青岛胶州湾海底隧道可维护性排水系统研究

Study on Maintainability Drain System of Jiaozhouwan Sub-sea Tunnel in Qingdao

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 the drainage-type tunnels,usually the water pressure on lining is not considered or the reduction factor is used.The excessive water pressure will do destruction to the lining once the drainage system is clogged.On the basis of maintainable drain system of Jiaozhouwan sub-sea tunnel in Qingdao,this paper deals with the second lining influenced by excessive water pressure once the drainage system is clogged.After analysis on clogged factors of tunnel drainage system and investigation on current drainage materials and maintenance equipment,we proposed drain system design method and technical requirement for its construction,then the maintenance method of the maintainable drain system is discussed.