Ductile-brittle quantitative evaluation of rock based on post-peak properties under true triaxial stress
文献类型：期刊论文
| 作者 | Zheng, Zhi; Zheng, Hong; Zhao, Jun; Liu, Zaobao; Feng, Guangliang; Qiu, Shili |
| 刊名 | GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
 |
| 出版日期 | 2023-12-01 |
| 卷号 | 9期号:1 |
| ISSN号 | 2363-8419 |
| 关键词 | True triaxial test Post-peak properties Ductile-brittle behaviours 3D stress effects Quantitative qualitative evaluation method |
| 英文摘要 | To quantitatively evaluate the influence of high true three-dimensional stresses on the ductile-brittle behaviours of rock in deep underground engineering, a series of true triaxial compression tests with different stress levels were carried out on marble and four kinds of granite. The influences of true triaxial stress states (sigma(2), sigma(3)) on the post-peak characteristics were analysed, and a new normalized ductile-brittle evaluation index was proposed based on post-peak energy conversion characteristics of rock under true triaxial stresses. The ductile-brittle behaviours of rock were divided into four qualitative levels, namely, ductile-brittleness, transitional, brittleness and super-brittleness, and the influences of true triaxial stress states on the ductile-brittle behaviours of rock were quantitatively investigated. The research shows that as sigma(2) increases or sigma(3) decreases (that is, the differential stress between sigma(2) and sigma(3) increases), the brittleness of rock increases, and its increase rate gradually decreases and tends to be stable, transforming from ductile-brittleness to transitional, brittleness and super-brittleness and resulting in super-brittleness being easily induced by low-sigma(3) and high-sigma(2) conditions. When the differential stress between sigma(2) and sigma(3) is small, the intrinsic characteristics of rock itself have an obvious influence on ductile-brittle behaviours. When the differential stress between sigma(2) and sigma(3) is large, all kinds of rocks can exhibit super-brittle behaviour. The change of stress controls the evolution of rock ductile-brittle behaviours, and high-stress controls rock brittleness. The rock brittleness under true triaxial stress is significantly higher than that under conventional triaxial stress at the same sigma(3). sigma(2) induces an increase in rock brittleness and causes the decay rate of brittleness to decrease with increasing sigma(3), and sigma(2) increases the upper limit of sigma(3) for brittle failure of rock. The enhancement effect of sigma(2) on rock brittleness must be considered when evaluating the brittle failure of deep surrounding rock under high-stress conditions; otherwise, the risk of brittle failure may be underestimated. |
| 学科主题 | Energy & Fuels ; Engineering ; Geology |
| 语种 | 英语 |
| 出版者 | SPRINGER HEIDELBERG |
| WOS记录号 | WOS:001003632400001 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/35449]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.Guangxi University; 2.Chinese Academy of Sciences; Wuhan Institute of Rock & Soil Mechanics, CAS; 3.Ministry of Water Resources; Yangtze River Water Resources Protection Bureau; 4.Northeastern University - China |
| 推荐引用方式 GB/T 7714 | Zheng, Zhi,Zheng, Hong,Zhao, Jun,et al. Ductile-brittle quantitative evaluation of rock based on post-peak properties under true triaxial stress[J]. GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES,2023,9(1). |
| APA | Zheng, Zhi,Zheng, Hong,Zhao, Jun,Liu, Zaobao,Feng, Guangliang,&Qiu, Shili.(2023).Ductile-brittle quantitative evaluation of rock based on post-peak properties under true triaxial stress.GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES,9(1). |
| MLA | Zheng, Zhi,et al."Ductile-brittle quantitative evaluation of rock based on post-peak properties under true triaxial stress".GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES 9.1(2023). |
入库方式： OAI收割
来源：武汉岩土力学研究所
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