Study on influence of working face layout on deformation and failure characteristics of mining-induced slope in gully area

In order to study the deformation and failure characteristics of mining slope in gully area under the influence of different working face positions when the advancing direction of working face is parallel to the gully, three numerical models are established respectively when the working face is located behind the slope, below the slope and in the middle of the gully, and the slope displacement distribution law, stress-strain distribution law and slope deformation and failure mechanism are analyzed and studied. The results show that the deformation and failure characteristics of the mining slope in the gully area are related to the layout of the working face; when the working face is behind one side of the slope in the gully area, the overall surface deformation above the goaf is similar to that of the flat area, and the slope on both sides is more stable; when the working face is located under the slope of one side of the gully area, the slope above the working face starts to be damaged from the top of the slope, and then the whole slope is damaged. The failure type is sliding landslide, while the slope on the other side of the gully remains stable. When the working face is located in the middle of the valley, the failure of both sides of the slope starts from the foot of the slope, resulting in the loss of support of the upper slope and sliding failure, and the failure type is traction landslide. Under the influence of rainfall conditions, the destruction degree of push-slide landslide is generally more serious than that of traction landslide.