Experimental study examines mechanical properties and fracture evolution in multifractured sandstone, suggesting fracture analysis may hinge on inclination angles.
The presence of internal cracks in rocks within underground engineering environments has significantly compromised their stability, and groundwater has substantially influenced the mechanical properties and fracture evolution of rock masses. In this study, sandstone specimens containing three parallel cracks under saturated water conditions were investigated. Using uniaxial compression tests and digital image correlation (DIC) technology, the influence of the inclination angles of the three parallel cracks on the mechanical properties and fracture evolution of rocks under saturated water conditions was examined. The experimental results showed that under saturated water conditions, the peak stress of the specimens first decreased and then increased with increasing crack inclination angle. Results from digital image correlation (DIC) technology indicate that the strain field evolution provided a reliable basis for predicting crack propagation. Strain localization bands first developed at the tips of the prefabricated cracks, and a similar pattern is observed for crack initiation. Monitoring changes in the maximum principal strain at the tips of the prefabricated cracks revealed that the maximum principal strain curve exhibited sharp increase or decrease coinciding with crack formation in the specimens. This phenomenon served as an early warning indicator for rock failure.
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Yang et al. (2025) studied this question.
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