Construction Technology Siphon and Inverted Slope Drainage for Water-Rich Tunnels
The Longgang Tunnel on the Kaiyun Expressway,known as the water-rich Tunnel,is excavated from both ends,with a reverse slope drainage system at the outlet work area.During construction,the maximum single-hole water discharge reached 9,072.0 m3/d.According to existing reverse slope drainage technologies,the installation of collecting wells and drainage pumping stations is required,leading to high long-term maintenance costs for reverse slope drainage.This study explores a novel approach utilizing the siphon principle,involving a self-priming drainage system composed of movable collecting tanks,siphon pipes,and external settling tanks.This system significantly reduces the treatment cost of reverse slope.drainage in the water-rich Tunnel and provides valuable reference for similar water-rich tunnel construction projects.
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