Rainfall infiltration affects stability of a slope. Though there are many method to reflect various rainfall conditions into slope stability, they are only focused on constant value of rainfall conditions. The variation of slope stability under various rainfall condition, patterns, is executed in this study. And effective rainfall for rail-transport operation control is also examined for applicability to Korean railway lines.

To obtain design parameter of soil protection structure having anchor type foundation, model test is executed for flexible and rigid structures. Empirical equation for soil impact force with variation of slope angle and spacing is suggested in this study.