地下立交的三维有限元数值分析

Three-dimensional Numerical Analysis by FEM for Underground Interchange

地下立交工程是地下交通工程中的重要组成部分。为了准确、客观的分析立交隧道的受力特性,对地下立交隧道的受力特性进行三维有限元数值分析,利用有限元强度折减法,分析了竖向位移、塑性区的分布、塑性应变、主应力的变化情况,并给出了相应的安全系数;指出了地下立交隧道的薄弱区域,以便于进行施工加固,从而提高其整体安全性。

Underground Interchange is an important part in underground transport. In order to analyze the interchange tunnel more accurately and objectivly, a nonliner model has been applied to simulate the three -dimensional interchange tunnel by FEM, and the vertical displacement, plastic zone distribution, plastic strain, principal stress and safety factors are analyzed, and the interchange tunnels weak regions have been pointed out, in order to reinforce them by construction work and enhance their overall security thereby.