中文摘要：

对土坡而言，利用有限元-强度折减方法将边坡代入临界破坏状态时，临界滑面上的点往往是沿深部方向的等效塑了边坡的临界滑面。与其他方法的相对比，验证了该方法的可靠性。性应变最大的地方。通过设置一系列沿水平方向布置的垂直直线，并找出沿每条直线上的等效塑性应变最大值的位置后，就可得到一系列呈波动状的点的分布，它们构成了所谓的函数型数据，再利用最小二乘法对这些函数型数据做平滑处理就得到了边坡的临界滑面。与其他方法的相对比，验证了该方法的可靠性。

英文摘要：

Once a soil slope is led to the limit equilibrium state by means of the finite element - strength reduction technique, usually, the critical slip surface goes through the points at which the equivalent plastic strain takes the maximum. First, some vertical lines are arranged along the horizontal direction. Then, along each of the vertical lines the point with the maximum equivalent plastic strain is found out. All such points compose a wave and make up the functional data. Finally, the functional data are smoothed by the least square method and the position of the critical slip surface is determined. The proposed procedure is confirmed through the comparison with other mature methods.