Hazard Zoniton Of Loess Slopes Geological Disasters In Baoji

In China, 1/3 of geological disasters occurred in the loess area, and the loess landslides are the most common disasters of geological disasters in these areas. In the region of Baoji, there are many types of loess landforms, and loess strata are distributied widely with large thickness, fine grains, and loose and uniform textures as well as vertical joints. Such special physical mechanical properties of loess make slope geological hazards, such as landslides and collapses, occur frequently with large scales and quantities, complicated features and serious consequences that threaten the pepole's live and property, safety of traffic, industrial and agricultural facilities, and deteriorate ecological environment and hinder the social development of the region seriously. Based on the projects, on the basis of the finished geology survey, further systemic summarizing and improving, and find out regularity and the main inducing agent of the landslide disasters in the loess region, forming susceptibility and risk classification standard of landslides in the loess region of Baoji, then realize loess landslides susceptibility zoning and danger division, and provides the basis for the prevention of the loess landslide disasters. The specific research content as follows:(1) Summarizing the developmental characteristics of loess slopes disasters in the region of Baoji: On the basis of geological hazard survey in the loess region of baoji, then research the distribution characters of loess landslides, and study on endogenic and exogenic geological effect in the formation procedure of loess disasters in Baoji;(2) Constructing the hazard evaluation index system of loess slopes disasters: Landslides in loess region of Baoji as the research objects, according to research in loess landslide characteristics, the selection of the main influencing factors, such as landform features, meteorological hydrological conditions, engineering geology rock group characteristics, geological tectonic units, slope structure types, human engineering activities as loess landslide disaster, initially established risk evaluation index system and the classification standard of loess landslide in the region of Baoji;(3) The susceptibility evaluation of geological disasters of the loess slopes in Baoji: Make use of information model combined with ARCGIS, according to the detailed investigation data of the geological disaster, extracting influencing factors and superimposing, determining the value of index information using of information model and overlying the factors layers, hereby partition the degree of susceptibility landslide disaster of loess region in Baoji, eventually obtaining geo-hazard susceptibility zoning maps of loess landslide disaster area;(4) Hazard assessment of landslides in the loess region of Baoji: Based on the susceptibility evaluation of loess landslides geo-hazards in Baoji, take into account of rainfall which the main inducing agent, establish loess slope instability criterion Baoji, combine qualitative analysis with quantitative evaluation to analysis loess landslides hazards, consider the loess landslides hazards elements comprehensively, from the stability of the existing geological disaster, deformation history, the maximum distance of the potential slip, extended range frequency of history collapse and landslide. Establish the risk criterion and grading standards of loess landslides, evaluate the loess landslides hazards in Baoji, and draw up the landslide hazards zoning map for the loess region of Baoji.