Study on dip bedded slope stability of open-pit coal mine under influence of oblique fault

The influence of the fault on open-pit mine slope sliding mode and stability is very complex, which is serious threat to safe production. Especially in the cases of faults and dip weak layers, it leads a large number of mine landslide accidents. The present research results focus on the influence of geological features such as fault dip, thickness, occurrence and distance on slope stability, but there is relatively little research on slope sliding mode and stability under combine of faults and dip weak layers. In order to research the influence of fault morphology on dip bedded slope sliding mode and stability, this paper takes the eastern slope of Yuanbaoshan open-pit mine as engineering background, applies field investigation, theoretical analysis, numerical simulation and other methods to explore the geological characteristics of eastern slope engineering and establish the three-dimensional geological model, at the same time, describes the spatial location of the fault by changing the dip angle of the fault and the tend angle of the fault and the slope, and clarifies the slope stability changing low with the fault from the perspective of slope sliding mode based on numerical simulation analysis results. The results show that when the fault dip angle is between 50°and 65°, the slope sliding mode is combined destruction of arc, fault and dip weak layer, and the slope stability coefficient increases gradually with the increasing of the fault dip angle, while when the fault angle is greater than 65°, the slope sliding mode is combined destruction of arc and dip weak layer, and the slope stability coefficient is no longer changed. On the other side, when the tend angle is between 30°and 70°, the slope sliding mode is combined destruction of arc, fault and dip weak layer, and the slope stability coefficient increases gradually with the increasing of the fault dip angle, while when the tend angle is greater than 70°, the slope sliding mode is combined destruction of arc and dip weak layer, and the slope stability coefficient is no longer changed.