Characterization and evaluation of brittleness of deep bedded sandstone from the perspective of the whole life-cycle evolution process
The quantitative determination and evaluation of rock brittleness are crucial for the estimation of excavation efficiency and the improvement of hydraulic fracturing efficiency. Therefore, a “three-stage” triaxial loading and unloading stress path is designed and proposed. Subsequently, six brittlen...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-04-01
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| Series: | International Journal of Mining Science and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2095268623000204 |
| _version_ | 1827952947871350784 |
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| author | Zhixiang Song Junwen Zhang Yang Zhang Xukai Dong Shanyong Wang |
| author_facet | Zhixiang Song Junwen Zhang Yang Zhang Xukai Dong Shanyong Wang |
| author_sort | Zhixiang Song |
| collection | DOAJ |
| description | The quantitative determination and evaluation of rock brittleness are crucial for the estimation of excavation efficiency and the improvement of hydraulic fracturing efficiency. Therefore, a “three-stage” triaxial loading and unloading stress path is designed and proposed. Subsequently, six brittleness indexes are selected. In addition, the evolution characteristics of the six brittleness indexes selected are characterized based on the bedding effect and the effect of confining pressure. Then, the entropy weight method (EWM) is introduced to assign weight to the six brittleness indexes, and the comprehensive brittleness index Bc is defined and evaluated. Next, the new brittleness classification standard is determined, and the brittleness differences between the two stress paths are quantified. Finally, compared with the previous evaluation methods, the rationality of the proposed comprehensive brittleness index Bc is also verified. These results indicate that the proposed brittleness index Bc can reflect the brittle characteristics of deep bedded sandstone from the perspective of the whole life-cycle evolution process. Accordingly, the method proposed seems to offer reliable evaluations of the brittleness of deep bedded sandstone in deep engineering practices, although further validation is necessary. |
| first_indexed | 2024-04-09T14:06:28Z |
| format | Article |
| id | doaj.art-4dfd88b960bb43d3bbb4e514f1200e1d |
| institution | Directory Open Access Journal |
| issn | 2095-2686 |
| language | English |
| last_indexed | 2024-04-09T14:06:28Z |
| publishDate | 2023-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Mining Science and Technology |
| spelling | doaj.art-4dfd88b960bb43d3bbb4e514f1200e1d2023-05-07T04:16:35ZengElsevierInternational Journal of Mining Science and Technology2095-26862023-04-01334481502Characterization and evaluation of brittleness of deep bedded sandstone from the perspective of the whole life-cycle evolution processZhixiang Song0Junwen Zhang1Yang Zhang2Xukai Dong3Shanyong Wang4School of Energy and Mining Engineering, China University of Mining and Technology - Beijing, Beijing 100083, ChinaSchool of Energy and Mining Engineering, China University of Mining and Technology - Beijing, Beijing 100083, China; Corresponding author.School of Energy and Mining Engineering, China University of Mining and Technology - Beijing, Beijing 100083, ChinaSchool of Energy and Mining Engineering, China University of Mining and Technology - Beijing, Beijing 100083, ChinaPriority Research Centre for Geotechnical Science & Engineering, The University of Newcastle, Callaghan NSW 2308, AustraliaThe quantitative determination and evaluation of rock brittleness are crucial for the estimation of excavation efficiency and the improvement of hydraulic fracturing efficiency. Therefore, a “three-stage” triaxial loading and unloading stress path is designed and proposed. Subsequently, six brittleness indexes are selected. In addition, the evolution characteristics of the six brittleness indexes selected are characterized based on the bedding effect and the effect of confining pressure. Then, the entropy weight method (EWM) is introduced to assign weight to the six brittleness indexes, and the comprehensive brittleness index Bc is defined and evaluated. Next, the new brittleness classification standard is determined, and the brittleness differences between the two stress paths are quantified. Finally, compared with the previous evaluation methods, the rationality of the proposed comprehensive brittleness index Bc is also verified. These results indicate that the proposed brittleness index Bc can reflect the brittle characteristics of deep bedded sandstone from the perspective of the whole life-cycle evolution process. Accordingly, the method proposed seems to offer reliable evaluations of the brittleness of deep bedded sandstone in deep engineering practices, although further validation is necessary.http://www.sciencedirect.com/science/article/pii/S2095268623000204BrittlenessDeep bedded sandstoneWhole life-cycle evolution processBedding effectEffect of confining pressureEntropy weight method |
| spellingShingle | Zhixiang Song Junwen Zhang Yang Zhang Xukai Dong Shanyong Wang Characterization and evaluation of brittleness of deep bedded sandstone from the perspective of the whole life-cycle evolution process International Journal of Mining Science and Technology Brittleness Deep bedded sandstone Whole life-cycle evolution process Bedding effect Effect of confining pressure Entropy weight method |
| title | Characterization and evaluation of brittleness of deep bedded sandstone from the perspective of the whole life-cycle evolution process |
| title_full | Characterization and evaluation of brittleness of deep bedded sandstone from the perspective of the whole life-cycle evolution process |
| title_fullStr | Characterization and evaluation of brittleness of deep bedded sandstone from the perspective of the whole life-cycle evolution process |
| title_full_unstemmed | Characterization and evaluation of brittleness of deep bedded sandstone from the perspective of the whole life-cycle evolution process |
| title_short | Characterization and evaluation of brittleness of deep bedded sandstone from the perspective of the whole life-cycle evolution process |
| title_sort | characterization and evaluation of brittleness of deep bedded sandstone from the perspective of the whole life cycle evolution process |
| topic | Brittleness Deep bedded sandstone Whole life-cycle evolution process Bedding effect Effect of confining pressure Entropy weight method |
| url | http://www.sciencedirect.com/science/article/pii/S2095268623000204 |
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