Dynamic distinct-element analysis of the 800m high Åknes rock slope

Kveldsvik, Vidar; Kaynia, Amir M.; Nadim, Farrokh; Bhasin, Rajinder; Nilsen, Bjørn; Einstein, Herbert H.

doi:10.1016/j.ijrmms.2008.10.007

Cited by 43 publications

(16 citation statements)

References 20 publications

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“…01 also failed much earlier than the other simulations, which were run with larger damping ratios. Note that some researchers have also found that it was necessary to use at least a very small damping ratio to model an undamped system, that is, to prevent rounding errors from affecting the simulations (Kveldsvik et al, 2009;O'Donovan et al, 2012). For larger viscous damping ratios (î ¼ 0 .…”

Section: Two-dimensional Analysesmentioning

confidence: 99%

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

Boon¹,

Houlsby²,

Utili³

2014

Géotechnique

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The 1963 Vajont rock slide is studied using the distinct-element method (DEM). Two-dimensional (2D) and three-dimensional (3D) DEM models were constructed based on information published in the literature. In this study, a strength reduction approach was used to calculate the slide surface friction angles required for stability. The influence of several parameters was investigated in 2D, namely the reservoir water level, the shear stiffness of the slide surface, the rock mass strength, the rock mass deformability and rock joint patterns. Of the parameters which have been investigated, the most important parameter was found to be the reservoir water level. The rock mass deformability, which is neglected by other investigators, is also found to be important. From the 3D analyses, the failure friction angle was found to be sensitive to the assumptions made on the eastern boundary, and could affect the failure friction angle by approximately 38. The slope was found to exhibit signs of failure beginning from ö slide_surface ¼ 268 before complete loss of resistance at ö slide_surface ¼ 188. It also emerges that, although the eastern end of the slope is the first to exhibit signs of movement, the displacements at the western end of the slope become larger than the ones at the eastern end as the stability of the slope reduces. Finally, this study showcases some useful numerical techniques developed ad hoc for DEM analyses to investigate the stability of large-scale slopes.

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Section: Two-dimensional Analysesmentioning

confidence: 99%

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

Boon¹,

Houlsby²,

Utili³

2014

Géotechnique

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“…seismic) conditions. The distinct element method has been used in various studies and it is particularly suitable for rock slope stability analyses (Kveldsvik et al, 2009;Kainthola et al, 2012;Bhasin and Kaynia, 2004;Esaki et al, 1999;Chuhan et al, 1997).…”

Section: Landslide Analysis With Universal Distinct Element Code (Udementioning

confidence: 99%

Formation, breaching and flood consequences of a landslide dam near Bujumbura, Burundi

Nibigira

Havenith

Archambeau

et al. 2018

Nat. Hazards Earth Syst. Sci.

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Abstract. This paper investigates the possible formation of a landslide dam on the Kanyosha River near Bujumbura, the capital of Burundi, as well as the interplay between the breaching of this landslide dam and the flooding along the river. We present an end-to-end analysis, ranging from the origin of the landslide up to the computation of flood waves induced by the dam breaching. The study includes three main steps. First, the mass movement site was investigated with various geophysical methods that allowed us to build a general 3-D model and detailed 2-D sections of the landslide. Second, this model was used for dynamic landslide process modelling with the Universal Distinct Element Code. The results showed that a 15 m high landslide dam may form on the river. Finally, a 2-D hydraulic model was set up to find out the consequences of the breaching of the landslide dam on flooding along the river, especially in an urban area located downstream. Based on 2-D maps of maximum water depth, flow velocity and wave propagation time, the results highlight that neglecting the influence of such landslide dams leads to substantial underestimation of flood intensity in the downstream area.

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“…[50] (Figure 4). More information about the rock slope geological setting can be found in [51][52][53] and in [54], where the results of extensive field and non-field work activities are summarized, such as geological and geophysical investigations, numerical modelling, etc.…”

Section: Geological and Geomorphological Settingmentioning

confidence: 99%

Space-Borne and Ground-Based InSAR Data Integration: The Åknes Test Site

et al. 2016

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This work concerns a proposal of the integration of InSAR (Interferometric Synthetic Aperture Radar) data acquired by ground-based (GB) and satellite platforms. The selected test site is the Åknes rockslide, which affects the western Norwegian coast. The availability of GB-InSAR and satellite InSAR data and the accessibility of a wide literature make the landslide suitable for testing the proposed procedure. The first step consists of the organization of a geodatabase, performed in the GIS environment, containing all of the available data. The second step concerns the analysis of satellite and GB-InSAR data, separately. Two datasets, acquired by RADARSAT-2 (related to a period between October 2008 and August 2013) and by a combination of TerraSAR-X and TanDEM-X (acquired between July 2010 and October 2012), both of them in ascending orbit, processed applying SBAS (Small BAseline Subset) method, are available. GB-InSAR data related to five different campaigns of measurements, referred to the summer seasons of 2006, 2008, 2009, 2010 and 2012, are available, as well. The third step relies on data integration, performed firstly from a qualitative point of view and later from a semi-quantitative point of view. The results of the proposed procedure have been validated by comparing them to GPS (Global Positioning System) data. The proposed procedure allowed us to better define landslide sectors in terms of different ranges of displacements. From a qualitative point of view, stable and unstable areas have been distinguished. In the sector concerning movement, two different sectors have been defined thanks to the results of the semi-quantitative integration step: the first sector, concerning displacement values higher than 10 mm, and the 2nd sector, where the displacements did not exceed a 10-mm value of displacement in the analyzed period.

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Dynamic distinct-element analysis of the 800m high Åknes rock slope

Cited by 43 publications

References 20 publications

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

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

Formation, breaching and flood consequences of a landslide dam near Bujumbura, Burundi

Space-Borne and Ground-Based InSAR Data Integration: The Åknes Test Site

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