Abstract:

Laboratory and field scour testing studies for loess slope indicate that the increasing of slope angle degree causes the maximum rill depth of slope surface firstly decreases and then increases later on; the nearer of the difference between the slope angle degree with the critical angle, the smaller possibility of slope surface erosion. The theoretical formula for calculating critical angle of cutting loess slope is derived based on Gradient current theory. A conclusion drawn from investigation is that the longer of the slope height is, the more erosion of the slope surface is. The optimization design model for cutting loess high slope based on surface stability is built when the relationship among slope angle, slope surface length and the erosion mass quantity is studied. At last, this model is verified by a typical example of cutting loess slope; and the result shows that this model agrees well with the actual situation.

Key words: loess high slope, slope surface, stability, optimization design