Fracture damage and energy dissipation of granite based on continuous-discontinuous coupling
Run-Zhi Jia, Hong-Jie Duan, Meng-Zhen Su, Xiao-Zhi Liu, Yun-Juan Chen
TL;DR
This paper studies how granite fractures and dissipates energy under different pressures using a simulation model that matches lab results.
Contribution
A novel continuous-discontinuous coupling model is used to analyze granite fracture behavior and energy patterns under varying confining pressures.
Findings
Internal cracks form and propagate rapidly around weak particles at 65% of granite's peak strength.
Confining pressure reduces tensile cracks and increases shear cracks, shifting failure from brittle to plastic.
Energy accumulation dominates before peak strength, followed by dissipation and release after the peak.
Abstract
A three-dimensional continuous-discontinuous numerical model was established through FLAC3D-PFC3D simulation coupling to study the fracture damage and energy dissipation characteristics of granite under varying confining pressures, based on X-ray diffraction and laboratory mechanical tests. The results demonstrated strong agreement between the simulation outcomes of the coupling model and the laboratory experiments, particularly concerning mineral composition. At approximately 65% of the peak strength of granite, internal cracks emerged and propagated rapidly around particles with weaker strength, resulting in the formation of primary “X” type cracks that diagonally penetrated the rock sample, accompanied by secondary tensile cracks. As the confining pressure increased, the ratio of tensile cracks in rock sample failure decreased, while the ratio of shear cracks increased. This…
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Taxonomy
TopicsRock Mechanics and Modeling · Landslides and related hazards · Geophysical Methods and Applications