Analysis of reactivated characteristics and influencing factors of the Lamajue landslide in Meigu County of Sichuan Province

Engineering construction disturbs old landslides and becomes an important factor for the revival of old landslides.The revival of the old landslide affects the construction and safe operation of the project.The Meigu Ramajue landslide in Sichuan is a typical giant old landslide, the leading edge of the old landslide is reactivated, through field monitoring and numerical simulation, the characteristics and influencing factors of landslide revival deformation were studied, the results show that: (1) Rainfall and human engineering activities are the main factors that induce the resurrection of the old landslide.The resurrected landslide is located at the front of the old landslide, and the creep deformation volume of the landslide is about 2.556 million cubic meters. (2)The landslide body slides rigidly, showing the characteristics of single sliding surface and rocky landslide, and the sliding surface is generally located at the base-covering interface. (3) After two stages of treatment, the anti-sliding piles have obvious effect of blocking the sliding body, and the stability of the sliding body has been significantly improved. At present, the deformation of the sliding body tends to be stable, which can meet the deformation and stability requirements of the normal operation of power facilities.The research of this paper is carried out based on engineering examples, and its research results provide a certain theoretical basis for landslide stability evaluation, prevention and control engineering design, and engineering effect evaluation after treatment.