(1. Institute of Geotechnical Engineering，Beihang University，Beijing 100083，China；2. Antaibao Open-pit Mine，Pingshuo Coal Industry Company，Pingshuo，Shanxi 036006，China)
Abstract：3D numerical program is used to analyze the stability of the slope affected by underground excavation. Research show that the open-off cut position plays a key role in the slope stability. The numerical simulation is conducted to optimize this boundary parameter，and the results shows that the slope stability is improved to ensure the safe production when the horizontal distance between open-off cut and slope increases to 20 m based on the original data. At the same time，the material simulation method is used to make sure of the scheme. The slope is stable when the scheme is adopted in field.
