| Investigation on Dynamical Mechanics, Energy Dissipation, and Microstructural Characteristics of Cemented Tailings Backfill under SHPB Tests | |
Zheng, Di1,2; Song, Weidong1,2; Cao, Shuai1,2; Li, Jiajian1,2; Sun LJ(孙立娟)3
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| Corresponding Author | Cao, Shuai([email protected]) |
| Source Publication | MINERALS
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| 2021-05-01 | |
| Volume | 11Issue:5Pages:13 |
| Abstract | 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. |
| Keyword | cemented tailings backfill (CTB) split Hopkinson pressure bar (SHPB) dynamical characteristics energy dissipation micro-computer tomography |
| DOI | 10.3390/min11050542 |
| Indexed By | SCI |
| Language | 英语 |
| WOS ID | WOS:000662397700001 |
| WOS Keyword | X-RAY CT ; STRENGTH DEVELOPMENT ; PASTE BACKFILL ; PORE STRUCTURE ; FLY-ASH ; BEHAVIOR ; EVOLUTION ; VISCOSITY ; FIBER |
| WOS Research Area | Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing |
| WOS Subject | Geochemistry & Geophysics ; Mineralogy ; Mining & Mineral Processing |
| Funding Project | 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] |
| Funding Organization | National Natural Science Foundation of China ; Opening Fund of State Key Laboratory of Nonlinear Mechanics ; Fundamental Research Funds for Central Universities |
| Classification | 二类 |
| Ranking | 3+ |
| Contributor | Cao, Shuai |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/86965 |
| Collection | 非线性力学国家重点实验室 |
| Affiliation | 1.Univ Sci & Technol Beijing, Sch Civil & Resources Engn, Beijing 100083, 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.Chinese Acad Sci, State Key Lab Nonlinear Mech LNM, Inst Mech, Beijing 100190, Peoples R China |
| Recommended Citation 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.Rp_Au:Cao, Shuai |
| 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. |
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| File Name/Size | DocType | Version | Access | License | ||
| Jp2021F275.pdf（15691KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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