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根据工程中膨胀土路堤边坡的破坏特点,考虑浸水后的膨胀力作用,建立了膨胀土路堤边坡膨胀力的分层化三角形分布模式,从而建立了路堤边坡的荷载作用模型。采用弹塑性有限元分析法,结合具体工程实例,对膨胀土路堤边坡在浸水条件下的稳定性进行模拟分析。分析表明:考虑膨胀力作用时,路堤边坡的最危险滑动面通过坡脚点,且近似为圆弧状,边坡的计算稳定系数明显降低。浸水后膨胀力的作用会明显降低边坡的稳定性,故工程中应做好膨胀土路堤的坡面防护和防水排水措施。
According to the failure characteristics of embankment slope of expansive soil in the project and considering the effect of expansive force after soaking in water, a stratified triangle distribution model of expansive force of expansive soil embankment slope is established, and the loading model of embankment slope is established. The elasto - plastic finite element method is used to analyze the stability of expansive soil embankment slope under flooding condition with the concrete engineering examples. The analysis shows that when the expansion force is considered, the most dangerous slip surface of embankment slope passes through the foot of the slope and is approximately arc-shaped, and the calculated stability coefficient of the slope is obviously reduced. After flooding, the effect of expansive force will obviously reduce the stability of the slope. Therefore, the slope protection of expansive soil embankment and the waterproof and drainage measures should be done in the project.