根据缅甸DAPEIN(I)水电站压力管道段工程布置及地质条件，选择埋藏式钢岔管和钢筋砼岔管两种岔管类型，分别建立三维有限元数值模型，从岔管位置的确定、岔管的体型设计、应力应变等方面进行分析。结果表明：钢岔管围岩属Ⅳ类，相对较差、管壳及管壁应力较大，焊接工艺复杂、施工制作困难、造价较高?；钢筋混凝土岔管围岩属Ⅱ~Ⅲ类，采用对称"Y"型结构，岔口附近应力集中，双层配筋，并对围岩进行固结灌浆及回填灌浆等措施。

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 wall rock of the steel bifurcation pipe is grade IV, which has relatively poor conditions. The stresses on the shell and wall of steel bifurcation pipe are high, and the pipe has complexity of welding technology, difficulty in construction, and high cost. The wall rock of the concrete branch pipe is grade II~III. The concrete branch pipe uses the "Y" type structure with concentrated stress near the bifurcation, and double reinforced concrete is used. The wall rock needs the consolidation grouting and backfill grouting treatments.