Kinematics and 3-D internal deformation of granular slopes: analogue models and natural landslides
2013 (English)In: Journal of Structural Geology, ISSN 0191-8141, Vol. 53, 27-42 p.Article in journal (Refereed) Published
This study uses results from a series of analogue models, and field observations, scanned data and sections of natural landslides to investigate the kinematics and internal deformation during the failure of an unstable slope. The models simulate collapse of granular slopes and focus on the spatial and temporal distribution of their internal structures. Using a series of systematically designed models, we have studied the effect of friction and deformability of the runout base on internal deformation within a granular slope. The results of these different models show that the collapse of granular slopes resulted in different-generation extensional faults at the back of the slope, and contractional structures (overturned folds, sheath folds and thrusts) at the toe of the slope. The failure surfaces and the volume of the failure mass changed both spatially and temporally. Younger failure surfaces formed in the back of the older ones by incorporating additional new material from the head of the slope. Our model results also show that the nature of the runout base has a significant influence on the runout distance, topography and internal deformation of a granular slope. Model results are compared with natural landslides where local profiles were dug in order to decipher the internal structures of the failure mass. The natural cases show similar structural distribution at the head and toe of the failure mass. As in model results, our field observations indicate the presence of at least two generations of failure surfaces where the older ones are steeper.
Place, publisher, year, edition, pages
2013. Vol. 53, 27-42 p.
Granular slopes, Analogue models, Landslides, Internal deformation, Runout base
Geology Earth and Related Environmental Sciences
Research subject Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
IdentifiersURN: urn:nbn:se:uu:diva-188231DOI: 10.1016/j.jsg.2013.05.010ISI: 000322805600003OAI: oai:DiVA.org:uu-188231DiVA: diva2:576899