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对于排水型隧道,设计时通常采用折减系数或者完全不考虑衬砌结构所承受的水压力,当排水系统发生堵塞后,过大的水压力会威胁到隧道衬砌结构的安全。本文结合青岛胶州湾海底隧道可维护性排水系统工程实例,研究了排水系统发生堵塞后,衬砌背后升高的水压力对二次衬砌结构的影响。深入分析了隧道排水系统发生堵塞的影响因素,结合当前防排水材料及维护设备的技术现状,提出了可维护性排水系统的设计方法及施工技术要求,并讨论了排水系统的维护方法。为以采用排水方案为设计原则的地下工程提供设计参考。
For drainage tunnels, the design factor usually adopts the reduction coefficient or does not consider the water pressure of the lining structure. When the drainage system is clogged, excessive water pressure will threaten the safety of the tunnel lining structure. Based on the example of maintainable drainage system in Qingdao Jiaozhou Bay Submarine Tunnel, this paper studies the effect of water pressure rising behind the lining on the secondary lining after the blockage of the drainage system. The influential factors of blockage in tunnel drainage system are analyzed in depth. Based on the current technical status of drainage and drainage materials and maintenance equipment, the design methods and technical requirements of maintainable drainage system are proposed. The maintenance methods of drainage system are discussed. Design guidelines for underground engineering using drainage schemes as design principles.