The Experts below are selected from a list of 6828 Experts worldwide ranked by ideXlab platform
Marc Elmouttie - One of the best experts on this subject based on the ideXlab platform.
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Rock Slope Stability analysis using photogrammetric data and DFN-DEM modelling
Acta Geotechnica, 2015Co-Authors: Viviana Bonilla-sierra, Luc Scholtès, Frederic Donze, Marc ElmouttieAbstract:Structural and mechanical analyses of Rock mass are key components for Rock Slope Stability assessment. The complementary use of photogrammetric techniques and numerical models coupling discrete fracture networks with the discrete element method (DEM) provides a methodology that can be applied to assess the mechanical behaviour of realistic three-dimensional (3D) configurations for which fracture persistence cannot be assumed. A real case has been studied to show the complete methodology from the acquisition of the photogrammetric data to the numerical modelling of the potential progressive failure process occurring in the Rock mass. Using a 3D mapping system and its associated structural mapping tool Sirovision, the topography and the discontinuity set of an unstable Rock block located in a limestone layer of the Mount N,ron, located in the French Alps, were imported into a DEM code specially enhanced for the modelling of pre-fractured Rock masses. A Stability analysis has been carried out, emphasizing the contribution of Rock bridge failure through a mixed shear-tensile failure process to the generation of new failure surfaces. This addresses limitations in methodologies using only shear strength reduction method. It is believed that the proposed methodology can strengthen the basis for a more comprehensive Stability analysis of complex fractured Rock Slopes.
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Rock Slope Stability analysis using photogrammetric data and DFN–DEM modelling
Acta Geotechnica, 2015Co-Authors: Viviana Bonilla-sierra, Luc Scholtès, Frederic Donze, Marc ElmouttieAbstract:Structural and mechanical analyses of Rock mass are key components for Rock Slope Stability assessment. The complementary use of photogrammetric techniques and numerical models coupling discrete fracture networks with the discrete element method (DEM) provides a methodology that can be applied to assess the mechanical behaviour of realistic three-dimensional (3D) configurations for which fracture persistence cannot be assumed. A real case has been studied to show the complete methodology from the acquisition of the photogrammetric data to the numerical modelling of the potential progressive failure process occurring in the Rock mass. Using a 3D mapping system and its associated structural mapping tool Sirovision, the topography and the discontinuity set of an unstable Rock block located in a limestone layer of the Mount Néron, located in the French Alps, were imported into a DEM code specially enhanced for the modelling of pre-fractured Rock masses. A Stability analysis has been carried out, emphasizing the contribution of Rock bridge failure through a mixed shear-tensile failure process to the generation of new failure surfaces. This addresses limitations in methodologies using only shear strength reduction method. It is believed that the proposed methodology can strengthen the basis for a more comprehensive Stability analysis of complex fractured Rock Slopes.
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Coupling photogrammetric data with DFN-DEM model for Rock Slope Stability assessment
2013Co-Authors: Viviana Bonilla-sierra, Luc Scholtès, Frederic Donze, Marc Elmouttie, Julien LorentzAbstract:• Structural and mechanical analyses of Rock masses are key components for Rock Slope Stability assessment. • Photogrammetric techniques [Poropat, 2001] and coupled DFN-DEM models [Harthong et al., 2012] provide a methodology that can be applied to analyse complex 3D configurations. • DFN-DEM formulation [Scholtes & Donze, 2012a,b] has been chosen for modeling unstable Rock Slopes, since it takes into account the sets of discontinuities. • Fracture persistency is not assumed, allowing the possibility to analyse the contribution of Rock bridges on the failure surface development. • A modeling methodology to assess the Stability of a potentially unstable Rock Slope is presented.
Hani S Mitri - One of the best experts on this subject based on the ideXlab platform.
