A new excavation analysis method for slope design using discrete fracture network based polyhedral modelling

Elmouttie, Marc; Krahenbuhl, Greg; Soliman, Ahmed

doi:10.1016/j.compgeo.2016.02.014

Cited by 12 publications

(3 citation statements)

References 11 publications

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“…To simulate the influences of fracture on rock slope stability, many novel approaches were proposed, for instance, distinct element method [26,27], numerical manifold method [28], discontinuous deformation analysis [29], hybrid finite discrete method [30], mesh free analysis [31,32]. To integrate fractures into numerical model, these above methods all mainly based on an important conceptual model, discrete fracture network (DFN), which is one of the most popular treatments to deal with stochastic fractures [33][34][35][36][37].…”

Section: Traditional Approaches In Slope Stability Analysismentioning

confidence: 99%

An integrated approach for jointed rock slope stability analysis using stochastic discrete fractures: A case study in mountains area

et al. 2019

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Stochastic discrete fractures are ubiquitous in practicing engineering and contribute much to the stability for geological mediums. In contrast to the traditional treatments based on continuum mechanics, we propose an integrated approach using discrete fractures based on an improved hybrid finite element method (FEM). A typical jointed rock slop is selected as a case study and then was simulated in the light of geological conditions for the study site. The basic equations of fracture domains are derived to generate stochastic discrete fractures which render a fundamental to the model. To implement this procedure through computer program, discrete fractures generating algorithm was developed. In the aspect of discretization, we presented a meshing scheme and proposed an algorithm to create fracture elements. To evaluate rock slope stability in a quantitative way, safety factor is calculated by strength reduction method. Numerical simulations were carried out showing the mechanical behaviors of jointed rock slope under different boundary conditions.

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Section: Traditional Approaches In Slope Stability Analysismentioning

confidence: 99%

An integrated approach for jointed rock slope stability analysis using stochastic discrete fractures: A case study in mountains area

et al. 2019

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“…These discrete fracture models often require extensive knowledge and data of the fracture network to explicitly simulate the fracture [12][13][14]. However, they are too numerically intensive to accurately represent large-scale simulations over long time frames, as required for mine slope stability [15][16][17]. A less numerically intensive approach is offered by effective continuum models.…”

Section: Introductionmentioning

confidence: 99%

Effective Continuum Approximations for Permeability in Brown-Coal and Other Large-Scale Fractured Media

Walsh

2021

Geosciences

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The stability of open-pit brown-coal mines is affected by the manner in which water is transmitted or retained within their slopes. This in turn is a function of the in-situ fracture network at those mines. Fracture networks in real mines exhibit significant degrees of heterogeneity; encompassing a wide range of apertures, inter-fracture separations, and orientations. While each of these factors plays a role in determining fluid movement, over the scale of a mine it is often impractical to precisely measure, let alone simulate, the behaviour of each fracture. Accordingly, effective continuum models capable of representing the bulk effects of the fracture network are needed to understand the movement of fluid within these slopes. This article presents an analysis of the fracture distribution within the slopes of a brown coal mine and outlines a model to capture the effects on the bulk permeability. A stress-dependent effective-fracture-permeability model is introduced that captures the effects of the fracture apertures, spacing, and orientation. We discuss how this model captures the fracture heterogeneity and the effects of changing stress conditions on fluid flow. The fracture network data and the results from the effective permeability model demonstrate that in many cases slope permeability is dominated by highly permeable but low-probability fractures. These results highlight the need for models capable of capturing the effects of heterogeneity and uncertainty on the slope behaviour.

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“…A further benefit of our validation using back-analysis is the opportunity to compare the results (3D and 2D) with other slope stability models. An alternative model that is discussed in this paper was provided by Siromodel (Elmouttie et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Estimation of in situ strength from back-analysis of pit slope failure

Brown¹,

Wood²,

Elmouttie³

2016

Proceedings of the First Asia Pacific Slope Stability in Mining Conference

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Using a software package that can be used for either three or two-dimensional (2D) slope stability analyses of the same model we analyse the stability of columns (3D) or slices (2D) overlying a shear failure surface. The failure surface can be any shape, such as that formed by interconnecting fault surfaces in an open pit slope failure that we analyse. We show that there is a significant difference in the factors of safety calculated using 3D analyses, compared with 2D sections through the same model. This means that different shear strength parameters will apply when the values are varied to obtain a Factor of Safety of 1.0. Systematic back-calculations of open pit slope failures using appropriate 3D analysis methods can give a better understanding of appropriate shear strengths to use in forward 3D analyses. This should lead to more efficient pit slope designs.

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A new excavation analysis method for slope design using discrete fracture network based polyhedral modelling

Cited by 12 publications

References 11 publications

An integrated approach for jointed rock slope stability analysis using stochastic discrete fractures: A case study in mountains area

An integrated approach for jointed rock slope stability analysis using stochastic discrete fractures: A case study in mountains area

Effective Continuum Approximations for Permeability in Brown-Coal and Other Large-Scale Fractured Media

Estimation of in situ strength from back-analysis of pit slope failure

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