Tunnel rockburst with a single set of joints under true-triaxial stress condition
To investigate the influence of different joint conditions on the rockburst of a circular tunnel, a true-triaxial test of rockburst with a single set of joint conditions was conducted. The rockburst incubation and evolution characteristics and acoustic emission evolution characteristics under differ...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-08-01
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| Series: | Journal of Rock Mechanics and Geotechnical Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674775525000198 |
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| Summary: | To investigate the influence of different joint conditions on the rockburst of a circular tunnel, a true-triaxial test of rockburst with a single set of joint conditions was conducted. The rockburst incubation and evolution characteristics and acoustic emission evolution characteristics under different joint directions and joint dip angles were studied. The Weibull function was used to fit rockburst debris with different particle sizes and a single set of joints to obtain statistical results. The experimental results revealed that shear fracture rockburst occurred in samples with joints aligned with the tunnel strike as well as joints with inclination angles of 45°, 60°, and 90°. Slab buckling–shear fracture rockburst was more likely to occur in samples with inclination angles of 0° and 30°. Slab buckling–shear fracture rockburst occurred in samples with joints crossing the tunnel strike as well as in samples with joints with inclination angles of 0°, 30°, 45°, 60°, and 90°. The location of the rockburst pit was influenced by the joint inclination angle when the joints aligned with the tunnel strike. In contrast, when the joints crossed the tunnel strike, the location of the rockburst pit was independent of the joint inclination angle. The cumulative absolute energy of acoustic emission (AE) exhibited an overall upward trend with the increase in joint dip angle. The cumulative absolute energy of the AE of the jointed samples was greater than that of intact samples (without joints). Loading reached the rockburst stage in the samples with joints aligned with the tunnel strike and dip angles of 45°, 60°, and 90°. Moreover, the peak value of AE cumulative absolute energy was the highest. These results can elucidate the evolution mechanism of rockburst in the surrounding rock of circular tunnels with a single set of joints in deep underground engineering. |
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| ISSN: | 1674-7755 |