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application of Rock mass classification systems to Rock Slope Stability assessment a case study
Journal of rock mechanics and geotechnical engineering, 2017Co-Authors: Hassan Basahel, Hani S MitriAbstract:Abstract The Stability of Rock Slopes is considered crucial to public safety in highways passing through Rock cuts, as well as to personnel and equipment safety in open pit mines. Slope inStability and failures occur due to many factors such as adverse Slope geometries, geological discontinuities, weak or weathered Slope materials as well as severe weather conditions. External loads like heavy precipitation and seismicity could play a significant role in Slope failure. In this paper, several Rock mass classification systems developed for Rock Slope Stability assessment are evaluated against known Rock Slope conditions in a region of Saudi Arabia, where Slopes located in rugged terrains with complex geometry serve as highway road cuts. Selected empirical methods have been applied to 22 Rock cuts that are selected based on their failure mechanisms and Slope materials. The Stability conditions are identified, and the results of each Rock Slope classification system are compared. The paper also highlights the limitations of the empirical classification methods used in the study and proposes future research directions.
Viviana Bonilla-sierra - One of the best experts on this subject based on the ideXlab platform.
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The use of photogrammetry and 3D discrete element models to better assess Rock Slope Stability
2015Co-Authors: Viviana Bonilla-sierraAbstract:Structural and mechanical analyses of Rock mass are key components for Rock Slope Stability assessment. The complementary use of photogrammetric techniques and numerical models coupling discrete fracture networks (DFN) with the discrete element method (DEM) provides a methodology that can be applied to assess the mechanical behaviour of realistic three-dimensional (3D) configurations for which fracture persistence cannot be assumed. The Stability of the Rock mass is generally assumed to be controlled by the shear strength along discontinuity planes present within the Slope. If the discontinuities are non–persistent with their continuity being interrupted by the presence of intact Rock bridges, their apparent strength increases considerably. In this case, the contribution of the Rock bridges located in-between these discontinuities have to be accounted for in the Stability analysis. The progressive failure of Rock Slope involving non–persistent discontinuities can be numerically investigated based upon simulations performed using a DEM approach. The intact material is represented as an assembly of bonded particles interacting through dedicated contact laws that can be calibrated to properly represent the behaviour of the Rock material. The advantage of the method is that it enables to simulate fracture initiation and propagation inside the Rock matrix as a result of inter-particle bond breakage. In addition, pre–existing discontinuities can be explicitly included in the model by using a modified contact logic that ensures an explicit and constitutive mechanical behaviour of the discontinuity planes. Stability analyses were carried out with emphasis on the contribution of Rock bridges failure through a mixed shear-tensile failure process, leading to the generation of new failure surfaces. Jennings' formulation being considered to be one of the first Rock Slope Stability analysis that evaluates the resistance to sliding as a weighted combination of both, intact Rock bridges and discontinuity planes strengths, its validity was discussed and systematically compared to results obtained from numerical simulations. We demonstrate that the validity of Jennings' formulation is limited as soon as tensile failure becomes predominant and an alternative formulation is proposed to assess the resulting equivalent strength. Regarding field Slope Stability, we show that the combination of high resolution photogrammetric data and DFN-DEM modelling can be used to identify valid model scenarios of unstable wedges and blocks daylighting at the surface of both natural and engineered Rock Slopes. Back analysis of a real case study confirmed that failure surfaces can be simulated as a result of both fracture propagation across Rock bridges and sliding along pre-existing discontinuities. An identified wedge failure that occurred in an Australian coal mine was used to validate the methodology. Numerical simulations were undertaken to determine in what scenarios the measured and predicted failure surfaces can be used to calibrate strength parameters in the model. The work presented here is part of a more global need to improve natural and mining hazards management related to unstable Rock masses. We believe that the proposed methodology can strengthen the basis for a more comprehensive Stability analysis of complex fractured Rock Slopes.
