Structural analysis of a recent rockslide in Southern Stockholm

Abstract: The present Bachelor thesis is written about a rock slide which took place in the southern part of Stockholm in the early 2000s. The studied area is located relatively close to a steeply-dipping fault with NW-SE orientation. The field work was carried out by four students, with me and other student focussing on the rock slide slope and two scan lines N and E of the rock slide. The geological structures, which were assumed to be responsible for the rock slide, have been studied carefully during surface mapping. The data was analysed using two rock mass classifications and stereographic projection. Additionally, a digital elevation map of the area was analysed in terms of slope angle distributions using GIS. It was shown that the orientation of discontinuities at the site coincides with the direction of the cutting work. Thus, the rock slide was unavoidable since the cutting work was carried out subparallel to the fractures main orientation.