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为了获得天平铁路土建一标段的牛头山黄土隧道结构的动力稳定安全系数,从而为该隧道的安全运营提供可靠保证。本文考虑混凝土隧道衬砌结构为弹塑性本构关系,围岩土体为理想弹塑性材料,采用有限元软件ANSYS和抗剪强度折减法,利用时程分析法进行牛头山黄土隧道的地震稳定性分析,获得了它的地震稳定安全系数,定量估计该隧道结构的地震动安全储备情况。数值算例结果表明:(1)地震作用会使得黄土隧道结构的安全系数降低;(2)塑性区最先出现在底脚以及拱顶,然后出现在曲墙两侧。因此,结构设计时应加大衬砌厚度,并对曲墙两侧和底脚塑性发展严重区采取构造措施加强。
In order to obtain the dynamic stability and safety factor of the Niutoushan loess tunnel structure of the first section of the Tieping Railway, it provides a reliable guarantee for the safe operation of the tunnel. In this paper, the concrete tunnel lining structure is elastoplastic constitutive relationship, the surrounding rock mass is the ideal elastic-plastic material, and the finite element software ANSYS and the shear strength reduction method are used to analyze the seismic stability of the tunnel in the seamount area. , Obtained its seismic safety factor and quantitatively estimated the ground motion safety reserve of the tunnel structure. The numerical results show that: (1) the seismic effect will reduce the safety factor of the loess tunnel structure; (2) the plastic zone first appears at the foot and the vault and then appears on both sides of the curved wall. Therefore, the design of the structure should increase the thickness of the lining, and on both sides of the curved wall and the foot of the plastic zone of serious development measures taken to strengthen.