| Citation: | ZANG Xin，BIAN Huiyuan，ZHANG Yonghao，et al. Mesoscopic failure evolution of mud shale based on CT-PFC coupling method[J]. Bulletin of Geological Science and Technology，2025，44（6）：1-11 doi: 10.19509/j.cnki.dzkq.tb20230724
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To investigate the failure mechanism of rocks at the mesoscopic scale,
This study proposes a novel modeling method that combines digital image processing (DIP) technology and particle flow code (PFC) to characterize mineral properties. The discrete element numerical model was calibrated using macroscopic mechanical parameters and failure modes obtained from conventional triaxial compression tests. Under geostress conditions, the influence of rock mineral properties on rock failure evolution and the effect of heterogeneous structures on microcracking behavior were analyzed.
The results show that the loading process of conventional triaxial compression tests can be divided into four stages: Crack closing stage, elastic deformation stage, crack growth stage, and crack explosion stage. Simulations based on computed tomography (CT) slices of three shale samples indicate that rock heterogeneity has a certain impact on the generation of rock microcracks and rock physical-mechanical parameters—weaker heterogeneity corresponds to higher peak strength (
The research findings provide important reference significance for deep underground oil and gas exploitation and disaster prevention engineering.
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