Study On The Formulation Mechanism Of Geological Hazards In The Mountainous Area Of Southern Ningxia

The mountainous area of southern Ningxia is the most developed areas of geological hazards. Landslide is the main geological hazards, accompanied by collapse, debris flow and so on. Many new potential points of geo-hazards appear in the flood season each year, with Characteristics of sudden, group-occurring and grate damage. The local people's lives and property are seriously threatened. Studying on the formulation mechanism of geological hazards in different geological environments can provide reliable theoretical basis for disaster prevention and reduction and engineering construction. It has theoretical and practical significance on minimizing the life and property loss, strengthening social stability, formulating development plans, promoting the protecting of geological environment and harmonious development between social economic growth.Taking the main geological hazards in the mountainous area of southern Ningxia as research subjects, the mechanism of loess layer landslide, collapse, loess seismic landslide, loess bedrock landslide and debris flow is studied in the thesis with the beginning of geological environmental conditions research and on the basis of the investigation of geological hazards of county (city). Firstly, the main types of geological hazards are identified and the basic characteristics and distribution in space and time of collapse, landslide, debris flow and unstable slope are analyzed, based on a brief analysis of the regional geological environment; Secondly, the relationship between the formation of geological hazards and topography, formation lithology, geological structures, seismic, neotectonic movement, hydrogeological and human engineering activities are analyzed,then drawed the conclusion that loess hilly region's deep ravines, the presence of loess and mud slippery formation, the strongest movement since the late Pleistocene neotectonic and ground water are the internal conditions of landslide, earthquakes, precipitation and human engineering activities are the main inducing factors of landslide. Earth and Rock Mountain steep terrain and strong weathering of Cretaceous shale are the internal conditions of debris flow, rainfall is the main inducing factor. Finally, the relationship between the layer of loess landslides, collapse, loess seismic landslides, loess bedrock landslide and slope, slope pattern, rainfall, human engineering activities are simulated by GEO-SLOPE software. Then the mode of deformation and failure of loess landslide is proposed and the characteristics in the distribution, formation conditions and movement mechanism of debris flow are analyzed.