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小浪底水电站采用首部式地下厂房。通过水力设计及工程效益比较，确定采用明流尾水洞。从尾水闸门室至尾水明渠，地质条件复杂，洞室跨度大，边墙高。设计中，对尾水洞出口段、穿越公路的浅埋洞段以及尾水叉洞段按不同方法进行分析计算，提出了相应支护形式和支护参数，采用钢筋网喷混凝土、锚杆与薄混凝土组合式衬砌，保证了洞室的稳定。
Xiaolangdi Hydropower Station with first-class underground plant. Through the hydraulic design and engineering efficiency comparison, determine the use of Mingliu tail water hole. From the tail gate gate to the tailrace, the geological conditions are complex and the span of the cavern is large with high side walls. In the design, the outlet section of tailwater tunnel, the shallow section through the highway and the section of tailrace fork are analyzed and calculated according to different methods, and the corresponding support forms and supporting parameters are proposed. The steel mesh sprayed concrete, bolt and Thin concrete lining, to ensure the stability of the cavern.