山岭隧道洞门段衬砌结构动力响应及震害机理研究

发布时间：2018-03-24 14:15

本文选题：山岭隧道　切入点：强震　出处：《中外公路》2017年02期

【摘要】：以汶川地震中遭遇严重破坏的烧火坪隧道为背景,建立三维有限元数值模型研究洞门浅埋隧道结构在地震作用下的动力响应特性。同时,为真实反映岩土体及混凝土衬砌结构在强震作用下的屈服变形及损伤破坏过程,在数值计算中引入Drucker-Prager屈服准则及混凝土损伤本构模型。根据数值计算结果对衬砌应力响应及结构损伤破坏分布特征等进行分析,并与现场震害模式进行对比讨论。研究结果表明:隧道洞门浅埋区域主要以拱腰及拱肩区域的受拉破坏为主,结构稳定性及破坏主要受第一个地震动峰值段控制;破坏程度随着隧道纵深的增大而逐渐降低,并在距离洞口约40 m处趋于稳定;隧道拱腰两侧围岩屈服破坏导致刚度降低是造成衬砌拱腰应力增大及破坏的主要原因。
[Abstract]:The fire Ping tunnel badly damaged in the Wenchuan earthquake as the background, the establishment of dynamic response characteristics of three-dimensional finite element numerical model of shallow buried tunnel portal structure under earthquake. At the same time, yield deformation and damage process reflect the rock mass and concrete lining structure under strong earthquake, the introduction of Drucker-Prager in numerical calculation yield criterion and damage constitutive model of concrete. Based on the results of numerical calculation of lining damage stress response and structural damage distribution characteristics were analyzed, and compared the discussion with the earthquake damage model. The research results show that the tunnel shallow region mainly in the arch waist and arch shoulder area tensile failure, structural stability and failure is mainly affected by the first peak ground control segment; the extent of damage decreased with the increase of the depth of the tunnel, and in the distance about 40 m tends to be stable The main reason for the stress increase and damage of the lining arch waist is the yield failure of the surrounding rock of the tunnel arch.

【作者单位】：江苏建筑职业技术学院能源与交通学院;
【分类号】：U451.4

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