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HAZARD MAPPING OF LANDSLIDES, A COMPARISON OF THREE DIFFERENT OVERVIEW MAPPING METHODS IN FINE-GRAINED SOILS (2008)

The aim of the study was to apply hazard mapping methods which are used in Sweden, Norway and Canada for fine-grained soils, on the Åby test site and to evaluate the differences in-between them. In these countries the soil conditions are quite similar. During and after the latest deglaciation soft clays were deposited along coastlines, lakes and valleys in which many large landslides have occurred. A special type of sensitive clay, quick clay, may be found in the countries studied. The chosen test site, Åby, is located in the south-western part of Sweden close to the Göta River. The main purposes of all of the studied methods are to identify areas with a hazard for landslide and to point out areas which need further investigations. The studied methods use criteria mainly based on geological and topographical conditions, earlier events and the possibility for erosion. Based on these conditions and the criteria set up, all methods divide the investigation area into different hazard zones. The application show that all methods indicate that there is a hazard for landslides and a need for further, more detailed geotechnical investigations and stability analyses in some part of the area. The largest differences between the results are the shape, the size and the number of hazard zones
Reference:
4th Canadian Conference on Geohazards : From Causes to Management, J. Locat, D. Perret, D. Turmel, D. Demers et S. Leroueil
Organization:
Swedish Geotechnical Institute
Sweden
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