Abstract: Expressways an important component of modern transportation systems. However, in their construction and later operation, slope or landslide issues become a safety critical factor that engineering and technical personnel tend to overlook, especially the coupling effect of slope greening and maintenance on landslide generation is rarely studied. The landslide on the Xingye section of the Foshan Qingyuan Conghua Expressway is presented in this paper. Throughout the on-site investigation and software analyses, the mechanism of landslide occurrence was analyzed, and a more reasonable mitigation design and greening maintenance plan were proposed. The safety factors, sliding force, anti-sliding force, anchor rod length, and grid beam reinforcement design analysis results of the landslide were compared with different literature methods. At the same time, the coupling between greening maintenance and landslide was analyzed in depth. The results indicate that (1) belongs to a typical small-scale soil landslide, and the occurrence of landslides is mainly influenced by a combination of factors such as slope morphology, mechanical properties of rock and soil mass, and meteorological and hydrological conditions; (2) The landslide safety factor, sliding force, and anti-sliding force analysis in the article, as well as the designed ground anchor length and grid beam reinforcement, are relatively close to the analysis results proposed in different literature, and have been well applied; (3) Slope greening and maintenance can effectively slow down rainwater runoff and reduce erosion of the slope surface, while root system stabilization can improve soil shear strength. The analysis results and design schemes can provide important references for highway slopes and ensure the safety of highway construction, which is of great significance.

Key words: Foshan Qingyuan Conghua Expressway, Landslide, Mitigation, Greening Maintenance, Coupling Analysis