This paper proposes a numerical three-dimensional(3d)mesoscopic approach based on the discreteelement method combined with X-ray computed tomography(XCT)images to characterize the dynamic impact behavior of heterogen...
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This paper proposes a numerical three-dimensional(3d)mesoscopic approach based on the discreteelement method combined with X-ray computed tomography(XCT)images to characterize the dynamic impact behavior of heterogeneous coal-rock(HCR).The dynamic impact loading in three directions was modelled to investigate the effects of the 3d meso-structure on the failure patterns and fracture mechanism,with different impact *** XCT image-baseddiscreteelement model of HCR was calibrated through appropriate standard uniaxial compression *** simulations were carried out to investigate how the breakage behaviors are affected by different loading directions with different impact *** loading direction,input energy,and spatial distribution of the mineral phase had a remarkable influence on the failure patterns and load-carrying *** shape of the gangue phase and the approximate location of the gangue interfaces are key parameters to consider when investigating the failure patterns and fracture mechanism of heterogeneous rock *** damage and fracture tended to propagate from the surfaces to the HCR *** gangue phase area contacting the loading wall,growth direction of the strong gangue interfaces,and loading directions greatly influenced the failure patterns of the heterogeneous rock materials.
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