## 3 Results and Analysis
### Influence Law of Substrate Characteristics on Water Infiltration Performance  
3.3.1 Influence Law of the Cement Content on the Water Infiltration Performance of Ecological Slopes  
After the soil infiltration process reaches stable infiltration, the stable infiltration rate can be used to characterize the soil infiltration capacity; however, before reaching stable infiltration, the cumulative infiltration volume is usually used to characterize the soil infiltration capacity, and the cumulative infiltration volume refers to the total amount of water infiltrated into the soil per unit surface area within a certain time period. From Figure 13, it can be seen that the variability of the accumulated infiltration volume of slopes with different cement contents in the range of 0-30 min is not significant, and the accumulated infiltration volume of soil increases rapidly with the rainfall time from 30 min to 150 min in the process of soil infiltration. The difference in cement content on the accumulated infiltration volume gradually appears, and the growth rate of accumulated infiltration volume shows a trend of 0% > 1% > 3% > 5%. After the soil infiltration is greater than 150 min, the cumulative infiltration curve of each slope reaches the stable infiltration stage, and the cumulative infiltration volume increases evenly with the rainfall calendar. The cumulative infiltration volume at the end of the rainfall is 0% > 1% > 3% > 5%, which is mainly because with the increase in cement content, the infiltration coefficient of the substrate decreases, the water infiltrated into the soil from the surface area per unit time decreases, and the infiltration capacity of the soil. This indicates that the increase in cement content in the substrate can significantly reduce the cumulative infiltration volume of the soil and the infiltration capacity of the soil, and the infiltration capacity of the soil decreases with the increase in cement content. The soil infiltration rate is also one of the important indicators used to characterize the infiltration capacity of soil. From Figure 14, it can be seen that the infiltration rate of soil decreases rapidly within 0-150 min. After 150 min, the infiltration rate of soil does not change significantly with increasing infiltration time and is close to the stable state--that is, the infiltration time is identified as reaching the stable infiltration rate at approximately 150 min. The infiltration rate showed 0% > 1% > 3% > 5% at any time within 240 min, which means that the infiltration resistance of the slope increased with increasing cement content, and the initial infiltration rates of the 1%, 3% and 5% cement content slopes were 94.86%, 92.29% and 89.20% of the 0% slope, respectively, and the final infiltration rates were 87.36%, 81.04% and 73.45% of the 0% slope, respectively. Figure 13: Cumulative infiltration with rainfall time curve. As demonstrated earlier, cement content is negatively correlated with the infiltration coefficient of the substrate. The infiltration pattern of soil water is highly dependent on the infiltration coefficient--that is, the higher the cement content, the lower the infiltration coefficient, the lower the rate of water infiltration and the lower the amount of infiltration. Therefore, in the design of ecological slope substrates, within the range that plants can adapt to growth, an appropriate increase in cement content will help the slope's resistance to water infiltration and improve the stability of the slope. .3.2 Influence Law of Substrate Thickness on the Water Infiltration Performance of Ecological Slopes  
From Figure 15, it can be seen that the variation in the accumulated infiltration volume of slopes with different substrate thicknesses in the range of 0-30 min is not significant, and the accumulated infiltration volume of soil in the process of soil infiltration increases rapidly after 30 min of rainfall time.