Abstract
Stability analysis of slope, based on the assumption of uniform field, cannot estimate two-dimensional scale of failure. On the other side, the depth of sub-surface flow which is highly related to slope failure is never considered uniform at natural slope. Paticularly, at a V-shaped micro configuration of the ground, the rise of sub-surface flow depth must be rapid and the failure will occur first at there. This paper proposes a model which estimates two-dimensional scale of failure occurred at such a not uniform field. The model consists of two parts, one is configuration model as shown in Fig. 1-Fig. 3 and one is stability analysis model. The stability analysis model is based on circular arc method, which introduces cohesion on the side of circular arc in addition to the bottom of the arc.
