拱北隧道明挖段变形缝防水构造优化研究

摘要

通过对现行设计规范和明挖隧道工程案例的调研,文章总结了变形缝防水做法和设置依据;在变形缝防水以"堵排结合"为原则的基础上,对于临海隧道和水下隧道,采用可排式变形缝止水带,可以增强防水效果.结合拱北隧道明挖段工程地质条件和防水要求,将可排式止水带结构运用于变形缝防水中,并在隧道内侧设计排水管道连接,以作为渗漏水的排水路径,该优化设计对工程实践有一定的指导意义.%In light of the investigation of current design specifications and open-cut tunnel projects, the waterproof construction method and theory of deformation joints are summarized. Based on the principle of combination of wa-ter blocking with draining for the deformation joints, a drainable waterstop may be used to enhance water tightness for tunnels near the sea as well as for submerged tunnels. Considering the geological conditions and requirements for the open-cut section of the Gongbei tunnel, a drainable waterstop may be used for the waterproofing of deformed joints, and a drain pipe junction is designed for the inner side of the tunnels and used as the drain path for leakage water.