The Law Research of Rain Erosion in the Typical Roadbed Slope Engineering During Construction Period

In black soil region of Northeast China,red soil region of South China and loess region of Northwest China,typical railway slopes are selected for runoff plots experiment of natural railfall erosion and gully erosion. The study found that the slope of the subgrade engineering is erosion evidently by rain. The rainfall erosion process is mainly sheet erosion and annual rainfall erosion is gully erosion. The different slope type and whether the protection of the roadbed is most obvious influencing factors of embankment erosion,followed by rainfall condition factor. The runoff on traffic engineering slope generally is excess seepage. And the rainfall erosion process is a strong timevarying regularity. Infiltration rate and time presents a good logarithmic or exponential variation,the erosion modulus and sandy rates are being stabilized,significantly affected by the engineering. Slope protection and governance work of subgrade engineering is very important.