西安地铁隧道不同角度穿越地裂缝时的有限元变形分析

Deformation Analysis of Xi'an Metro Tunnel Crossing Through Ground Fissures with Different Angles using Finite Element Model

以西安地裂缝地质灾害为背景,选择已经开工建设的地铁1号、2号线为研究对象,采用有限元软件Marc,建立地裂缝环境下分段式地铁隧道与土体相互作用的模型,分析在不同交角情况下隧道的变形及应力变化规律,得出地铁隧道与地裂缝不同交角下,地裂缝活动对其造成的危害规律。结果表明在不同交角情况下隧道分段处均有错台现象,而且基本在地裂缝带处的竖向位错量较大,并且还伴随有水平位错发生,在小交角情况下,水平位错量较大。

Based on the background of ground fissure geological disaster in Xi’an,this paper chose the subway line 1 and line 2 under construction in Xi’an as the study objects.With the finite element software Marc,an interaction model of sectional subway tunnel and soil under the environment of the ground fissures was established,and the tunnel deformation and stress changes in the case of different dislocations were analyzed and the risk law caused by ground fissure was obtained.The results showed that there were vertical dislocations between segments of tunnels,the distance of dislocation was at the most at the ground fissure,the horizontal dislocation between segments of tunnels also raised at the same time and it was larger when the tunnel across ground fissure was at a smaller angle.