| Subgrade slope surface erosion is defined as a phenomenon which rain runoff destroys subgrade slope surface, and washes away soil on the surface of slope. It is the most common problem in the field of highway. However, it is studied insufficiently. And only a few research work is reported in the literature. As silty soil subgrade whose engineering characteristics is of a sort , it's slope erosion is more serious than others. In this article, aiming at silty soil subgrade slope, the author tries to study on the erosion characteristics of the silty soil subgrade slope from theory and experimentation. The main results are summarized in what follows:(1) Erosion influence factors on silty soil subgrade slope are analysed and studied systematically, the degree of erosion influence factors are confirmed by Grey Incidence Analysis theory, so as to make sure which factor is the sensitive factor.(2) The force features of soil on slope surface during scouring process are analyzed. A theoretical formulation of incipient motion drag force is developed for the uniform silty soil subgrade slope, the erosion commencing conditions of silty soil subgrade slope, and the energy exchange and balance of erosion process on raindrop spattering and runoff scouring are studied. Also, formulations of the runoff sediment-carrying capability on slope bed load and suspended load are derived. Theoretical discussions for the occurrence and development of erosion on silty soil subgrade slope are given.(3) A indoor model experimentation is carried through, Erosion influence factors on silty soil subgrade slope are analysed quantificationally.(4) The influence of rain is considered, By using reliability theory, the stability of subgrade slope is studied.
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