Abstract The discharge capacity of a tunnel drainage system generally decreases with time because of the hydraulic deterioration of the geotextile filter. Hydraulic deterioration restricts groundwater flow into a tunnel and increases water pressure resulting in detrimental effects on the tunnel lining. Hydraulic deterioration of tunnel drainage system is unique in terms of clogging materials, deterioration mechanism, and flow conditions. Current studies and models investigating the clogging mechanism and hydraulic deterioration are not directly applicable to the geotextile filter of the tunnel drainage system. In this study, a theoretical model of the hydraulic deterioration of tunnel geotextile filter has been proposed considering the mechanical and hydraulic behavior of blinding, clogging and squeezing. A parametric study was carried out to evaluate the performance of the model. An experimental study has been conducted to investigate the clogging behavior of the tunnel drainage system and validate the theoretical model. Several types of clogging materials were selected: cement-leaching calcium oxide, calcium carbonate, iron oxide, and bentonite. Agglutinated clogging was mainly observed during the short-term testing. The findings suggest that the in-plane permeability of the geotextile filter decreased by approximately 90%. The proposed model corroborated the experimental results.

中文翻译：

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隧道排水系统土工布滤料水力劣化建模

摘要 由于土工织物过滤器的水力劣化，隧道排水系统的排水能力通常随时间而降低。水力恶化会限制地下水流入隧道并增加水压，从而对隧道衬砌产生不利影响。隧道排水系统水力劣化在堵塞材料、劣化机理、流动条件等方面具有独特性。目前研究堵塞机制和水力恶化的研究和模型不能直接适用于隧道排水系统的土工织物过滤器。在这项研究中，考虑到堵塞、堵塞和挤压的机械和水力行为，提出了隧道土工织物过滤器水力劣化的理论模型。进行了参数研究以评估模型的性能。进行了一项实验研究，以研究隧道排水系统的堵塞行为并验证理论模型。选择了几种类型的堵塞材料：水泥浸出的氧化钙、碳酸钙、氧化铁和膨润土。在短期测试期间主要观察到凝集堵塞。研究结果表明，土工织物过滤器的面内渗透率降低了大约 90%。所提出的模型证实了实验结果。碳酸钙、氧化铁和膨润土。在短期测试期间主要观察到凝集堵塞。研究结果表明，土工织物过滤器的面内渗透率降低了大约 90%。所提出的模型证实了实验结果。碳酸钙、氧化铁和膨润土。在短期测试期间主要观察到凝集堵塞。研究结果表明，土工布过滤器的面内渗透率降低了大约 90%。所提出的模型证实了实验结果。