Study on mechanical properties and failure behavior of jointed gypsum rock under uniaxial compression using AE and DIC techniques
To explore the mechanical characteristics and progressive failure characteristics of jointed gypsum rock under quasi-static loading, uniaxial compression tests were carried out on gypsum rocks with various joint angles. Using acoustic emission (AE) and digital image correlation (DIC) techniques, the...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-09-01
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| Series: | Results in Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123025020961 |
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| Summary: | To explore the mechanical characteristics and progressive failure characteristics of jointed gypsum rock under quasi-static loading, uniaxial compression tests were carried out on gypsum rocks with various joint angles. Using acoustic emission (AE) and digital image correlation (DIC) techniques, the effects of joints on gypsum rock failure and instability was analyzed in terms of mechanical strength characteristics, failure behavior, AE characteristics, and deformation evolution. The results show that under the uniaxial compression, the peak strength and elastic modulus of jointed gypsum rock initially decrease and then increase as the joint angle increases, reaching their lowest values at joint angles of 45° or 60°. The failure mode of the specimen is primarily a composite of tension and shear failure along the joint surface. Based on the characteristic stress values from the progressive failure process of jointed gypsum rock, quadratic relationships between the initiation stress, damage stress, peak stress, and joint angle were established. The sensitivity of each strength characteristic to changes in joint angle was also analyzed. Furthermore, the patterns of AE characteristics during the fracture process of jointed gypsum rocks were analyzed, including the effects of joint angle on the AE cumulative count rate, cumulative energy rate, and peak energy rate. Additionally, the failure precursor characteristics of gypsum rocks with different joint angles were explored. Finally, DIC technology was used to investigate crack propagation and strain evolution in jointed gypsum rock throughout the stages of progressive failure, and to visualize crack evolution during the instability failure process. These findings provide theoretical support for disaster prevention and the comprehensive utilization of underground gypsum mine goafs. |
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| ISSN: | 2590-1230 |