A study of the mechanism of flexural toppling failure of rock slopes

Adhikary, Deepak; Dyskin, Arcady; Jewell, Richard; Stewart, D.P.

doi:10.1007/bf01020126

Cited by 210 publications

(79 citation statements)

References 13 publications

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“…[K] {U} = {F} (2) A vantagem desse tipo de modelagem, no estudo das condições de rupturas por tombamento, é a capacidade de incluir informações geológicas para manter a heterogeneidade do maciço e por tratar, de forma mais realística, algumas limitações encontradas em métodos por equilíbrio limite tais como: poro-pressão, efeitos sísmicos, condições geológicas e geométricas (Pitchard e Savigny, 1990).…”

Section: Revisão Bibliográficaunclassified

Modelagem Numérica Contínua E Equivalente Contínua Para Avaliar Estabilidade De Taludes Suceptíveis a Tombamentos

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Antocheviz

Feitosa

et al. 2016

HOLOS

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RESUMOO estudo da estabilidade de taludes nas bancadas é fato notório e indispensável para eficiência das operações e garantia da segurança em minas a céu aberto. A presença de famílias de descontinuidades, em especial nas cavas de grandes profundidades, pode indicar dentre outras formas de ruptura, instabilidade por tombamento. Este trabalho foi realizado para comparar e discutir os modelos utilizados no entendimento das formas de ruptura por tombamento em uma mina de calcário. Por meio de dados de campo e modelagem por elementos finitos, foram construídos dois modelos: no primeiro, o maciço é tratado como um corpo único, isto é, com as descontinuidades naturais do processo de formação da rocha e caracterizado por meio de classificação geomecânica. Já no segundo modelo, o corpo também é considerado contínuo, mas com as descontinuidades inseridas. Esta modelagem numérica foi realizada com auxílio do software Phase² V.8 da Rocscience. Os resultados revelam semelhanças entre os fatores de segurança em níveis de estabilidade, sendo que no modelo contínuo (mas com descontinuidades inseridas) se observou de forma mais clara as tensões cisalhantes induzidas nas descontinuidades durante o movimento de tombamento. PALAVRAS-CHAVE:Tombamentos, scanline, modelos numéricos, elementos finitos, modelo contínuo. MODELING NUMERICAL EQUIVALENT CONTINUOUS AND CONTINUING TO EVALUATE SLOPE STABILITY SUSCEPTIBLE THE TIPPING ABSTRACTThe study of slope stability in benches is indeed remarkable and indispensable for the efficiency of operations and safety in open pit mines. The presence of discontinuities families, especially in great depths can indicate, among other forms, toppling. This study was conducted to compare and discuss the models used in the understanding of the ways to rupture toppling in a limestone mine. Through the field data and modeling by finite elements, were constructed two models: in the first, the massive is treated as a single body and characterized by means of geomechanical classification. In the second model, the body is also considered continuous, but with inserted discontinuities. The results reveal similarities between the safety factors in stability levels, though in the continuous model (but with inserted discontinuities) was observed more clearly the shear stresses induced in the discontinuities during movement of toppling.

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Section: Revisão Bibliográficaunclassified

Modelagem Numérica Contínua E Equivalente Contínua Para Avaliar Estabilidade De Taludes Suceptíveis a Tombamentos

Costa

Antocheviz

Feitosa

et al. 2016

HOLOS

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“…In the second method, using of large loads in the laboratory such as, Uniaxial, biaxial or triaxial loading, can be applied to strong material such as concrete to simulate rock slopes behavior, [24] used this method to examine the failure of modeled material. The third method involves the using of centrifugal forces to model the increase of height of a slope, [25] and [26] used centrifugal acceleration to model toppling in rock slopes.…”

Section: Physical Modellingmentioning

confidence: 99%

Rock Slopes Processes and Recommended Methods for Analysis

Alzo’ubi¹

2016

Geomate

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ABSTRACT:The stability of rock slopes is of great concern in many engineering projects, for example; road cuts, foundations, retaining walls, and dam excavation. Generally, rock slopes susceptible to instability could be divided into two main categories, the structurally controlled slopes, and the complex rock slopes. In the later, rock slope instability would involve intact material fracturing to allow for rupture surface to be formed. Kinematics of a landslide or the type of movement or instability associated with the landsides is one of the principal criteria for classifying a landslide. In this paper, the modes of instabilities that have been observed in the field are discussed and examples are given. The most widely used methods of analysis of rock slopes such as, limit equilibrium, finite element, discrete element; boundary elements are discussed to highlight their advantages and disadvantages. In this paper, the classification and the methods of analysis are discussed to provide researches as well as engineers with the tools required to analyze and design rock slopes. In complex rock slopes, in civil or mining engineering, hybrid numerical methods must be adapted to better understand the behavior of rock slope. In the case of simple sliding slopes, Limit Equilibrium Techniques can be easily utilized.

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“…Centrifuge modeling is useful for studying prototype behavior in a model scale where the mechanisms involved are mainly governed by gravity induced body forces. Recent work on centrifuge modeling for rock toppling include Adhikary et al [5] who investigated flexural toppling in foliated rock slopes and Zhang et al [6] on the extended Goodman Bray method accommodating nonpersistent basal planes of rock columns.…”

Section: Introductionmentioning

confidence: 99%

Comparisons between centrifuge and numerical modeling results for slope toppling failure

Chen

Gong

et al. 2015

Sci. China Technol. Sci.

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This paper presents series studies on the toppling mechanism by centrifuge tests and numerical simulations. Two different discrete element methods, i.e., the continuum-based discrete element method (CDEM) and the discontinuous deformation analysis (DDA), are adopted. The modeling results show that both the methods can accurately capture the failure modes of the centrifuge tests, including three distinct zones and two failure surfaces. Comparisons are made between the physical test and numerical simulation results. The critical inclination angle of the tilting table where the slope models are fixed on can be moderately predicted by the two methods, with different degrees of precision. The error between the test results and the simulated results is within 1% for the slope models without rock-bridges by both CDEM and DDA. However, it is amplified for the staggered-joint models that simulate the rock-bridges. With DDA, the average error is about 5%, and the maximum error is up to 17%. While with CDEM, the errors for the aligned-joint models are ranged from 1% to 6%, and it is from 10% to 29% for the staggered-joint models. The two numerical methods show the capability in simulating toppling failure of blocky rock mass with and without rock-bridges. The model with rock-bridges which provides a certain bending resistance is more stable than the one without any rock-bridge. In addition, the two failure surfaces were observed, which is different from the common understanding that only one failure surface appears. rock slope model, toppling failure, rock-bridge, centrifuge test, continuum based discrete element method, discontinuous deformation analysis Citation:Chen Z Y, Gong W J, Ma G W, et al. Comparisons between centrifuge and numerical modeling results for slope toppling failure.

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A study of the mechanism of flexural toppling failure of rock slopes

Cited by 210 publications

References 13 publications

Modelagem Numérica Contínua E Equivalente Contínua Para Avaliar Estabilidade De Taludes Suceptíveis a Tombamentos

Modelagem Numérica Contínua E Equivalente Contínua Para Avaliar Estabilidade De Taludes Suceptíveis a Tombamentos

Rock Slopes Processes and Recommended Methods for Analysis

Comparisons between centrifuge and numerical modeling results for slope toppling failure

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