鉄道盛土の越水による上部構造の流失機構・条件の解明

抄録

The embankment on a floodplain significantly affects the propagation of inundation flow. In case the inundation flow overflows the railway embankment, the embankment retains a potential to be breached. The breaching of the rail and road embankment in flood plain has not been paid attention but more sophisticated treatment of the embankments in the floodplain must be developed to predict the damage due to inundation flow with intense condition. In this study, the breaching process and the critical flow condition to be breached are explored experimentally using the ballast embankment constructed by actual railway ballast material. An actual-sized ballast embankment with real rails and sleepers is installed in a open channel with 1 meter width. Using this actual-sized embankment, a criteria condition to reach severe embankment breach is specified. In the case of the water level surpasses the top of rails, the ballast layer is breached by flow through the railway embankment.