Analysis of instability process of the loess landslides under rainfall and excavation actions: A case study of Laomiao landslide at Yangchang Village in Changwu County, Guanzhong area

Rainfall infiltration and artificial excavation are important factors inducing the loess landslides. To study the deformation process of loess landslides in the Guanzhong area and its influence on stability under the two inducements, the Laomiao landslide in Yangchang Village, Changwu County, Shaanxi Province is taken as the research object.Through field investigation, geological mapping and borehole exploration, the deformation characteristics of the landslide are determined, and the deformation evolution process of the landslide is qualitatively analyzed. Based on the measured daily rainfall within 15 days before the landslide deformation, the process of landslide formation under continuous rainfall after excavation actions at the slope foot was simulated by using finite element software. Based on the strength reduction method, the stability variation law of the landslide is studied. The results show that: ① the special formation structure in the Guanzhong area is the internal cause of landslide deformation