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The impact of a weak horizon on kinematics and internal deformation of a failure mass using discrete element method
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
2013 (English)In: Tectonophysics, ISSN 0040-1951, E-ISSN 1879-3266, Vol. 586, p. 95-111Article in journal (Refereed) Published
Abstract [en]

Weak horizons within slopes may induce and/or accelerate failure of slopes. In this study, we focus on the effect of orientation, location and dimension of a weak horizon on the mode and kinematics of downslope movement of a failure mass using discrete element method. Two kinds of cases with weak horizons were studied, one unstable homogeneous slope with low shear strength (c = 50 kPa, μ = 0.57) and two stable homogeneous slopes with high shear strength (c = 60 kPa, μ = 0.57 or c = 50 kPa, μ = 0.7). In the three set of slope models, there was a weak horizon with a finite thickness embedded within the slope. In each set of slope models, two different thicknesses and locations for the weak horizons were considered to systematically investigate the effect of these parameters on the mass movement. In addition, the dip of the weak horizon was changed where in some models, it was parallel to the slope and in others it was dipping either steeper or gentler than the slope. We analyzed both kinematics and internal deformation of the failure mass in all models and conclude that the presence and geometry (i.e., thickness, location and dip) of a weak horizon changes the mode and kinematics of mass movement and governs the location of the failure surface.

Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 586, p. 95-111
Keywords [en]
slope stability; weak horizon; particle flow method; internal deformation; kinematics
National Category
Earth and Related Environmental Sciences Geology
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
URN: urn:nbn:se:uu:diva-188513DOI: 10.1016/j.tecto.2012.11.009ISI: 000316591200007OAI: oai:DiVA.org:uu-188513DiVA, id: diva2:578044
Available from: 2012-12-17 Created: 2012-12-17 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Kinematics and Internal Deformation of Granular Slopes
Open this publication in new window or tab >>Kinematics and Internal Deformation of Granular Slopes
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Flow-like mass movement is the most destructive landslide and causes loss of lives and substantial property damage throughout the world every year. This thesis focuses on the spatial and temporal changes of the mass movement in terms of velocity and displacement within the failure mass, and the spatial and temporal distribution of the three dimensional internal deformation of the granular slopes using discrete element method, physical experiments, and natural landslides. We have also studied the effect of weak horizons on the kinematics and internal deformation of granular slopes. Numerical model results show the following features related to a failure mass. The failure mass flows downwards in an undulating pattern with a distinctive velocity heterogeneity. Dilatation within the failure mass is strongly dependent on its mechanical properties. A larger mass moves downslope and the mass moves faster and further in the model with lower internal friction and cohesion. The presence of weak horizons within the granular slope strongly influences displacement, location of the failure surface, and the amount of the failure mass. In addition, results from analogue models and natural landslides are used to outline the mode of granular failure. The collapse of granular slopes results in different-generation extensional faults in the back of the slope, and contractional structures (overturned folds, sheath folds and thrusts) in the toe of the slope. The first-generation normal faults with a steep dip (about 60º) cut across the entire stratigraphy of the slope, whereas the later-generation normal faults with a gentle dip (about 40º) cut across the shallow units. The nature of the runout base has a significant influence on the runout distance, topography and internal deformation of a granular slope. Good agreements are found between models and nature for the collapse of granular slopes in terms of the similar structural distribution in the head and toe of the failure mass and different generations of failure surfaces. The presence of a weak horizon within the granular slope has a significant influence on the granular failure and three dimensional internal deformation of the failure mass.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2014. p. 39
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1153
Keywords
granular flow, kinematics, internal deformation, particle flow method, analogue modeling, natural landslides
National Category
Geology
Research subject
Earth Science with specialization in Mineral Chemistry, Petrology and Tectonics
Identifiers
urn:nbn:se:uu:diva-223792 (URN)978-91-554-8968-7 (ISBN)
Public defence
2014-06-13, Hambergsalen, Geocentrum, Villavägen 16, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2014-05-23 Created: 2014-04-25 Last updated: 2014-06-30

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Liu, ZhinaKoyi, Hemin

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