引大入秦工程盘道岭隧洞病害分析及加固方案

Geological disease analysis and reinforcement scheme for Pandaoling Tunnel along the main canal of Datong River-Qinwangchuan Water Diversion Project

盘道岭隧洞地层岩性复杂,地质条件恶劣,通水运行至今,几经大的加固处理,目前洞内仍多处存在安全隐患,如多处侧墙和拱顶有新裂缝出现,原裂缝有发展变化趋势,隧洞洞壁大量渗水,侧墙纵缝有析出物。本次加固采用现浇钢筋混凝土衬砌,设置排水管导引至隧洞底部,安全隐患的洞段得到加固,裂缝和渗水得到有效处理,且糙率降低,过水能力满足过流能力,存在的问题都基本得到了解决。

The formation lithology is complex and the geological condition is bad in Pandaoling Tunnel.Several large reinforcement treatments have been done since operation till operation.However,there are still many hidden dangers in the cave:for example,new cracks appear at quite a lot of side walls and vaults,there is development trend in the original cracks,tunnel cave walls suffer from serious water penetration,and precipitations appear at side wall longitudinal seams.The tunnel is reinforced with cast-in-situ reinforced concrete lining this time.A drain-pipe is set for leading to the bottom of the tunnel.Holes with security hazards are reinforced,thereby effectively handling cracks and water penetration,and lowering the roughness.The water penetration ability meets the flow ability.All the problems have been solved.