《不同隧道断面结构处的地表振动分析》

地铁列车的振动对隧道周围土体强度和变形有较大的影响。本文以北京地铁5号线的隧道尺寸和土质特性为研究背景，用有限元软件对圆形隧道和矩形隧道在相同列车振动荷载作用下的动力响应进行计算，给出了隧道周围土体的变形情况和地表位移。并将这两种断面的有限元计算结果进行比较和分析，为以后的工程设计提供依据。

Analyses of Dynamic Responses of Subway Tunnels with Different Sections under Vibration Loading

Strength and deformation of soil around the subway tunnel is greatly affected by the vibration induced by the subway trains. In this paper, taking Beijing subway line 5 as an example, the dynamic responses of subway tunnels with rectangular and circular sections under train’s vibration loading are computed by means of the finite element code. The deformation of soil around the subway tunnels and the displacements of the ground surface are also given. The computation results for the two sections are analyzed and compared mutually. These results may provide some reference data for subway tunnel design。