Effect of Development Conditions of Faults on Slope Stability in a Certain Open Pit Mine
Taking a certain open-pit mine in Xiaoxing'anling area as an example,in order to study the development conditions of faults,methods such as geophysical exploration,drilling,hydrogeological tests were used to compre-hensively analyze fault information and form a understanding of pressure torsion fault layers.Drilling results and rock and rock structure were analyzed,fault development sections were divided,and understanding of fault orienta-tion,scale,and rock characteristics were formed.Hydrogeological data and geophysical conclusions was analyzed to form understanding of water blocking faults.A three-dimensional geological model of the fault area was estab-lished and FLAC numerical analysis was applied to study the impact of faults on slope stability:until the final boundary,the F3 fault has been basically mined and the main body of the slope is in a stable state.Based on the displacement,shear strain increment,plastic zone expansion,and safety factor results,the fragmented rock mass left behind the upper fault of the northwest slope is the main risk factor for the stability of the final boundary slope.After calculation,the safety factor of the relevant area is less than 1.0,which is the key direction of slope treatment;Adopting a slope cutting and load reduction+foot pressure treatment plan were adopted,after prelimi-nary research and calculation,the amount of slope cutting work is about 5 000 000 m3,and the amount of foot pressure is about 500 000 m3.Compared to that before the clear development conditions of the F3 fault,the cost of treatment is basically controllable.
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