Landslide Deformation Characteristics in Three Gorges Reservoir Area and the Corresponding Influencing Factor Analysis

Abstract:

The main influencing factors related to the fording landslides in the Three Gorges Reservoir area are the water level and rainfall, which are also the main inducing factors behind the instability of landslide bodies in the reservoir area. The annual rise and fall of the water level in the reservoir area are not conducive to the stability of the landslide, and rainfall, especially heavy rainfall, also induces landslides. When rainfall adds to the fluctuation of water level, the landslide will intensify. Therefore, it is necessary to analyze the leading factors affecting landslide deformation. In June 2016, the automatic monitoring of landslides in the Three Gorges Reservoir area was carried out, making statistical analyses of data convenient and reliable. Taking into account the variables such as the landslide deformation rate, rainfall, reservoir water level change, maximum water level change rate and submergence degree, the paper analyzes the fording landslides based on grey correlation analysis. In the stage of falling water level, the deformation of the soil landslide is greatly affected by the reservoir water level. In the stage of rising water level, the deformation of the upper part of the soil landslide is radically affected by rainfall, while the lower part of the soil landslide is affected by the water level. Generally speaking, the rock landslide is always the most affected by the reservoir water level.

Key words:Three Gorges reservoir area; fording landslide; influencing factors; grey correlation degree; weight analysis