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Experimental study of crack evolution in prefabricated double-fissure red sandstone based on acoustic emission location

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Abstract

The development of micro-cracks during damage to rocks affects the propagation of macroscopic cracks on the surface. To explore the crack evolution among pre-existing flaws in rocks, based on the acoustic emission (AE) source location results, the paper analysed the influences of micro-crack development on failure mode. By analyzing AE characteristic parameters, the main controlling factors affecting the development of micro-fractures are determined. The results show that: (1) the development of micro-cracks in rock samples presents a trend of having a high-energy fracture point, the low-energy and small fracture region, the extensive fracture region, and a macroscopic fracture zone. (2) The difference in rock failure mode arises from the influence of rock bridge on the number, location, and extension direction of high-energy fractures, which results in the difference in the formation of main damage zone in rock samples. (3) The total number of micro-cracks, the proportion of shear cracks, and mixed-mode cracks gradually increase with the increase of the rock bridge inclination angle, leading to the gradual evolution of rock samples from simple tensile failure mode to complex crack penetration mode. The variation of the rock bridge inclination angle affects the stress direction of the rock particles at a microscopic level, while it affects the direction of macroscopic crack propagation at a macroscopic level.

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source location; a, b, c, d, e, f and g represent samples of C-1, C0-1, C30-1, C60-1, C90-1, C120-1 and C150-1, respectively; h Legend: AE sources

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Acknowledgement

This research was supported by National Natural Science Foundation of China (42077231), the Natural Science Foundation of Zhejiang Province (LQ20E040002) and Research projects of Shaoxing University in 2018 (2018LG1004).

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Correspondence to Sheng-Qi Yang.

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Yang, J., Yang, SQ., Liu, GJ. et al. Experimental study of crack evolution in prefabricated double-fissure red sandstone based on acoustic emission location. Geomech. Geophys. Geo-energ. Geo-resour. 7, 18 (2021). https://doi.org/10.1007/s40948-021-00219-8

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