Influence of Kinematics on Landslide Mobility and Failure Mode

Sitar, Nicholas; MacLaughlin, Mary; Doolin, David M.

doi:10.1061/(asce)1090-0241(2005)131:6(716)

Cited by 92 publications

(58 citation statements)

References 16 publications

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“…After that time, the sliding velocity decreases gradually until the solid mass finally reaches a static state. When compared with the numerical results by the discontinuous deformation analysis (DDA) from Sitar et al (2005), the current DEM simulation can predict almost the same maximum slope velocity.…”

Section: Slope Velocity Analysismentioning

confidence: 88%

“…The initial reservoir level and water table are placed at about 700 m above the sea level as the real water level at the time of slope failure. As the western slope sliding (section B-B) is believed to be more significant at dominating the wave motion and the consequent reservoir overtopping (Crosta et al 2013;Hendron and Patton 1987;Sitar et al 2005) several different simulations of the western slope failure have been performed, by changing the fluid viscosity and coarse grain scaling factors.…”

Section: Coarse Grain Modelmentioning

confidence: 99%

“…According to the discussion by Sitar et al (2005) and Caloi (1966), part of the slide mass has moved more than 400 m in less than 60 s. Previously published papers indicate that the average maximum slide velocity can range from 20 to 50 m/s (Hendron and Patton 1987). Several hypotheses have been proposed to explain the unusual high velocity, including the reduction of shear strength, weak layer beneath the slope, disintegration of the slide mass (Hendron and Patton 1987;Voight and Faust 1982;Sitar et al 2005). In this paper, we have investigated the slope velocity by the DEM simulations.…”

Section: Slope Velocity Analysismentioning

confidence: 99%

“…30 m/s) (Ciabatti 1964;Chen et al 2006;Crosta et al 2013) is still an important research subject. Many theories and assumptions have been proposed in the attempt to explain the apparent high mobility of rock and debris avalanches, and in particular, for the Vajont rockslide these theories include the thermo-poro-mechanical effects at the clay layer due to heating (Voight and Faust 1982;Vardoulakis 2002;Alonso and Pinyol 2010;Pinyol and Alonso 2010), high shearing rate-induced friction loss (Tika and Hutchinson 1999;Ferri et al 2011) and disintegration of the rockslide mass during the failure (Sitar et al 2005).…”

Section: Introductionmentioning

confidence: 99%

“…Currently, there is a lot of interests in exploring the failure mechanism and characteristics of fast and long runout rockslides via numerical modelling (Utili et al 2014;Crosta et al 2013;Sitar et al 2005;Zhao et al 2012;Boon 2013;Quecedo et al 2004;Crosta et al 2006Crosta et al , 2009Crosta and Frattini 2008). In this paper, a quasi-3D DEM-CFD model is used to investigate the mechanical and hydraulic behaviour of the Vajont rockslide.…”

Section: Introductionmentioning

confidence: 99%

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Rockslide and Impulse Wave Modelling in the Vajont Reservoir by DEM-CFD Analyses

2015

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This paper investigates the generation of hydrodynamic water waves due to rockslides plunging into a water reservoir. Quasi-3D DEM analyses in plane strain by a coupled DEM-CFD code are adopted to simulate the rockslide from its onset to the impact with the still water and the subsequent generation of the wave. The employed numerical tools and upscaling of hydraulic properties allow predicting a physical response in broad agreement with the observations notwithstanding the assumptions and characteristics of the adopted methods. The results obtained by the DEM-CFD coupled approach are compared to those published in the literature and those presented by Crosta et al. (Landslide spreading, impulse waves and modelling of the Vajont rockslide. Rock mechanics, 2014) in a companion paper obtained through an ALE-FEM method. Analyses performed along two cross sections are representative of the limit conditions of the eastern and western slope sectors. The max rockslide average velocity and the water wave velocity reach ca. 22 and 20 m/s, respectively. The maximum computed run up amounts to ca. 120 and 170 m for the eastern and western lobe cross sections, respectively. These values are reasonably similar to those recorded during the event (i.e. ca. 130 and 190 m, respectively). Therefore, the overall study lays out a possible DEM-CFD framework for the modelling of the generation of the hydrodynamic wave due to the impact of a rapid moving rockslide or rock-debris avalanche.

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Section: Slope Velocity Analysismentioning

confidence: 88%

Section: Coarse Grain Modelmentioning

confidence: 99%

Section: Slope Velocity Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rockslide and Impulse Wave Modelling in the Vajont Reservoir by DEM-CFD Analyses

2015

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Rock slope instability assessment using spatially distributed structural orientation data in Darjeeling Himalaya (India)

Ghosh

Günther

Carranza

et al. 2010

Earth Surf Processes Landf

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We discuss a geographic information system (GIS)-based methodology for rock slope instability assessment based on geometrical relationships between topographic slopes and structural discontinuities in rocks. The methodology involves (a) regionalization of point observations of orientations (azimuth and dip) of structural discontinuities in rocks in order to generate a digital structural model (DStM), (b) testing the kinematical possibility of specifi c modes of rock slope failures by integrating DStMs and digital elevation model (DEM)-derived slope and aspect data and (c) computation of stability scenarios with respect to identifi ed rock slope failure modes. We tested the methodology in an area of 90 km 2 in Darjeeling Himalaya (India) and in a small portion (9 km 2 ) within this area with higher density of fi eld structural orientation data. The results of the study show better classifi cation of rock slope instability in the smaller area with respect to known occurrences of deep-seated rockslides than with respect to shallow translational rockslides, implying that structural control is more important for deep-seated rockslides than for shallow translational rockslides. Results of scenario-based analysis show that, in rock slopes classifi ed to be unstable, stressinduced rock slope instability tends to increase with increasing level of water saturation. The study demonstrates the usefulness of spatially distributed data of orientations of structural discontinuities in rocks for medium-to small-scale classifi cation of rock slope instability in mountainous terrains.

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Block fracturing analysis using nodal‐based discontinuous deformation analysis with the double minimization procedure

Tian

Zhao

Bao³

2013

Num Anal Meth Geomechanics

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SUMMARYAs a hybrid method, the nodal‐based discontinuous deformation analysis (NDDA) greatly improves the stress accuracy within each DDA block by coupling a well‐defined finite element mesh inside the DDA block; at the same time, the NDDA inherits the unique block kinematics of the standard DDA method. Each finite element mesh line inside the DDA block is treated as a potential crack, which enables the transformation of the block material from continuum to discontinuum through the tensile and shear fracturing mechanism. This paper introduces a double minimization procedure into the NDDA method to further improve the accuracy of the stresses evaluated at the finite element mesh lines and thus to obtain a more realistic fracture model. Three numerical examples are employed to demonstrate the improved stress accuracy by the implemented double minimization procedure and the accuracy and capability of the enhanced NDDA method in capturing brittle fracturing process. Copyright © 2013 John Wiley & Sons, Ltd.

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Influence of Kinematics on Landslide Mobility and Failure Mode

Cited by 92 publications

References 16 publications

Rockslide and Impulse Wave Modelling in the Vajont Reservoir by DEM-CFD Analyses

Rockslide and Impulse Wave Modelling in the Vajont Reservoir by DEM-CFD Analyses

Rock slope instability assessment using spatially distributed structural orientation data in Darjeeling Himalaya (India)

Block fracturing analysis using nodal‐based discontinuous deformation analysis with the double minimization procedure

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