铁路桥涵顶进中的排水与降水是直接影响工程质量和行车安全的重要问题。当桥涵底板处于地下水位以下时,施工时因含水层被切断,以及地下水头的压力,使地下水从两侧坑壁流出,或从基底上涌,致使路基土壤泡水而变软,特别是粒径细小的砂质土填筑的路基,当地下水位较高时,因地下水自下而上的渗流,土颗粒将随渗流的水一起流动,形成 Drainage and precipitation of the railway bridge and culvert jacking are important issues that directly affect the project quality and traffic safety. When the floor of the bridge and culvert is below the groundwater level, the aquifer is cut off and the pressure of the underground water head during construction causes the groundwater to flow out from the pit walls on both sides or from the base so that the subgrade soils into water and softens, in particular, Subgrade filled with fine sand soil, the local water table is high, due to groundwater bottom-up seepage, soil particles will flow along with seepage water to form