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Rock Slope Stability analysis using photogrammetric data and DFN-DEM modelling
Acta Geotechnica, 2015Co-Authors: Viviana Bonilla-sierra, Luc Scholtès, Frederic Donze, Marc ElmouttieAbstract:Structural and mechanical analyses of Rock mass are key components for Rock Slope Stability assessment. The complementary use of photogrammetric techniques and numerical models coupling discrete fracture networks with the discrete element method (DEM) provides a methodology that can be applied to assess the mechanical behaviour of realistic three-dimensional (3D) configurations for which fracture persistence cannot be assumed. A real case has been studied to show the complete methodology from the acquisition of the photogrammetric data to the numerical modelling of the potential progressive failure process occurring in the Rock mass. Using a 3D mapping system and its associated structural mapping tool Sirovision, the topography and the discontinuity set of an unstable Rock block located in a limestone layer of the Mount N,ron, located in the French Alps, were imported into a DEM code specially enhanced for the modelling of pre-fractured Rock masses. A Stability analysis has been carried out, emphasizing the contribution of Rock bridge failure through a mixed shear-tensile failure process to the generation of new failure surfaces. This addresses limitations in methodologies using only shear strength reduction method. It is believed that the proposed methodology can strengthen the basis for a more comprehensive Stability analysis of complex fractured Rock Slopes.
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Rock Slope Stability analysis using photogrammetric data and DFN–DEM modelling
Acta Geotechnica, 2015Co-Authors: Viviana Bonilla-sierra, Luc Scholtès, Frederic Donze, Marc ElmouttieAbstract:Structural and mechanical analyses of Rock mass are key components for Rock Slope Stability assessment. The complementary use of photogrammetric techniques and numerical models coupling discrete fracture networks with the discrete element method (DEM) provides a methodology that can be applied to assess the mechanical behaviour of realistic three-dimensional (3D) configurations for which fracture persistence cannot be assumed. A real case has been studied to show the complete methodology from the acquisition of the photogrammetric data to the numerical modelling of the potential progressive failure process occurring in the Rock mass. Using a 3D mapping system and its associated structural mapping tool Sirovision, the topography and the discontinuity set of an unstable Rock block located in a limestone layer of the Mount Néron, located in the French Alps, were imported into a DEM code specially enhanced for the modelling of pre-fractured Rock masses. A Stability analysis has been carried out, emphasizing the contribution of Rock bridge failure through a mixed shear-tensile failure process to the generation of new failure surfaces. This addresses limitations in methodologies using only shear strength reduction method. It is believed that the proposed methodology can strengthen the basis for a more comprehensive Stability analysis of complex fractured Rock Slopes.
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Coupling photogrammetric data with DFN-DEM model for Rock Slope Stability assessment
2013Co-Authors: Viviana Bonilla-sierra, Luc Scholtès, Frederic Donze, Marc Elmouttie, Julien LorentzAbstract:• Structural and mechanical analyses of Rock masses are key components for Rock Slope Stability assessment. • Photogrammetric techniques [Poropat, 2001] and coupled DFN-DEM models [Harthong et al., 2012] provide a methodology that can be applied to analyse complex 3D configurations. • DFN-DEM formulation [Scholtes & Donze, 2012a,b] has been chosen for modeling unstable Rock Slopes, since it takes into account the sets of discontinuities. • Fracture persistency is not assumed, allowing the possibility to analyse the contribution of Rock bridges on the failure surface development. • A modeling methodology to assess the Stability of a potentially unstable Rock Slope is presented.
Hassan Basahel - One of the best experts on this subject based on the ideXlab platform.
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application of Rock mass classification systems to Rock Slope Stability assessment a case study
Journal of rock mechanics and geotechnical engineering, 2017Co-Authors: Hassan Basahel, Hani S MitriAbstract:Abstract The Stability of Rock Slopes is considered crucial to public safety in highways passing through Rock cuts, as well as to personnel and equipment safety in open pit mines. Slope inStability and failures occur due to many factors such as adverse Slope geometries, geological discontinuities, weak or weathered Slope materials as well as severe weather conditions. External loads like heavy precipitation and seismicity could play a significant role in Slope failure. In this paper, several Rock mass classification systems developed for Rock Slope Stability assessment are evaluated against known Rock Slope conditions in a region of Saudi Arabia, where Slopes located in rugged terrains with complex geometry serve as highway road cuts. Selected empirical methods have been applied to 22 Rock cuts that are selected based on their failure mechanisms and Slope materials. The Stability conditions are identified, and the results of each Rock Slope classification system are compared. The paper also highlights the limitations of the empirical classification methods used in the study and proposes future research directions.
