Numerical analysis of initiation and progressive failure in natural rock slopes—the 1991 Randa rockslide

Eberhardt, E.; Stead, Doug; Coggan, John

doi:10.1016/s1365-1609(03)00076-5

Cited by 525 publications

(314 citation statements)

References 21 publications

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“…Gunzberger et al, 2005), microseismic cyclic 67 loading theoretically relies on an extremely high number of effective (damaging) load cycles 68 to exert any significant geomorphic consequence, since the damage increment resulting from 69 each loading cycle is likely to be exceedingly small, yet not cumulatively negligible ( resulting from, for example, time-dependent creep and fatigue processes driven by subcritical 209 crack growth (Rosser et al, 2007). In turn, this can cause stress redistribution and further 210 microcrack damage in a progressive failure process (Terzaghi, 1962;Bjerrum, 1967; 211 Eberhardt et al, 2004), causing the crack damage threshold, σ cd , to be exceeded, triggering a 212 transition from secondary to tertiary creep and, ultimately, rupture (Petley et al, 2005a, b). 213…”

Section: Introduction and Scope 37mentioning

confidence: 99%

Are microseismic ground displacements a significant geomorphic agent?

et al. 2014

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Abstract 5 This paper considers the role that microseismic ground displacements may play in fracturing 6 rock via cyclic loading and subcritical crack growth. Using a coastal rock cliff as a case 7 study, we firstly undertake a literature review to define the spatial locations that may be prone 8 to microseismic damage. It is suggested that microseismic weakening of rock can only occur 9 in 'damage accumulation zones' of limited spatial extent. Stress concentrations resulting from 10 cliff height, slope angle and surface morphology may nucleate and propagate a sufficiently 11 dense population of microcracks that can then be exploited by microseismic cyclic loading. 12We subsequently examine a 32-day microseismic dataset obtained from a coastal cliff-top 13 location at Staithes, UK. The dataset demonstrates that microseismic ground displacements 14 display low peak amplitudes that are punctuated by periods of greater displacement during 15 storm conditions. Microseismic displacements generally display limited preferential 16 directivity, though we observe rarely occurring sustained ground motions with a cliff-normal 17 component during storm events. High magnitude displacements and infrequently experienced 18 ground motion directions may be more damaging than the more frequently occurring, 19 reduced magnitude displacements characteristic of periods of relative quiescence. As high 20 magnitude, low frequency events exceed and then increase the damage threshold, these 21 extremes may also render intervening, reduced magnitude microseismic displacements 22 ineffective in terms of damage accumulation as a result of crack tip blunting and the 23 2 generation of residual compressive stresses that close microcracks. We contend that damage 24 resulting from microseismic ground motion may be episodic, rather than being continuous 25 and in (quasi-)proportional and cumulative response to environmental forcing. A conceptual 26 model is proposed that describes when and where microseismic ground motions can operate 27 effectively. We hypothesise that there are significant spatial and temporal limitations on 28 effective microseismic damage accumulation, such that the net efficacy of microseismic 29 ground motions in preparing rock for fracture, and hence in enhancing erosion, may be 30 considerably lower than previously suggested in locations where high magnitude 31 displacements punctuate 'standard' displacement conditions. Determining and measuring the 32 exact effects of microseismic ground disp...

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Section: Introduction and Scope 37mentioning

confidence: 99%

Are microseismic ground displacements a significant geomorphic agent?

et al. 2014

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“…The strength parameters are determined by using the softening coefficient (α), and the new parameters are put into the elastic-plastic calculation. A progressive homogeneous reduction of the cohesion was applied to destabilize the slope, and this method is considered to be the principle for the stability analysis of gravity-induced landslides (Martel et al 2003;Eberhardt 2004;Eberhardt 2008;Chemenda et al 2009). This assumption is also made in most geotechnical applications and it was adopted in this study.…”

Section: Numerical Modelling Methodsmentioning

confidence: 99%

Progressive modelling of the gravity-induced landslide using the local dynamic strength reduction method

Chen

Huang

et al. 2013

J. Mt. Sci.

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Abstract:The failure of slope is a progressive process, and the whole sliding surface is caused by the gradual softening of soil strength of the potential sliding surface. From this viewpoint, a local dynamic strength reduction method is proposed to capture the progressive failure of slope. This method can calculate the warning deformation of landslide in this study. Only strength parameters of the yielded zone of landslide will be reduced by using the method. Through continuous local reduction of the strength parameters of the yielded zone, the potential sliding surface developed gradually and evolved to breakthrough finally. The result shows that the proposed method can simulate the progressive failure of slope truly. The yielded zone and deformation of landslide obtained by the method are smaller than those of overall strength reduction method. The warning deformation of landslide can be obtained by using the local dynamic strength reduction method which is based on the softening characteristics of the sliding surface.

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“…-the geomechanical features are de ned coupling all available information [32]. When necessary, the geomechanical properties were also integrated with values from the literature [52,53]. All the properties of Flysch and Marl are reported in Table 4.…”

Section: Flysch DI Bergamo Joint Set Dip Direction (°) Dip (°) Persismentioning

confidence: 99%

The risk of collapse in abandoned mine sites: the issue of data uncertainty

et al. 2016

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Abstract:Ground collapses over abandoned underground mines constitute a new environmental risk in the world. The high risk associated with subsurface voids, together with lack of knowledge of the geometric and geomechanical features of mining areas, makes abandoned underground mines one of the current challenges for countries with a long mining history. In this study, a stability analysis of Montevecchia marl mine is performed in order to validate a general approach that takes into account the poor local information and the variability of the input data. The collapse risk was evaluated through a numerical approach that, starting with some simplifying assumptions, is able to provide an overview of the collapse probability. The nal results is an easy-accessible-transparent summary graph that shows the collapse probability. This approach may be useful for public administrators called upon to manage this environmental risk. The approach tries to simplify this complex problem in order to achieve a roughly risk assessment, but, since it relies on just a small amount of information, any nal user should be aware that a comprehensive and detailed risk scenario can be generated only through more exhaustive investigations.

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Numerical analysis of initiation and progressive failure in natural rock slopes—the 1991 Randa rockslide

Cited by 525 publications

References 21 publications

Are microseismic ground displacements a significant geomorphic agent?

Are microseismic ground displacements a significant geomorphic agent?

Progressive modelling of the gravity-induced landslide using the local dynamic strength reduction method

The risk of collapse in abandoned mine sites: the issue of data uncertainty

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