Monitoring and countermeasures of Hejiawan Landslide in the Three Gorges Reservoir area

Based on the slide mass structure,physical geography and stratum lithology of Hejiawan Landslide,studying on the two factors which influence the stability of Hejiawan Landslide,this paper analyses the causes of landslide formation.The monitoring plan was laid out based on the geological hazard prevention design.The monitoring to earth transmutation,ground water level,deep slide mass displacement and macroscopic state have been actualized for Hejiawan Landslide,and the data show that the value of distortion has exceeded 2cm,while groundwater level and deep slide mass displacement do not have obvious change.According to the monitoring data and taking the impoundment of Three Gorges Reservoir into account,the Hejiawan Landslide is under unstabile state.The landslide will be in critical creeping motion or at the unsteady state after impoundment.Considering the practical situation and studying on control measurement for slope,the backfill toe weight and drainage system are adopted to keep the slide mass stable.For improving efficiency of monitoring,it is suggested to put more energy on the study and practice of data transfer.