拟合地震波作用下综合管廊抗震有限元分析

以包头市城区综合管廊为研究对象,利用工程场地土的剪切波速等参数,合成基岩地震加速度作为输入地震动时程,并利用Midas GTS NX软件对其进行模拟,得到了土体位移响应、土体加速度响应、管廊加速度响应、管廊相对位移变化以及管廊最大剪应力,并进行了分析。结果表明:土体深度越小,土体加速度放大系数越大;综合管廊各点处加速度时程曲线与输入地震波时程曲线基本吻合;管廊最大剪应力出现在右侧顶板,证明了在地震作用下管廊受土体变形的影响发生了一定的扭曲破坏。因此,在设计、施工过程中应该对管廊的顶板进行重点设计与防护。

Seismic finite element analysis of utility tunnel under fitted seismic wave

There are few theories of structure design on seismic analysis of utility tunnel in China.Taking the utility tunnel in Baotou city as the research object,the seismic acceleration of bedrock is synthesized by using the local measured shear wave velocity and other parameters,and put it as the input seismic time history,then the utility tunnel is simulated by Midas GTS NX software.It is found that the smaller the soil depth is,the greater the amplification coefficient of soil acceleration is.The maximum shear stress appears on the left roof of the utility tunnel,which proves that the utility tunnel is distorted by soil deformation under earthquake.Therefore,the design and protection of the roof of the utility tunnel should be focused during the design and construction process.