Investigation on Dynamical Mechanics, Energy Dissipation, and Microstructural Characteristics of Cemented Tailings Backfill under SHPB Tests
文献类型：期刊论文
| 作者 | Zheng, Di2,3; Song, Weidong2,3; Cao, Shuai2,3; Li, Jiajian2,3; Sun LJ(孙立娟)1
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| 刊名 | MINERALS
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| 出版日期 | 2021-05-01 |
| 卷号 | 11期号:5页码:13 |
| 关键词 | cemented tailings backfill (CTB) split Hopkinson pressure bar (SHPB) dynamical characteristics energy dissipation micro-computer tomography |
| DOI | 10.3390/min11050542 |
| 通讯作者 | Cao, Shuai(sandy_cao@ustb.edu.cn) |
| 英文摘要 | As mining depth increases, the backfill mining method is more and more widely used in underground mines. The dynamic load generated by the blasting can affect the stability of the cemented tailings backfill (CTB). The CTB samples were prepared to conduct a test of the split Hopkinson pressure bar (SHPB) to investigate the dynamic disturbance of CTB. The present paper discusses dynamical mechanics, energy dissipation, and microstructure analysis of CTB. Micro-computer tomography (micro-CT) scanning of CTB samples after the SHPB test was performed to analyze the evolution of internal cracks. The experimental results showed that when the average strain rate (ASR) increased from 30 to 98 s(-1), the dynamic uniaxial compression strength (DUCS) of the CTB showed a trend of first increasing and decreasing with the increase in ASR. The dynamic stress-strain pre-peak curve of CTB directly enters the linear elastic stage. As ASR increases, the absorbed energy of the CTB shows a trend of first increasing and then decreasing. Moreover, according to the micro-CT scanning results, the crack area of CTB accounts for about 16% of the sample near the incident bar and about 1% near the transmitted bar. The crack area ratio is exponentially related to the specimen height. These findings can provide reasonable dynamical CTB strength data selection for underground pillar mining. |
| 分类号 | 二类 |
| WOS关键词 | X-RAY CT ; STRENGTH DEVELOPMENT ; PASTE BACKFILL ; PORE STRUCTURE ; FLY-ASH ; BEHAVIOR ; EVOLUTION ; VISCOSITY ; FIBER |
| 资助项目 | National Natural Science Foundation of China[51804017] ; National Natural Science Foundation of China[51974012] ; Opening Fund of State Key Laboratory of Nonlinear Mechanics[LNM202009] ; Fundamental Research Funds for Central Universities[FRF-TP-20-001A2] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing |
| 语种 | 英语 |
| WOS记录号 | WOS:000662397700001 |
| 资助机构 | National Natural Science Foundation of China ; Opening Fund of State Key Laboratory of Nonlinear Mechanics ; Fundamental Research Funds for Central Universities |
| 其他责任者 | Cao, Shuai |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/86964]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, State Key Lab Nonlinear Mech LNM, Inst Mech, Beijing 100190, Peoples R China 2.Univ Sci & Technol Beijing, State Key Lab High Efficient Min & Safety Met Min, Minist Educ, Beijing 100083, Peoples R China; 3.Univ Sci & Technol Beijing, Sch Civil & Resources Engn, Beijing 100083, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Zheng, Di,Song, Weidong,Cao, Shuai,et al. Investigation on Dynamical Mechanics, Energy Dissipation, and Microstructural Characteristics of Cemented Tailings Backfill under SHPB Tests[J]. MINERALS,2021,11(5):13. |
| APA | Zheng, Di,Song, Weidong,Cao, Shuai,Li, Jiajian,&孙立娟.(2021).Investigation on Dynamical Mechanics, Energy Dissipation, and Microstructural Characteristics of Cemented Tailings Backfill under SHPB Tests.MINERALS,11(5),13. |
| MLA | Zheng, Di,et al."Investigation on Dynamical Mechanics, Energy Dissipation, and Microstructural Characteristics of Cemented Tailings Backfill under SHPB Tests".MINERALS 11.5(2021):13. |
入库方式： OAI收割
来源：力学研究所
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