Grain-Scale Origins of Variability in the Normal Coefficient of Restitution of Polycrystal Rocks: Numerical Insights into Velocity-Dependent Microstructural Effects
文献类型：期刊论文
| 作者 | Hu, Ning2,3; Zhang, Bei2,3; Lu, Quanzhong2,3; Lan, Hengxing1,2; Peng, Jianbing2,3 |
| 刊名 | ROCK MECHANICS AND ROCK ENGINEERING
 |
| 出版日期 | 2026-03-13 |
| 卷号 | N/A |
| 关键词 | Parameterized polycrystal rock Normal coefficient of restitution (NCOR) Mineral grain structure Impact velocity Grain texture model (GTM) |
| ISSN号 | 0723-2632 |
| DOI | 10.1007/s00603-026-05430-1 |
| 产权排序 | 3 |
| 文献子类 | Article ; Early Access |
| 英文摘要 | The variability of the normal coefficient of restitution (NCOR) of crystalline rocks poses major challenges for accurately predicting rockfall trajectories and designing protective structures. This study investigates the micromechanical mechanisms governing NCOR in parameterized polycrystal rocks through a series of two-dimensional discrete element simulations (PFC2D) based on a grain texture model (GTM) that explicitly considers grain aspect ratio, inclination angle, and specimen size. The results show that NCOR discreteness originates from intrinsic grain structure heterogeneity rather than experimental uncertainty. The maximum NCOR difference reaches 49.3%, with the influence of inclination angle exceeding that of aspect ratio. Grain geometry and orientation regulate the partitioning of elastic and inelastic energy by controlling force-chain transmission and crack propagation. The grain structure effect exhibits strong velocity dependence: it dominates in the 3-12 m/s range, but diminishes at higher velocities as macroscopic fracturing governs energy dissipation. Furthermore, the underlying mechanisms remain scale-robust across specimen sizes. These findings clarify the microscale origins of NCOR variability in parameterized polycrystal rocks under the calibrated 2D DEM framework and the investigated impact velocity range, and provide theoretical support for refined parameter selection in rockfall hazard analysis and impact-resistant design. |
| URL标识 | 查看原文 |
| WOS关键词 | PARTICLE-SIZE DISTRIBUTION ; SIMULATION ; MODEL ; IMPACT ; ANISOTROPY ; STRENGTH ; BEHAVIOR ; FRACTURE ; FAILURE ; LAC |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001713977800001 |
| 出版者 | SPRINGER WIEN |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/221198]  |
| 专题 | 资源与环境信息系统国家重点实验室_外文论文 |
| 通讯作者 | Zhang, Bei |
| 作者单位 | 1.Chinese Acad Sci, State Key Lab Resources & Environm Informat Syst, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 2.Changan Univ, Coll Geol Engn & Geomat, Xian 710054, Shaanxi, Peoples R China; 3.Changan Univ, Key Lab Western Chinas Mineral Resources & Geol En, Minist Educ, Xian 710054, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Hu, Ning,Zhang, Bei,Lu, Quanzhong,et al. Grain-Scale Origins of Variability in the Normal Coefficient of Restitution of Polycrystal Rocks: Numerical Insights into Velocity-Dependent Microstructural Effects[J]. ROCK MECHANICS AND ROCK ENGINEERING,2026,N/A. |
| APA | Hu, Ning,Zhang, Bei,Lu, Quanzhong,Lan, Hengxing,&Peng, Jianbing.(2026).Grain-Scale Origins of Variability in the Normal Coefficient of Restitution of Polycrystal Rocks: Numerical Insights into Velocity-Dependent Microstructural Effects.ROCK MECHANICS AND ROCK ENGINEERING,N/A. |
| MLA | Hu, Ning,et al."Grain-Scale Origins of Variability in the Normal Coefficient of Restitution of Polycrystal Rocks: Numerical Insights into Velocity-Dependent Microstructural Effects".ROCK MECHANICS AND ROCK ENGINEERING N/A(2026). |
入库方式： OAI收割
来源：地理科学与资源研究所
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