浸透による堤防のり尻からの崩壊の円弧すべり計算を用いた評価法の提案

抄録

The minimum safety factor of circular slip is applied as usual to evaluate stability of embankment including levee. The minimum safety factory can only assess likely to occur slope failure, but it has low applicability to the failure of increasing failure region and decreasing performance gradually, for example, progressive failure from foot of embankment due to seepage. A simple method to evaluate progressive failure of levee considering usage in design practice is necessary.

In our research, the progressive failure mechanism is analyzed from the relationship of failure progress and water level in the model embankment, and from the observation of the fracture morphology of the model at first. A new simple method is proposed. The method impresses region where arcs with safety factor less than 1.0 pass through and it is based on analysis of failure mechanism. Finally, the method is verified by comparing to the model test.