New insights into the 1963 Vajont slide using 2D and 3D distinct-element method analyses

Boon, Chia Weng; Houlsby, G. T.; Utili, Stefano

doi:10.1680/geot.14.p.041

Cited by 62 publications

(24 citation statements)

References 45 publications

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“…Broili 1967;Ciabatti 1964;Semenza and Ghirotti 2000;Hendron and Patton 1985;Müller 1964;Sitar et al 2005;Vardoulakis 2000;Veveakis et al 2007;Pinyol and Alonso 2010;Boon et al 2014) because of its nature, the catastrophic consequences and the unexpected effects, and the availability of pre-and post-failure observations (Selli and Trevisan 1964;Rossi and Semenza 1965;Müller 1964;Belloni and Stefani 1987). The rockslide formed by two major masses (eastern and western), underlined on the upper slope by a long M-shaped tension crack, moved along a chair-like sliding surface with a relatively flat toe and a steep back (25°-43°) and the eastern and western sectors of the sliding surface slightly dipping towards each other.…”

Section: Vajont Rockslidementioning

confidence: 99%

Landslide Spreading, Impulse Water Waves and Modelling of the Vajont Rockslide

Crosta

Imposimato²,

Roddeman³

2015

Rock Mech Rock Eng

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Landslides can occur in different environments and can interact with or fall into water reservoirs or open sea with different characteristics. The subaerial evolution and the transition from subaerial to subaqueous conditions can strongly control the landslide evolution and the generated impulse waves, and consequently the final hazard zonation. We intend to model the landslide spreading, the impact with the water surface and the generation of the impulse wave under different 2D and 3D conditions and settings. We verify the capabilities of a fully 2D and 3D FEM ALE approach to model and analyse near-field evolution. To this aim we validate the code against 2D laboratory experiments for different Froude number conditions (Fr = 1.4, 3.2). Then the Vajont rockslide (Fr = 0.26-0.75) and the consequent impulse wave are simulated in 2D and 3D. The sliding mass is simulated as an elasto-plastic Mohr-Coulomb material and the lake water as a fully inviscid low compressibility fluid. The rockslide model is validated against field observations, including the total duration, the profile and internal geometry of the final deposit, the maximum water run-up on the opposite valley flank and on the rockslide mass. 2D models are presented for both the case of a dry valley and that of the impounded lake. The set of fully 3D simulations are the first ones available and considering the rockslide evolution, propagation and interaction with the water reservoir. Advantages and disadvantages of the modelling approach are discussed.

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Section: Vajont Rockslidementioning

confidence: 99%

Landslide Spreading, Impulse Water Waves and Modelling of the Vajont Rockslide

Crosta

Imposimato²,

Roddeman³

2015

Rock Mech Rock Eng

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“…The work presented here is part of a research effort to extend the DEM modelling of landslides [28][29][30] to the submerged case. The paper is organised as follows.…”

Section: Introductionmentioning

confidence: 99%

Investigation of granular batch sedimentation via DEM–CFD coupling

2014

Self Cite

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process, the excess pore water pressure initially increases rapidly to a peak value, and then dissipates gradually to zero. Meanwhile, the compressibility of the sediments decreases slowly as a soil layer builds up at the bottom. Consolidation of the deposited layer is caused by the self-weight of grains, while the compressibility of the sample decreases progressively.Keywords: granular batch sedimentation, DEM-CFD coupling, segregation, pore water pressure, effective stress, compressibility IntroductionThe sedimentation and consolidation processes of granular materials are common in both terrestrial and submerged environments. In the natural environment, granular materials often settle continuously towards the seabed, lake or river floor to form a loose sediment layer. As the skeleton of the sediment layer is extremely compressible, it undergoes relatively large strain under additional loads. Sedimentation processes are very important for solid-liquid 1 2

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“…As an implicit and displacement‐based method, DDA have been successfully implemented on both static and dynamic problems in rock engineering . In the past decades, many improvements have been made on the discontinuous computation framework for the analyses of rock slides, tunnels, seismic site response, rock fragmentation, rock dynamics, hydraulic fracturing, and thermo‐hydro‐mechanical problems . Meanwhile, the implementation of three‐dimensional DDA has gained popularity in various rock engineering problems …”

Section: Introductionmentioning

confidence: 99%

Modified predictor‐corrector solution approach for efficient discontinuous deformation analysis of jointed rock masses

Zheng

Leung

Zhu

et al. 2018

Num Anal Meth Geomechanics

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Summary The high computational costs associated with the implicit formulation of discontinuous deformation analysis (DDA) have been one of the major obstacles for its implementation to engineering problems involving jointed rock masses with large numbers of blocks. In this paper, the Newmark‐based predictor‐corrector solution (NPC) approach was modified to improve the performance of the original DDA solution module in modeling discontinuous problems. The equation of motion for a discrete block system is first established with emphasis on the consideration of contact constraints. A family of modified Newmark‐based predictor‐corrector integration (MNPC) scheme is then proposed and implemented into a unified analysis framework. Comparisons are made between the proposed approach and the widely used constant acceleration (CA) integration approach and central difference (CD) approach, regarding the stability and numerical damping features for a single‐degree‐of‐freedom model, where the implications of the proposed approach on open‐close iteration are also discussed. The validity of the proposed approach is verified by several benchmarking examples, and it is then applied to two typical problems with different numbers of blocks. The results show that the original CA approach in DDA is efficient for the simulation of quasi‐static deformation of jointed rock masses, while the proposed MNPC approach leads to improved computational efficiency for dynamic analysis of large‐scale jointed rock masses. The MNPC approach therefore provides an additional option for efficient DDA of jointed rock masses.

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New insights into the 1963 Vajont slide using 2D and 3D distinct-element method analyses

Cited by 62 publications

References 45 publications

Landslide Spreading, Impulse Water Waves and Modelling of the Vajont Rockslide

Landslide Spreading, Impulse Water Waves and Modelling of the Vajont Rockslide

Investigation of granular batch sedimentation via DEM–CFD coupling

Modified predictor‐corrector solution approach for efficient discontinuous deformation analysis of jointed rock masses

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