Main Geological Disasters Risky District Appraisal And Evaluation Of Shaanxi's Highways

Conducting the highway geological disasters appraisal would be beneficial to increase the level of prevention and reduction of natural disasters, and it also can reduce the influences to the transportation caused by the geological disasters. Shaanxi Province is one of the provinces which suffer great geological disasters and various kinds of disasters, high frequency and wide distribution range are features of this area.Moreover, it has a tendency to be worse. The frequent geological disasters happenings make severely negative influences on the highway projects. District appraisal of the highway geological is a practical means to control and manage the disasters, because it can veritably reflect the features and distributions of geological disasters in Shaanxi Province. Meanwhile, it also could provide us with reference and conduction to the traffic plans, survey and design, construction and the later period maintenance of Shaanxi, so as to reduce the loss caused by the geological disasters.This article takes the main geological disasters risky district appraisal and the evaluation of Shaanxi's highways as the research subject, and it first analyzes the Shaanxi Province's terrain landform, the ground types, the geologic structures, the hydrologic geology, the climatic conditions, the river system distributions, the soil and the vegetation coverings, the earthquakes and so on which are the frequent geological disasters' geological project condition and the dynamic environments. At the same time, it analyzes the Shaanxi geology disasters' present situation, especially conducts a research on the classification and distribution of avalanche, landslide, mud-rock flowing which are the main geological disasters in Shaanxi.Secondly, it makes the analysis of the relationship between avalanche, landslide, mud-rock flowing with the influential factors, project geological and dynamic environments. It further points out the index system of the main geological disasters risk evaluations. Then, it puts forward the way of transmitting and normalization processing the values of the index data attributes, of which make uses the experts' remarks and analytic hierarchy process to perform the fixation of the main geological risk evaluation's index weighting. Furthermore, it draws up the map of Shaanxi's main highway geological disasters risk level on the platform of Arc Gis 9.2.Finally, using the regionalization method of "top-down" combining "bottom-up" and man-machine interaction way, we have conducted the risky district plan research, proposed the Shaanxi highway main geological disasters risky distribution project and carried on the illustration of district appraisals.