Faulting as a typical adverse geological structure has a significant impact on the stability of engineering rock masses.Based on the typical inclined medium-thick broken ore body of a mine in Shandong Province,uses numerical simulation to analyze the stability of surrounding rock in medium-deep hole stope under the influence of faults.In view of the diversity of fault and tectonic distribution in this mine,the dip angle of the fault,the thickness of the fault and the relative position of the fault and the medium-deep hole quarry are selected as the influencing factors for calculation and analysis.Numerical calculation results show that:due to the existence of the fault,the amount of surrounding rock deformation between the fault and the deep hole quarry,the range of surrounding rock deformation influence and the range of damage area are increased to different degrees,while the fault shows obvious barrier effect,and the displacement,stress and damage degree of surrounding rock on the fault are significantly reduced.With the increase of fault dip angle in the upper plate of the ore body,the displacement amount,deformation range and depth of damage zone of the quarry surrounding rock first decreases and then increases,when the fault dip angle is 54°,the range of damage zone of the quarry surrounding rock is the smallest and the depth of damage zone is only 0.05 m.With the increase of the thickness in the upper plate of the ore body,the displacement of the surrounding rock,the deformation range and the depth of the damage zone increase linearly.When the thickness of the fault is 2.5 m,the depth of the damage zone reaches 1.16 m.Comparing the influence of the relative position relationship between the fault and the medium-deep hole stope on the stability of the surrounding rock,it can be seen that when the fault is more than 10 m away from the medium-deep hole stope,the fault no longer affects the stability of the surrounding rock.