Forensic investigation of quick clay landslide released by construction work at Asak, Norway
Forensic investigation of quick clay landslide released by construction work at Asak, Norway
In November 2016, a quick clay landslide was triggered at Asak in Eastern Norway. The landslide occurred in an area where a landfill was under construction. Six persons worked in the forest downslope of the area at the time of the landslide. Three of these were able to escape from the landslide runout, while three were killed. After the event, NGI investigated the cause of the landslide using available and new information. An important part of the documentation was reconstruction of the landfill work prior to the landslide release, using satellite images and other evidence. The slope geometry previous to the failure was reconstructed, and stability calculations were done based on ground investigations performed outside the landslide area. The performed analyses confirmed that the landfill, although reducing the slope inclination, had resulted in a drastic reduction in the undrained stability. Stability calculations performed with LEM and FEM methods to investigate the probable geometry of the failure plane matched well with field observations.
H. Heyerdahl; A. M. W. Amdal; Regula Frauenfelder; K. Sverdrup-Thygeson; A. O. K. Lysdahl
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
B - Geohazards
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