穿越断裂破碎带双洞单线隧道反坡排水设计及应用OA

Based on the engineering geological conditions and hydrological data of a double-tube single-track tunnel crossing fractured and broken zones,this study conducted a systematic design research on counter-slope drainage systems.Through scientific prediction of tunnel water inflow,the maximum water inflow for each construction zone was calculated by comprehensively considering construction zoning,gradient variations,and water inflow characteristics.On this basis,optimal selections for pump head,flow rate,and pipe diameter were performed.Results show that,the designed counter-slope drainage system effectively handles extreme conditions with a maximum water inflow of 1 753 m3/h during the wet season;the pump head and pipe diameter configurations are scientifically rational,the drainage capacity fully meets construction safety requirements,and the system operates stably and reliably,ensuring the smooth progress of tunnel construction.