A statistical index indicating the degree and mechanical effects of grain size heterogeneity in rocks
文献类型：期刊论文
| 作者 | Han, Zhenhua2,3; Zhang, Luqing2,3; Azzam, Rafig4; Zhou, Jian1; Wang, Song2,3 |
| 刊名 | ENGINEERING GEOLOGY
 |
| 出版日期 | 2021-11-01 |
| 卷号 | 293页码:14 |
| 关键词 | Grain size heterogeneity Heterogeneity index Grain-based modelling Particle flow code Alxa granite |
| ISSN号 | 0013-7952 |
| DOI | 10.1016/j.enggeo.2021.106292 |
| 英文摘要 | Mineral grain size heterogeneity is one of the fundamental reasons leading to differences in rock mechanical behaviours. Several indices have been proposed to quantify grain size heterogeneity, however, the applicability of the existing indices is limited due to various preconditions. An improved grain size heterogeneity index H-e was proposed in this study. By comparing with the previous index, the improved index was proved to be more applicable for analysing rock mechanical properties. Through a series of grain-based model (GBM), the grain size heterogeneity effect, material heterogeneity effect and mineral content effect were further discussed. For a simple grain size heterogeneity effect, the crack initiation stress, damage stress, peak stress and crack initiation stress ratio of rock decreased linearly as the improved index H-e increased. After accounting for the material heterogeneity effect, the above characteristic stresses and elastic modulus decreased. A significant material heterogeneity effect and mineral content effect will impact the linear correlation between the rock macromechanical parameters and the H-e index. When the axial stress was low, the grain size heterogeneity had little effect on the number of microcracks, but this heterogeneity became the main factor affecting the evolution of microcracks as the axial stress increased. The number of intragrain tensile cracks increases and the number of intergrain shear cracks decreases with increasing H-e, when the axial stress reached the rock peak strength. Besides, the combined effects of material heterogeneity and mineral content may control the type and number of microcracks, further weakening the effect of grain size heterogeneity. |
| WOS关键词 | DISCRETE ELEMENT MODEL ; CRACK INITIATION ; MICROSCALE HETEROGENEITY ; BRITTLE-FRACTURE ; PARTICLE-SIZE ; FAILURE ; CALIBRATION ; SIMULATION ; STRENGTH ; SCALE |
| 资助项目 | National Natural Science Foundation of China[41972287] ; National Key Research and Development Program[2019YFC1509703] |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000696814500015 |
| 出版者 | ELSEVIER |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program ; National Key Research and Development Program ; National Key Research and Development Program ; National Key Research and Development Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program ; National Key Research and Development Program ; National Key Research and Development Program ; National Key Research and Development Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program ; National Key Research and Development Program ; National Key Research and Development Program ; National Key Research and Development Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Development Program ; National Key Research and Development Program ; National Key Research and Development Program ; National Key Research and Development Program |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/102659]  |
| 专题 | 地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室 |
| 通讯作者 | Zhang, Luqing |
| 作者单位 | 1.Beijing Univ Technol, Minist Educ, Key Lab Urban Secur & Disaster Engn, Beijing, Peoples R China 2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing, Peoples R China 4.Rhein Westfal TH Aachen, Aachen, Germany |
| 推荐引用方式 GB/T 7714 | Han, Zhenhua,Zhang, Luqing,Azzam, Rafig,et al. A statistical index indicating the degree and mechanical effects of grain size heterogeneity in rocks[J]. ENGINEERING GEOLOGY,2021,293:14. |
| APA | Han, Zhenhua,Zhang, Luqing,Azzam, Rafig,Zhou, Jian,&Wang, Song.(2021).A statistical index indicating the degree and mechanical effects of grain size heterogeneity in rocks.ENGINEERING GEOLOGY,293,14. |
| MLA | Han, Zhenhua,et al."A statistical index indicating the degree and mechanical effects of grain size heterogeneity in rocks".ENGINEERING GEOLOGY 293(2021):14. |
入库方式： OAI收割
来源：地质与地球物理研究所
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