下桥水电站碾压混凝土拱坝设计

Design of RCC Arch Dam for Xiaqiao Hydropower Station

下桥水电站碾压混凝土拱坝采用同圆心、等外半径变内半径的单曲拱坝,最大坝高67.5 m,坝体分缝仅在左右拱端各设一道诱导缝,缝面结构简单,满足碾压混凝土大仓面快速施工的要求,坝体温度未冷却至稳定温度场即可蓄水发电,具有重复灌浆功能。拱坝采用坝顶溢流挑流消能型式,设置新型的三坎式水垫塘,消能效果良好。

Single-curved RCC arch dam with a maximum dam height of 67.5m, single center, same radius of outside and variation radius of inside is built for Xiaqiao hydropower station. At each arch dam abutment one induced joint with a simple structure is set in order to meet the requirement of quick construction on big placement surface of RCC. The project can store the water and generate power before the temperature of dam body decreases to stable temperature field, and the dam have repetitive grouting functions. Means of overflowing from dam top and ski-jump energy dissipation are adopted by this arch dam. The plunge pool of three rigs is of a new type and has good dissipation function.