Evaluation of the propensity of strain burst in brittle granite based on post-peak energy analysis
The increasing demand for resources and depletion of near ground mineral resources caused deeper mining operations under high-stress rock mass conditions. As a result of this, strain burst, which is the sudden release of stored strain energy in the surrounding rock mass, has become more prevalent an...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2021-02-01
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| Series: | Underground Space |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2467967418301569 |
| _version_ | 1797727446970138624 |
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| author | Selahattin Akdag Murat Karakus Giang D. Nguyen Abbas Taheri Thomas Bruning |
| author_facet | Selahattin Akdag Murat Karakus Giang D. Nguyen Abbas Taheri Thomas Bruning |
| author_sort | Selahattin Akdag |
| collection | DOAJ |
| description | The increasing demand for resources and depletion of near ground mineral resources caused deeper mining operations under high-stress rock mass conditions. As a result of this, strain burst, which is the sudden release of stored strain energy in the surrounding rock mass, has become more prevalent and created a considerable threat to workers and construction equipment. It is, therefore, imperative to understand how strain burst mechanism and stored excess strain energy are affected due to the high confinement in deep underground conditions. For this purpose, post-peak energy distributions for brittle rocks were investigated using a newly developed energy calculation method associated with acoustic emission (AE). A series of quasi-static uniaxial and triaxial compression tests controlled by the circumferential expansion were conducted. Snap-back behaviour known as Class-II behaviour associated with energy evolution and the material response under self-sustaining failure were analysed on granites under a wide range of confining pressures (0–60 MPa). The experimental results underline that the energy evolution characteristics are strongly linked to confinement. Stored elastic strain energy (dUE), energy consumed by dominating cohesion weakening (dΦCW) and energy dissipated during mobilisation of frictional failure (dΦFM) showed a rising trend as the confining pressure was increased. An intrinsic ejection velocity was proposed to express the propensity of strain burst that was purely determined by the excess strain energy released from Class II rock. |
| first_indexed | 2024-03-12T10:59:52Z |
| format | Article |
| id | doaj.art-b869655fc81c4adca5bde671793590c6 |
| institution | Directory Open Access Journal |
| issn | 2467-9674 |
| language | English |
| last_indexed | 2024-03-12T10:59:52Z |
| publishDate | 2021-02-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Underground Space |
| spelling | doaj.art-b869655fc81c4adca5bde671793590c62023-09-02T05:53:33ZengKeAi Communications Co., Ltd.Underground Space2467-96742021-02-0161111Evaluation of the propensity of strain burst in brittle granite based on post-peak energy analysisSelahattin Akdag0Murat Karakus1Giang D. Nguyen2Abbas Taheri3Thomas Bruning4School of Civil, Environmental and Mining Engineering, The University of Adelaide, Adelaide, SA, AustraliaCorresponding author.; School of Civil, Environmental and Mining Engineering, The University of Adelaide, Adelaide, SA, AustraliaSchool of Civil, Environmental and Mining Engineering, The University of Adelaide, Adelaide, SA, AustraliaSchool of Civil, Environmental and Mining Engineering, The University of Adelaide, Adelaide, SA, AustraliaSchool of Civil, Environmental and Mining Engineering, The University of Adelaide, Adelaide, SA, AustraliaThe increasing demand for resources and depletion of near ground mineral resources caused deeper mining operations under high-stress rock mass conditions. As a result of this, strain burst, which is the sudden release of stored strain energy in the surrounding rock mass, has become more prevalent and created a considerable threat to workers and construction equipment. It is, therefore, imperative to understand how strain burst mechanism and stored excess strain energy are affected due to the high confinement in deep underground conditions. For this purpose, post-peak energy distributions for brittle rocks were investigated using a newly developed energy calculation method associated with acoustic emission (AE). A series of quasi-static uniaxial and triaxial compression tests controlled by the circumferential expansion were conducted. Snap-back behaviour known as Class-II behaviour associated with energy evolution and the material response under self-sustaining failure were analysed on granites under a wide range of confining pressures (0–60 MPa). The experimental results underline that the energy evolution characteristics are strongly linked to confinement. Stored elastic strain energy (dUE), energy consumed by dominating cohesion weakening (dΦCW) and energy dissipated during mobilisation of frictional failure (dΦFM) showed a rising trend as the confining pressure was increased. An intrinsic ejection velocity was proposed to express the propensity of strain burst that was purely determined by the excess strain energy released from Class II rock.http://www.sciencedirect.com/science/article/pii/S2467967418301569Strain burstEnergy balanceClass II failure modeSelf-sustaining failureTriaxial compression testCircumferential strain control |
| spellingShingle | Selahattin Akdag Murat Karakus Giang D. Nguyen Abbas Taheri Thomas Bruning Evaluation of the propensity of strain burst in brittle granite based on post-peak energy analysis Underground Space Strain burst Energy balance Class II failure mode Self-sustaining failure Triaxial compression test Circumferential strain control |
| title | Evaluation of the propensity of strain burst in brittle granite based on post-peak energy analysis |
| title_full | Evaluation of the propensity of strain burst in brittle granite based on post-peak energy analysis |
| title_fullStr | Evaluation of the propensity of strain burst in brittle granite based on post-peak energy analysis |
| title_full_unstemmed | Evaluation of the propensity of strain burst in brittle granite based on post-peak energy analysis |
| title_short | Evaluation of the propensity of strain burst in brittle granite based on post-peak energy analysis |
| title_sort | evaluation of the propensity of strain burst in brittle granite based on post peak energy analysis |
| topic | Strain burst Energy balance Class II failure mode Self-sustaining failure Triaxial compression test Circumferential strain control |
| url | http://www.sciencedirect.com/science/article/pii/S2467967418301569 |
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