The Experts below are selected from a list of 22737 Experts worldwide ranked by ideXlab platform

Marc Elmouttie - One of the best experts on this subject based on the ideXlab platform.

  • Rock slope stability analysis using photogrammetric data and DFN–DEM modelling
    Acta Geotechnica, 2015
    Co-Authors: Viviana Bonilla-sierra, Luc Scholtès, Frederic Donze, Marc Elmouttie
    Abstract:

    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.

  • Rock slope stability analysis using photogrammetric data and DFN-DEM modelling
    Acta Geotechnica, 2015
    Co-Authors: Viviana Bonilla-sierra, Luc Scholtès, Frederic Donze, Marc Elmouttie
    Abstract:

    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.

Viviana Bonilla-sierra - One of the best experts on this subject based on the ideXlab platform.

  • Rock slope stability analysis using photogrammetric data and DFN–DEM modelling
    Acta Geotechnica, 2015
    Co-Authors: Viviana Bonilla-sierra, Luc Scholtès, Frederic Donze, Marc Elmouttie
    Abstract:

    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.

  • Rock slope stability analysis using photogrammetric data and DFN-DEM modelling
    Acta Geotechnica, 2015
    Co-Authors: Viviana Bonilla-sierra, Luc Scholtès, Frederic Donze, Marc Elmouttie
    Abstract:

    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.

Frederic Donze - One of the best experts on this subject based on the ideXlab platform.

  • Rock slope stability analysis using photogrammetric data and DFN–DEM modelling
    Acta Geotechnica, 2015
    Co-Authors: Viviana Bonilla-sierra, Luc Scholtès, Frederic Donze, Marc Elmouttie
    Abstract:

    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.

  • Rock slope stability analysis using photogrammetric data and DFN-DEM modelling
    Acta Geotechnica, 2015
    Co-Authors: Viviana Bonilla-sierra, Luc Scholtès, Frederic Donze, Marc Elmouttie
    Abstract:

    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.

Luc Scholtès - One of the best experts on this subject based on the ideXlab platform.

  • Rock slope stability analysis using photogrammetric data and DFN–DEM modelling
    Acta Geotechnica, 2015
    Co-Authors: Viviana Bonilla-sierra, Luc Scholtès, Frederic Donze, Marc Elmouttie
    Abstract:

    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.

  • Rock slope stability analysis using photogrammetric data and DFN-DEM modelling
    Acta Geotechnica, 2015
    Co-Authors: Viviana Bonilla-sierra, Luc Scholtès, Frederic Donze, Marc Elmouttie
    Abstract:

    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.

Fujin Deng - One of the best experts on this subject based on the ideXlab platform.

  • Fault-tolerant compensation control for T-type three-level inverter with zero-sequence voltage injection
    IET Power Electronics, 2019
    Co-Authors: Jianzhong Zhang, Fujin Deng
    Abstract:

    This study proposes a carrier-based PWM strategy with zero-sequence voltage injection for T-type three-level inverter to a tolerant open-circuit fault. The half-Bridge and NP Bridge open-circuit faults are analysed. The faulty switch can be identified by the average phase current and the deviation of neutral-point (NP) voltage. In the case of half-Bridge Failure, the fault-tolerant control reduces the distortion of phase current and the amplitude of line-to-line voltage is decreased. In the case of NP Failure, the faulty pole voltage becomes two-level instead of three-level and the phase voltage is not reduced. By using the novel zero-sequence voltage injection, the NP voltage is balanced in both half-Bridge and NP Bridge Failures, which do not require additional hardware and complex calculations. The effectiveness of the proposed fault-tolerant PWM strategy and injection of zero-sequence voltage is validated by the simulation and experiment results.

  • Fault‐tolerant compensation control for T‐type three‐level inverter with zero‐sequence voltage injection
    IET Power Electronics, 2019
    Co-Authors: Jianzhong Zhang, Fujin Deng
    Abstract:

    This study proposes a carrier-based PWM strategy with zero-sequence voltage injection for T-type three-level inverter to a tolerant open-circuit fault. The half-Bridge and NP Bridge open-circuit faults are analysed. The faulty switch can be identified by the average phase current and the deviation of neutral-point (NP) voltage. In the case of half-Bridge Failure, the fault-tolerant control reduces the distortion of phase current and the amplitude of line-to-line voltage is decreased. In the case of NP Failure, the faulty pole voltage becomes two-level instead of three-level and the phase voltage is not reduced. By using the novel zero-sequence voltage injection, the NP voltage is balanced in both half-Bridge and NP Bridge Failures, which do not require additional hardware and complex calculations. The effectiveness of the proposed fault-tolerant PWM strategy and injection of zero-sequence voltage is validated by the simulation and experiment results.