膨胀土高填方路堤稳定性的有限元分析

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。

Analysis of Stability of Expansive Soil High-Fill Embankment with FEM

According to the failure characteristics of expansive soil embankment in engineering,the expansive force after soaking is considered, the bedded triangular model of the expansive force in expansive soil embankment is established,and then the load model of the embankment is set up.By use of the elastic-plastic finite element method,the stability of expansive soil embankment in soaking condition is simulated and analyzed by taking an actual project as example.The analysis indicate that when expansive force considered,the most dangerous slide face would pass through the slope feet and be approximate arc,the stability coefficient would be debased obviously.The expansive force after soaking would reduce the stability of the slope,so the protecting,waterproofing and draining measures for the slope surfaces of expansive soil embankment should be made good in engineering.