Mechanical behaviors of backfill-rock composites: Physical shear test and back-analysis
文献类型：期刊论文
| 作者 | Xin, Jie2,3; Jiang, Quan2; Gong, Fengqiang1; Liu, Lang4; Liu, Chang2,3; Liu, Qiang2; Yang, Yao2,3; Chen, Pengfei2,3 |
| 刊名 | JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
 |
| 出版日期 | 2024-03-01 |
| 卷号 | 16期号:3页码:807-827 |
| 关键词 | Physical simulation Backfill-rock composites Shear failure Cracking Shear constitutive model |
| ISSN号 | 1674-7755 |
| DOI | 10.1016/j.jrmge.2023.08.012 |
| 英文摘要 | The shear behavior of backfill-rock composites is crucial for mine safety and the management of surface subsidence. For exposing the shear failure mechanism of backfill-rock composites, we conducted shear tests on backfill-rock composites under three constant normal loads, compared with the unfilled rock. To investigate the macro- and meso-failure characteristics of the samples in the shear tests, the cracking behavior of samples was recorded by a high-speed camera and acoustic emission monitoring. In parallel with the experimental test, the numerical models of backfill-rock composites and unfilled rock were established using the discrete element method to analyze the continuous-discontinuous shearing process. Based on the damage mechanics and statistics, a novel shear constitutive model was proposed to describe mechanical behavior. The results show that backfill-rock composites had a special bimodal phenomenon of shearing load-deformation curve, i.e. the first shearing peak corresponded to rock break and the second shearing peak induced by the broken of aeolian sand-cement/fly ash paste backfill. Moreover, the shearing characteristic curves of the backfill-rock composites could be roughly divided into four stages, i.e. the shear failure of the specimens experienced: stage I: stress concentration; stage II: crack propagation; stage III: crack coalescence; stage IV: shearing friction. The numerical simulation shows that the existence of aeolian sand-cement/fly ash paste backfill inevitably altered the coalescence type and failure mode of the specimens and had a strengthening effect on the shear strength of backfillrock composites. Based on damage mechanics and statistics, a shear constitutive model was proposed to describe the shear fracture characteristics of specimens, especially the bimodal phenomenon. Finally, the micro- and meso-mechanisms of shear failure were discussed by combining the micro-test and numerical results. The research can advance the better understanding of the shear behavior of backfill-rock composites and contribute to the safety of mining engineering. (c) 2024 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/). |
| 资助项目 | National Natural Science Foundation of China[52325905] ; Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences[Z020005] |
| WOS研究方向 | Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001234764700001 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/41460]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Jiang, Quan |
| 作者单位 | 1.Southeast Univ, Sch Civil Engn, Nanjing 211189, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Xian Univ Sci & Technol, Energy Sch, Xian 710054, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xin, Jie,Jiang, Quan,Gong, Fengqiang,et al. Mechanical behaviors of backfill-rock composites: Physical shear test and back-analysis[J]. JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,2024,16(3):807-827. |
| APA | Xin, Jie.,Jiang, Quan.,Gong, Fengqiang.,Liu, Lang.,Liu, Chang.,...&Chen, Pengfei.(2024).Mechanical behaviors of backfill-rock composites: Physical shear test and back-analysis.JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,16(3),807-827. |
| MLA | Xin, Jie,et al."Mechanical behaviors of backfill-rock composites: Physical shear test and back-analysis".JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 16.3(2024):807-827. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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