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随着我国高速公路网的逐步密集,高烈度区路堤地震稳定性问题越来越突出。FLAC2D软件有强大的岩土体地震反应分析功能,但用其分析路基地震稳定性的文献非常匮乏。以某山区高速公路斜坡路堤为例,介绍采用FLAC2D进行地震分析的方法,着重讨论几何模型建立,边界条件设置,阻尼选取及参数确定,输入地震动合成、修正及转化中应注意的问题。基于此,对路堤进行地震模拟分析,从位移、加速度、动剪应力分布三方面分析其地震稳定性。该方法可为相似工程地震稳定性分析提供参考。
With the gradual concentration of highway network in China, the seismic stability of embankment in high intensity area becomes more and more prominent. FLAC2D software has a strong capability of seismic response analysis of rock and soil mass, but there is a lack of literature to analyze seismic stability of subgrade. Taking a mountainous highway embankment as an example, the method of seismic analysis using FLAC2D is introduced. The establishment of geometric model, setting of boundary conditions, damping selection and parameter determination, and the issues that should be paid attention to in synthesizing, correcting and transforming ground motions are discussed. Based on this, the seismic simulation of the embankment is carried out, and the seismic stability is analyzed from three aspects of displacement, acceleration and dynamic shear stress distribution. The method can provide reference for the seismic stability analysis of similar projects.