Resurrection deformation characteristics and stability of Jiangdingya ancient landslide in Zhouqu, Gansu Province

In order to study the resurrection deformation characteristics and stability of Jiangdingya ancient landslide, the deformation characteristics and stability of the main body, rear wall and side wall of the landslide are analyzed by means of historical data investigation, field survey, monitoring, satellite remote sensing and indoor geotechnical test. The results show that the slope toe is unstable due to rainfall and river scouring; Under the influence of groundwater and continuous heavy rainfall, the shear strength of the middle and rear soil decreases, the sliding force increases and moves forward gradually; Finally, due to the sliding of the front soil, the anti sliding force decreases, resulting in overall sliding, which is a slow sliding traction landslide. The rear wall and side walls on both sides of the landslide are high and steep, with obvious signs of deformation, and are prone to instability and sliding under heavy rainfall or earthquake conditions. Jiangdingya landslide has the characteristics of long-term creep deformation and multiple resurrection sliding. It is one of the largest landslides in Gansu Province in recent years. Under the action of earthquake or rainstorm, the landslide may resurrect again. It is suggested to strengthen the deformation monitoring of the landslide area, and strengthen the treatment of unstable slopes in the area to prevent major disasters.