Control in Tunnelling and Underground Engineering, 2024, 6(3): 92-102.
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2024, Vol. 6 
