The 3rd Badong International Geohazards Symposium (BIGS2021)

12 / 2021-10-18 16:52:59

Deformation characteristics analysis of geological hazards based on monitoring data in Three Gorges Project reservoir area

Geological Hazard,monitoring,deformation characteristics,Three Gorges Reservoir area

To further summarize the deformation characteristics and mechanism of geological hazards in the Three Gorges Reservoir Area, based on the professional monitoring data of 189 geological hazards, this paper deeply studies the displacement-time curve of geological hazards. The results show that: (1)From 2017 to 2019, the deformation situation of the geological hazards generally tends to be gentle. The deformation mainly occurs from May to September, and rainfall becomes the main inducing factor. According to the annual deformation and the macroscopic deformation of geological hazards, it is divided into four categories: non-deformation or micro-deformation, slow deformation, relatively obvious deformation, obvious deformation. (2)According to the cumulative displacement-time curve characteristics of GNSS, the deformation characteristics of geological hazards are divided into three basic types: Oscillatory type, linear type and step-like type. The displacement of step-like landslides are the main deformation form of geological hazards with obvious deformation and relatively obvious deformation, which is the focus of geological hazards. (3) Through the analysis of deformation characteristics and trigger factors, eight kinds of step-like type deformation characteristics of geological hazards during the operation period of the Three Gorges Reservoir are summarized, the deformation modes under the action of different trigger factors are put forward, and the differences of the cumulative displacement-time curve in four aspects, such as the morphological characteristics of the deformation of step-like, the height, the occurrence time and the repetition regularity are concluded. It provides a basis for deformation analysis and early warning of geological disasters in the Three Gorges Reservoir area.