| Autor: |
Xiaowu Zhang, Jinhai Xu, Faiz Shaikh, Lei Sun, Yue Cao |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Processes; Volume 10; Issue 7; Pages: 1367 |
| DOI: |
10.21203/rs.3.rs-1688680/v1 |
| Popis: |
Brittleness is an essential parameter to determine the deformation and failure behavior of rocks and it is useful to quantify the brittleness of rocks in numerus engineering practices. Taking the relationship between the energy evolution characteristics in the complete stress-strain curve and the brittleness of rocks under external loads into account, a novel energy-based brittleness evaluation index is proposed in this study, which redefined the dissipated proportion of ultimate elastic strain energy relative to post-peak failure energy and residual elastic strain energy. To verify the reliability and accuracy of the novel energy-based brittleness index, a series of conventional triaxial compression (CTC) tests were performed on shale specimens. The calculated results show that the novel energy-based index can precisely reflect the deformation and failure characteristic of rocks under different confining pressures. Meanwhile, the CTC tests data on six types of rocks from previous studies are used to verify the universality of the novel index. The decreasing trend of the brittleness value with increasing confining pressure indicates that the novel brittleness index can characterize various types of rocks and reveal a wide range of rock brittleness. Accordingly, the novel brittleness index proposed in the research can present more kinds of rocks and is more precise to characterize the brittleness of rock than the other existing brittleness indices. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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