首页|Crack interaction and fracturing of geomaterials with multiscale cracks
Crack interaction and fracturing of geomaterials with multiscale cracks
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NSTL
Elsevier
? 2022 Elsevier LtdGeomaterials contain numerous cracks whose interaction affects the macroscopic mechanical properties of the materials significantly. We propose a mechanical model of cracks of 3 scale levels to investigate the pattern of crack propagation and possible failure modes produced. For modelling crack interaction between different scale levels, we model the unloading domain of influence of a single crack as the sphere with the diameter being the crack size drawn around the crack center. When the tip of a lower scale crack propagates into the influence domain of a crack of a higher scale level, the propagating crack of a lower scale will be unloaded and never grow from this tip. Propagation and coalescence of cracks of different scale levels for different initial crack concentration result in different patterns of cracks propagation and failure. For relatively lower initial crack concentrations, the interaction of cracks of the first scale level dominates, producing failure due to the coalescence of cracks of the first scale level. With the increase of the initial crack concentration, the coalescence of cracks of the third scale level dominates leading to failure at a higher initial concentration. With the further increase of the initial crack concentration, the failure is produced by the coalescence of cracks of the second scale level. At even higher initial crack concentrations the failure is again produced by the coalescence of cracks of the first scale level. The dynamic strength decreases with the increase in the initial crack concentration.
Beijing Advanced Innovation Center for Future Urban Design Beijing International Cooperation Base for Transportation Infrastructure Construction Beijing University of Civil Engineering and Architecture
Department of Civil Environmental and Mining Engineering The University of Western Australia
Department of Mechanical Engineering The University of Western Australia
NSTL
Elsevier
