Strength Reduction of Initial High-Stress Rock Pillars Under Different Triaxial Unloading Paths
文献类型：期刊论文
| 作者 | Wu, Wuxing; Gong, Fengqiang; Jiang, Quan; He, Lei |
| 刊名 | ROCK MECHANICS AND ROCK ENGINEERING
 |
| 出版日期 | 2023-05-01 |
| 卷号 | 56期号:5页码:3519 |
| 关键词 | Rock pillar Deep pillar failure Rockburst Strength-reduction effect Triaxial unloading paths High-stress unloading |
| ISSN号 | 0723-2632 |
| 英文摘要 | The mechanical behavior of deep rock pillars is closely related to the coupling effect of the initial high stress and the excavation-unloading process. In this study, the failure and strength characteristics of rock pillars are studied under triaxial unloading paths of three-dimensional (3D) initial high stress followed by two-dimensional (2D) stress unloading and one-dimensional (1D) stress adjustment. Two different 2D stress unloading paths were used: horizontal bidirectional sequential unloading path (YU test), and horizontal bidirectional simultaneous unloading path (TU test). The 3D initial high stresses were sigma(1) = 60 MPa, sigma(2) = sigma(3) = 10, 20, 30, 40, and 50 MPa, that were applied on cubic granite specimens (50 x 50 x 50 mm). Uniaxial compression tests are also conducted for comparison. Violent rockburst occurred in all specimens under the triaxial unloading paths. The results reveal that the peak strengths of the cubic granite specimens under the triaxial unloading paths are significantly lower than the uniaxial compressive strength, namely exhibiting a remarkable strength reduction effect, and the degree of strength reduction will increase with the increase of initial stress. Further, the specimen strengths in the TU tests are lower than those in the YU tests, which indicates that the weakening intensity effect of simultaneous unloading is greater than that of sequential unloading. The weakening mechanism of deep pillar under high-stress unloading can be expressed as that the 3D initial stress determines the strength level of the pillar, whereas the triaxial unloading path affects its weakening intensity. |
| 学科主题 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000920844300001 |
| 出版者 | SPRINGER WIEN |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/34920]  |
| 专题 | 中科院武汉岩土力学所 |
| 作者单位 | 1.Southeast University - China; Southeast University - China; 2.Chinese Academy of Sciences; Wuhan Institute of Rock & Soil Mechanics, CAS |
| 推荐引用方式 GB/T 7714 | Wu, Wuxing,Gong, Fengqiang,Jiang, Quan,et al. Strength Reduction of Initial High-Stress Rock Pillars Under Different Triaxial Unloading Paths[J]. ROCK MECHANICS AND ROCK ENGINEERING,2023,56(5):3519. |
| APA | Wu, Wuxing,Gong, Fengqiang,Jiang, Quan,&He, Lei.(2023).Strength Reduction of Initial High-Stress Rock Pillars Under Different Triaxial Unloading Paths.ROCK MECHANICS AND ROCK ENGINEERING,56(5),3519. |
| MLA | Wu, Wuxing,et al."Strength Reduction of Initial High-Stress Rock Pillars Under Different Triaxial Unloading Paths".ROCK MECHANICS AND ROCK ENGINEERING 56.5(2023):3519. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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