Research on Rainfall Erosion Model Tests for Loess Slope

摘要

It has been a difficult issue that the surface of side slope can be easily washed out by rainfall, causing water and soil loss and thus landslide. In this paper, taking loess slope as an example, a comprehensive prevention and protection method by ecological slope fixation. The impact on protection effect by the following factors are taken into consideration: mixing amount of different modifying agent, lattice protection methods, rainfall intensity, duration, slope ratio, etc. The rules and evolutionary mechanism of soil mass erosion under these factors and their different combinations are studied. The experiment results indicate that as the mixing amount of modifying agent increases, the anti-erosion ability of ameliorated side slope will be enhanced, and the optimal mixing ratio of modifying agent turns out to be 3‰. Compared with plain soil side slope, the side slope ameliorated by 3‰ of modifying agent is less affected by rainfall intensity. As the duration increases, the effect of modifying agent becomes more distinct. By applying the modifying agent and lattice beam independently and jointly, the rain wash resistance and anti-erosion ability of the side slope will both be improved. The modifying agent connects and bonds the soil particles tighter mainly through flocculation, as a result, the water binding and anti-erosion capacity of loess are improved.