| The thesis relies on the project "geology hazard detailed investigationproject of Anhua county Hunan province ". mapping and engineering survey as themain means to study the distribution of geological disasters Anhua territory,developmental characteristics, as well as the formation of geological disastersenvironmental conditions. On this basis, select the key indicators to measuregeological hazards, combined with data processing, integrated use of methodscontribution rate method, multivariate statistical methods, GIS modelcalculation, geological disaster-prone evaluation, geological hazardassessment. The main results of this study include:1.The main types of geological disasters Anhua unstable slopes, landslides,avalanches, landslides, ground subsidence, ground fissures and other six kinds.Where the largest number of the most harmful geological disasters as landslides,the study found the same kind of geological disasters in the distribution ofdevelopment has certain characteristics.2.Anhua territory dominated by small landslide hazards; material typelandslide in gravel soil, soil-based; landslide terrain impact, the highestprobability of landslide sliding bed dip occurred between30°~60°. Mudslidesformed mainly in valleys and hillsides shape. Divided by material composition,collapse to collapse dominated rock.3.Geological disaster occurs mainly hilly topography, major development inthe type of semi-hard rock thick layer to the thin slate group, slope structuretypes are mainly developed for the forward slope, geological hazards and faultsare closely related, Precipitation is the main trigger factors of geologicaldisasters, geological disasters affected by human activity is apparent.Evaluation methods using a combination of qualitative and quantitative divisionof geological disaster-prone areas can be prone to geological disasters of thecounty area is divided into three levels: high-prone areas, medium-prone areas,low-prone areas. 4. According to the distribution, the difference between the degree of riskassessment of geological disaster-prone full consideration of the geologicalsurvey area environmental conditions and potential geological disaster point,using qualitative and semi-quantitative analysis, the county’s geologicalhazard classification three levels: the risk of a large area in dangerous areas,dangerous district. |
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