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Study on Stability and Ecological Restoration of Soil-Covered Rocky Slope of an Abandoned Mine on an Island in Rainy Regions

The eastern slope of the abandoned mine in the Zhoujiayuan Mountain Island area has been seriously damaged by local quarrying, which often triggers visual pollution, soil erosion, and landslides during rainfall. This paper carries out an ecological restoration of the abandoned mine based on indoor experiments and field investigation data. The paper also quantitatively analyzes the stability evolution laws of the soil-covered slope before and after the ecological restoration in the rainfall process, putting forward further slope reinforcement and ecological restoration measures. The results showed that the stability safety factor of the covered slope decreased to 0.92 after raining for 18 h, and the instability risk was very high. When the vegetation had recovered, the stability of the soil-covered slope with root system was significantly improved, and its safety factor was close to 1.15 after 64 h of continuous rainfall. Throughout the field observation conducted from 2019 to 2022, the slope of abandoned rock mines was found to be lush with restored plant diversity. After several continuous rainfall processes, neither soil erosion nor instability phenomena were found there. The study has certain reference significance for the ecological restoration of abandoned rock mines in rainy regions.