Integrated multivariate digital representation model for rock microstructure

Abstract

Unravelling the intricate relationships between mineralogy, defects, and other microstructural features during the rock fracturing process is challenging due to the inherent invisibility of rocks. In this study, we propose a novel integrated multivariate digital representation model that discretizes the rock into differential elements and applies the Matter-Element Theory to represent the microstructure. This model successfully captures the complexity and diversity of rock microstructural properties, enabling transparency of the internal rock structure. CT scanning, mechanical loading, and rock-mineral identification experiments were performed on rock samples to validate the model. Microstructural data, including pores, fractures, and minerals at different stages of failure, were obtained and integrated into the model. The results show that the integrated digital model is an accurate representation of the distribution states of internal microstructural features within rocks. The influence of microstructural features on rock fracture was investigated by extracting microstructural data corresponding to specific fracture evolution by comparing the model output with actual rock fracture results. This research provides a theoretical basis for the extraction of universal laws and characteristics, facilitating the comprehensive investigation of diverse microstructural features. In addition, it will enable the dynamic assessment of rock fracture and the early warning of rock hazards in engineering applications.