关键词: 地质灾害, 发育规律, 成因机制, 珠江-西江经济带

Abstract: In order to find out the development characteristics and temporal-spatial distribution of geological disasters in Wuzhou district of Pearl River-Xijiang River Economic Belt, analyze its genetic mechanism, and provide reference for regional land planning, the major engineering construction, regional disaster prevention and mitigation, the types, scale, development characteristics and temporal-spatial distribution of geological disasters were statistically analyzed based on the detailed survey data. A total of 151 geohazards were investigated in the study area, including landslide, collapse (dangerous rock), unstable slope and 2 debris flows. The scale of disaster was mainly small. In space scale: 70% of the geohazards were distributed in the height of 50 to 150 m, more than 75% of the geohazards distributed in the slope of 25~55 degrees, more than 55% of them developed in the slope of consequent and reverse structures, which develop along the main structural faults in a strip-shape . In time scale: the geohazards mostly happened in May to August in rainy season. In lithology: more than 80% of the geohazards were developed in Cambrian and Sinian clastic rocks. The characteristics of geohazards in the study area were large quantiyty, wide area and small volume. The internal controlling factors of geohazards mechanism were topography, stratigraphy, lithology, slope structure and geological structure; the external controlling factors were rainfall, rising and falling of river water and human engineering activities.

Key words: geological hazard, development law, genetic mechanism, Pearl River-Xijiang River Economic Belt