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Owing to the heavy rainfall, a landslide occurred at the Anqian Iron mine, at 18:00(UTC + 8) on November 24, 2019, in China. The landslide was about 3.0 × 104 m3 and caused damage to the road of transporting waste materials. Failure characteristics and the mechanism of this landslide were analyzed in this study. The landslide area was divided into three parts: the rear tension cracking area, the middle sliding deformation area, and the front colluvium area. A contact-free measuring technique using the new ShapeMetrix3D system was applied and 204 joints were analyzed based on equal-angle stereographic projection. Thus, a conceptual model of the mechanism of the landslide was constructed and the formation process of the landslide was divided into three stages: the first shearing and dislocation stage; the second sliding, front bulging, and rear tractive cracking stage; and the third local rock mass collapse and colluvium depositing stage. Numerical modeling was performed to discover the landslide mechanism by progressively reducing the shear strength of rock mass. The results showed that the original slope was stable, whereas heavy rainfall triggered the landslide, and the predicted failure surface matched closely the field investigations. The factor of safety obtained by real three-dimensional analyses was slightly higher than that obtained by plane problem analyses, and the difference was attributed to the three-dimensional effect of the landslide. This paper also presents the results obtained from the parametric analysis in order to understand the impact of shear strength parameters on the overall stability of the slope. [ABSTRACT FROM AUTHOR]

This paper presents a study of the failure mechanism and control measures for a seismically induced landslide along the Wanzhou-Liangping expressway in China. It is shown that the dominant cause of the slope stability problem is the original inappropriate geometry of the slope. Slope stability analyses were performed using Spencer's method incorporated with the pseudostatic method, which showed that the rock slope was unstable after the Wenchuan earthquake, and the stability of the studied area was governed mainly by the significant potential of deep sliding. Measures to stabilize unstable zones include resloping and unloading the slope, installing rock anchors and a retaining wall, improving drainage, and vegetating bare areas. The results indicate that the measures were effective in controlling the landslide. [ABSTRACT FROM AUTHOR]