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通过渗流与应力的耦合作用分析了两级边坡的三维应力场特点,随后运用有限元强度折减法探讨了渗流作用下的边坡稳定性及影响因素。结果表明耦合法的数值要高于不耦合法,与边坡实际变形更为接近,证明了耦合模式的效果是明显的。随着平台宽度,倾角的增加,两级边坡的滑动面由单一面向双滑面发展,滑动区域也将随倾角的增加而逐渐减小。渗流的耦合作用造成底部坡体变形要小于上部坡体,水体约束了土体的横向变形,抑制坡体的下滑,研究的成果可为多级边坡的渗透破坏模式提供理论指导。
Through the coupling of seepage and stress, the characteristics of three-dimensional stress field of two-stage slope are analyzed. Then, the slope stability and its influencing factors under seepage flow are discussed by finite element strength reduction method. The results show that the numerical value of the coupling method is higher than that of the uncoupled method, which is closer to the actual deformation of the slope, which proves that the coupling mode effect is obvious. With the increase of platform width and inclination angle, the sliding surface of two slopes develops from a single facing double sliding surface, and the sliding area will also decrease with the increase of inclination. The coupling effect of seepage causes the deformation of the bottom slope to be smaller than that of the upper slope. The water body restrains the lateral deformation of the soil and restrain the decline of the slope. The research results can provide theoretical guidance for the multi-grade slope.