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| Influence of incorporating valve pressure on the tunnel waterproof and drainage |
| JI Luling1,2, YOU Wei1, LI Xiaoyi1, ZENG Yuanchi2, LIU Yuchuan2*，ZHANG Kai3
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(1. Xiamen Road & Bridge Construction Group Engineering Co., Ltd., Xiamen 361000, Fujian, China;
2. School of Civil Engineering, Fuzhou University, Fuzhou 350000, Fujian, China;
3. Xiamen Jiehang Engineering Testing Technology CO., Ltd., Xiamen 361000, Fujian, China）
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Abstract Due to the inadequacies of the current tunnel active control waterproof and drainage system, 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.
Keywords：tunnel engineering|tunnel drainage system|groundwater pressure|water inflow|analytical solution
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Received: 19 February 2024
Published: 23 May 2024
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