两种堤坝稳定分析方法的比较

A Comparison of two methods for embankment stability analysis

利用改良圆弧法和圆弧法分别计算堤坝的安全稳定系数 ,并将两种方法在材料指标、坝坡、软弱夹层埋置深度和地震力作用等条件下的计算结果进行比较 ,分析夹层对堤坝稳定的影响 .当夹层埋置深度小于坝高 ,夹层的抗剪强度小于坝堤土抗剪强度的 47%或在地震区 ,应采用改良圆弧法计算含软弱夹层堤坝的稳定性 .

The circular arc method and the improved circular arc method are applied to calculation of the safety factor of embankments respectively, and the calculated results by the two methods are compared for different material parameters, different dam slopes, different interlayer embedded depths, and different earthquake forces. Besides, influences of interlayers on stability of embankments are analyzed, and the results show that under such conditions that the interlayer embedded depth is smaller than the height of embankments, the shear strength of interlayers is smaller than 47% of the shear strength of embankment soil, or interlayers lie in seismic regions, the improved circular arc method should be used to calculate the stability of embankments with soft interlayers.