A 3D-FEM method for analysis on stability of underground bifurcated pipe, with geometrical imperfection and initial gap between concrete liner, is introduced.

• 摘要考虑了钢岔管与混凝土垫层的初始缝隙和初始几何缺陷，给出了一套地下埋藏式钢岔管抗外压稳定性的三维有限元分析和求解方法。