Abstract:In order to study the damage characteristics of fault spatial position on the open pit slope, taking the open pit mine as an example, FLAC 3D numerical simulation software is used for simulation calculation, and selects the distance between the fault and the slope top surface, fault thickness, distance between the fault surface and the slope face surface. By changing the value of each factor, the damage characteristics of fault spatial position on slope under different factor values are obtained, and the sensitivity of three spatial position factors on slope stability is ranked by orthogonal experiment and gray correlation. The results show that when the fault is above the horizontal line of the slope, the less the sliding damage is, the damage to the complete rock mass of the slope. When the distance between the fault surface is less than 50m, the slope has "bottom drum phenomenon" at the bottom of the slope, and the distance between the fault surface and the slope is more than 50m.