地下埋藏式钢岔管三维有限元分析

结合某抽水蓄能电站的地下埋藏式钢衬钢筋混凝土岔管工程实例，采用Marc有限元软件，对钢岔管与围岩联合承载进行数值模拟。通过三维有限元线性和非线性计算，考虑了初始地应力、开挖支护引起的二次应力，以及钢衬与混凝土垫层间的初始缝隙对钢岔管受力和变形的影响，分析了岔洞开挖、支护及充水运行等工况下，钢衬、混凝土衬砌、围岩的应力和变形，得出了一些对工程有意义的结论。

3D Finite Element Analysis of Underground Steel Bifurcation

As an example, the underground steel liner reinforced concrete bifurcations of a certain pumped storage station are analyzed by the finite element method (FEM) software Marc, to simulate the united bearing of steel lining and surrounding rock mass. By using 3D linear and nonlinear FEM, the stress and strain of steel lining, concrete and surrounding rock mass are analyzed in different working conditions. The influence of initial ground stress, secondary stress and gap between steel lining and concrete are considered. Some useful conclusions are got.