Frederic Donze - One of the best experts on this subject based on the ideXlab platform.
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Rock Slope Stability analysis using photogrammetric data and DFN-DEM modelling
Acta Geotechnica, 2015Co-Authors: Viviana Bonilla-sierra, Luc Scholtès, Frederic Donze, Marc ElmouttieAbstract:Structural and mechanical analyses of Rock mass are key components for Rock Slope Stability assessment. The complementary use of photogrammetric techniques and numerical models coupling discrete fracture networks with the discrete element method (DEM) provides a methodology that can be applied to assess the mechanical behaviour of realistic three-dimensional (3D) configurations for which fracture persistence cannot be assumed. A real case has been studied to show the complete methodology from the acquisition of the photogrammetric data to the numerical modelling of the potential progressive failure process occurring in the Rock mass. Using a 3D mapping system and its associated structural mapping tool Sirovision, the topography and the discontinuity set of an unstable Rock block located in a limestone layer of the Mount N,ron, located in the French Alps, were imported into a DEM code specially enhanced for the modelling of pre-fractured Rock masses. A Stability analysis has been carried out, emphasizing the contribution of Rock bridge failure through a mixed shear-tensile failure process to the generation of new failure surfaces. This addresses limitations in methodologies using only shear strength reduction method. It is believed that the proposed methodology can strengthen the basis for a more comprehensive Stability analysis of complex fractured Rock Slopes.
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Rock Slope Stability analysis using photogrammetric data and DFN–DEM modelling
Acta Geotechnica, 2015Co-Authors: Viviana Bonilla-sierra, Luc Scholtès, Frederic Donze, Marc ElmouttieAbstract:Structural and mechanical analyses of Rock mass are key components for Rock Slope Stability assessment. The complementary use of photogrammetric techniques and numerical models coupling discrete fracture networks with the discrete element method (DEM) provides a methodology that can be applied to assess the mechanical behaviour of realistic three-dimensional (3D) configurations for which fracture persistence cannot be assumed. A real case has been studied to show the complete methodology from the acquisition of the photogrammetric data to the numerical modelling of the potential progressive failure process occurring in the Rock mass. Using a 3D mapping system and its associated structural mapping tool Sirovision, the topography and the discontinuity set of an unstable Rock block located in a limestone layer of the Mount Néron, located in the French Alps, were imported into a DEM code specially enhanced for the modelling of pre-fractured Rock masses. A Stability analysis has been carried out, emphasizing the contribution of Rock bridge failure through a mixed shear-tensile failure process to the generation of new failure surfaces. This addresses limitations in methodologies using only shear strength reduction method. It is believed that the proposed methodology can strengthen the basis for a more comprehensive Stability analysis of complex fractured Rock Slopes.
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Coupling photogrammetric data with DFN-DEM model for Rock Slope Stability assessment
2013Co-Authors: Viviana Bonilla-sierra, Luc Scholtès, Frederic Donze, Marc Elmouttie, Julien LorentzAbstract:• Structural and mechanical analyses of Rock masses are key components for Rock Slope Stability assessment. • Photogrammetric techniques [Poropat, 2001] and coupled DFN-DEM models [Harthong et al., 2012] provide a methodology that can be applied to analyse complex 3D configurations. • DFN-DEM formulation [Scholtes & Donze, 2012a,b] has been chosen for modeling unstable Rock Slopes, since it takes into account the sets of discontinuities. • Fracture persistency is not assumed, allowing the possibility to analyse the contribution of Rock bridges on the failure surface development. • A modeling methodology to assess the Stability of a potentially unstable Rock Slope is presented.
