Experimental Study on Characteristic Stresses and Deformation Damage Evolution in Pore-Bearing Granite Specimens
Based on the acoustic emission monitoring system and the XTDIC 3D full-field strain measurement system, uniaxial compression experiments of granite specimens with holes were studied to determine the influence of the number of holes on the characteristic stresses and deformation and damage laws of gr...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2025-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/adce/5542859 |
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| Summary: | Based on the acoustic emission monitoring system and the XTDIC 3D full-field strain measurement system, uniaxial compression experiments of granite specimens with holes were studied to determine the influence of the number of holes on the characteristic stresses and deformation and damage laws of granite specimens. An increased number of holes produces stress concentration, generating and expanding cracks. Crack initiation stress and damage stress gradually decrease. Compared with the single-hole specimens, the average crack initiation stress and damage stress of two-hole specimens are reduced by 31.54% and 19.18%, respectively. Three-hole specimens’ average crack initiation and damage stress are reduced by 48.85% and 33.8%, respectively. The increased number of holes contributes to forming a deformation localisation zone around the holes, gradually increasing the peak value of the displacement dislocation momentum. In addition, compared with the single-hole specimen with only one main control crack, the two-hole specimen has a more intense degree of damage and contains more newborn cracks. In contrast, the three-hole specimen has a much lower bearing capacity at the rock bridge than in other locations and is easier to penetrate. Hence, cracks are most likely to expand and penetrate quickly, directly leading to damage. Therefor, the degree of damage is reduced compared with the double-hole specimen and only contains one main control crack. The research results have theoretical value in filling the gap of the influence of hole number on the mechanical properties of granite and have engineering significance in ensuring the stability of underground engineering. |
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| ISSN: | 1687-8094 |