A semi-empirical method to assess flow-slide probability
Presented by Dr. Geeralt VAN DEN HAM on 23 Sep 2013 from 12:15 to 12:30
Type: Oral presentation, full-paper
Session: 02: Pore Fluids & Weak Layers
Track: Oral presentations
Flow-slides in submerged slopes in non-lithified sand and silt-sized sediments form a major threat for flood defences along (estuary) coastlines and riverbanks in the Netherlands. Flow slide is a complex failure mechanism including both soil mechanical and hydraulic features. Two important sub-mechanisms are static liquefaction and breaching. Both result in a flowing sand-water mixture, that eventually re-sediments under a gentle slope. Therefore, when analyzing historical flow slides it is often not clear to what extent static soil liquefaction and/or breaching played a role. This paper presents a practical, semi-empirical method for assessing dike failure probability due to flow-sliding. It is based on statistical information about documented historical flow slides, in which the results of complex theoretical models, describing physics of static liquefaction or breach-flow, are incorporated.