城市水下明挖隧道排水系统设计要点探讨

Discussion on Design Essentials of Drainage System for Urban Underwater Open-cut Tunnel

摘要:

安全可靠的排水系统是隧道防灾及正常通行的重要保证。然而，对于城市水下隧道排水系统，国内尚无统一且完善的规范、指南及其他相关设计要求。因此从城市水下明挖隧道排水系统的组成及特点出发，梳理现行规范及指南中关于隧道排水的设计要求，在此基础上提出与之配套的设计原则及设计标准，分析总结出严格控制汇水范围、完善雨废收集系统、增强隧道排水韧性、切实保障排水出路及提高泵房防淹能力等5个设计要点，以期为城市水下明挖隧道排水系统的设计提供设计指引和技术支持。

关键词:下穿隧道;水下隧道;隧道排水;内涝防治;排水泵站

Abstract:

The safe and reliable drainage system is an important guarantee for the disaster prevention and normal traffic of tunnel. However, for the urban underwater tunnel drainage system, there are no uniform and perfect specifications, guidelines and other related design requirements in China. Therefore, starting from the composition and characteristics of the urban underwater open-cut tunnel drainage system, the design requirements of tunnel drainage in the current specifications and guidelines are sorted out. On the basis of this, the corresponding design principles and standards are proposed. Five design essentials have been summarized, such as strictly controlling the scope of catchment water, perfecting the rainwater and wastewater collection system, enhancing the tunnel drainage toughness, effectively ensuring the discharge outlet and improving the flood prevention capacity of the pump house in order to provide the design guidelines and technical support for the design of urban underwater open-cut tunnel drainage systems.

Key words:underpass tunnel; underwater tunnel; tunnel drainage; waterlogging prevention