According to the engineering design and geological conditions of the pressure pipe in DAPEIN(I)hydropower station,two types of bifurcation pipes were chosen including the buried type steel bifurcation pipe and reinforced concrete bifurcation pipe.Three-dimensional numerical analysis models were developed for both types of bifurcation pipes and model results were compared from the aspects of the bifurcation pipe position,bifurcation pipe size design,and stress and deformation.The results showed that the geol...