Abstract: Loess subgrade slope is subjected to erosion under heavy rain,which is detrimental to highway mainte-nance and driving safety.The anti-erodibility of loess slope reinforced by SH-polymer,cement,and lime,respectively, are examined comparatively through artificial rainfall test. Indicators inclusive of runoff start time, total sediment yield, and total runoff volume are quantitatively evaluated, and the effect of different soil stabilizers on anti-erodibility is analyzed. Results reveal that a 8% concentration of SH-polymer could reduce sediment yield and sediment yield rate to the optimum; yet increasing the concentration over 8% makes no further obvious contribution. Cement and lime are superior than SH-polymer in reducing sediment yield rate and sediment yield volume, but would also reduce the permeability of slope remarkably, bring about runoff in advance and larger runoff volume. By combining the three stabilizers, the shortcomings of each single stabilizer can be compensated, and the anti-erodibility of loess subgrade slope can be improved comprehensively.

Key words: subgrade slope, loess, soil erosion, SH-Polymer, composite material, artificial rainfall test, anti-erodibility test