Abstract
In the study of rock mechanics, the variation of rock mechanical characteristics in high-temperature environments is always a major issue. The discrete element method and Voronoi modeling method were used to study the mechanical characteristics and crack evolution of granite specimens subjected to the high temperature and uniaxial compression test in order to study the internal crack evolution process of granite under the influence of high temperatures. Meanwhile, dependable findings were acquired when compared to experimental outcomes. A modified failure criterion was devised, and a Fish function was built to examine the evolution behavior of tensile and shear cracks during uniaxial compression, in order to better understand the evolution process of micro-cracks in granite specimens. Shear contacts occurred first, and the number of shear cracks reached its maximum value earliest, according to the findings. The number of tensile contacts then rapidly grew, whereas the number of shear cracks steadily declined. Furthermore, it was found that when temperature rises, the number of early tensile cracks grows. This study develops a fracture prediction system for rock engineering in high-temperature conditions.
Highlights
Deterioration of the mechanical properties of crystalline rocks due to temperature variations is always a problem in the field of rock mechanics, as thermal attack induces new microcracks or enlarges existing microcracks
Gao et al (2016) simulated the microstructure of rock-like materials using grain-based method (GBM) in UDEC [22]. Their results show that the influence of shear cracking dominates over tensile cracking under axial compression at the unconfined compressive strength (UCS), which agrees with the results reported [1]
These mechanical parameters were taken from laboratory uniaxial compression and triaxial compression tests
Summary
Deterioration of the mechanical properties of crystalline rocks due to temperature variations is always a problem in the field of rock mechanics, as thermal attack induces new microcracks or enlarges existing microcracks. Along with the experimental investigations of the mechanical properties of rocks, extensive numerical studies have been conducted to simulate rock behaviour. Simulated a biaxial compression test using the bonded particle model (BPM) within the particle flow code (PFC2D) [15] Their results showed that there are three main stages of micro-crack development: the initial stable development stage, the rapid increase stage, and the final stable development stage. Gao et al (2016) simulated the microstructure of rock-like materials using GBM in UDEC [22] Their results show that the influence of shear cracking dominates over tensile cracking under axial compression at the UCS, which agrees with the results reported [1]. The result provides a significant method and effective parameters for rock engineering subjected to high temperatures
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