Reverse Size Effect of the Unconfined Compressive Strength of Crystalline Rock: A Grain-Scale Perspective
文献类型：期刊论文
| 作者 | Liang, Qinyuan2; Lan, Hengxing2,3; Zhou, Yu4; Li, Bo5; Sun, Weifeng2; Liu, Shijie2; Lv, Wenjun1 |
| 刊名 | ROCK MECHANICS AND ROCK ENGINEERING
 |
| 出版日期 | 2024-11-16 |
| 卷号 | N/A |
| 关键词 | Unconfined compression test Grain-based model Reverse size effect Pre-existing joints and micro fissures Crystal strength degradation |
| DOI | 10.1007/s00603-024-04216-7 |
| 产权排序 | 2 |
| 文献子类 | Article ; Early Access |
| 英文摘要 | Due to the size effect, it is essential to first determine the mechanical parameters of experimental-scale rocks and then select appropriate models to extrapolate to the engineering scale for engineering design. Although extensive research have been conducted on the size effect of rocks, the mechanism for the observed strength reverse size effect of crystalline rock is still unclear. In this study, a series of unconfined compressive tests were conducted on the granite samples with different diameters and same slenderness ratio. Then, a grain-scale model containing joints and micro fissures was established specifically for the granite samples to capture the progressive failure behavior that contributes to the observed reverse size effect. It was verified that the numerical model can well-reproduce the observed reverse size effect, which first increases and then decreases with the increasing size. Based on the grain-scale simulation, the size effect was primarily controlled by crack propagation paths, crystal fracture strength, and the influence of pre-existing joints and micro fissures. Specifically, the ascending stage of the strength size effect was governed by the shorter crack path after crack initiation along weak planes (such as pre-existing micro fissures and weak boundaries). The occurrence of the inflection point in the strength size effect was attributed to the increased contribution of intergranular shear strength, resulting in widespread failure. After exceeding the inflection point, the strength decreased due to the localized failure along pre-existing joints. The reverse size effect of the unconfined compressive strength of crystalline rocks was explained from a grain-scale perspective.The ascending stage is attributed to the shorter crack propagation path resulting from the pre-existing fissures and few minerals.The entropy theory was used to quantify the concentration of crack distribution which is highly related to the rock reverse size effect. A quantitative method was proposed to characterize the crystal strength degradation and resulting damage.A quantitative method was proposed to characterize the crystal strength degradation and resulting damage. |
| WOS关键词 | DISCRETE ELEMENT METHOD ; BONDED-PARTICLE MODEL ; BRITTLE FAILURE ; SPECIMEN SIZE ; INTACT ROCK ; MECHANICAL-PROPERTIES ; SIMULATION ; DAMAGE ; DEFORMATION ; PARAMETERS |
| WOS研究方向 | Engineering ; Geology |
| WOS记录号 | WOS:001355673400001 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/209495]  |
| 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 | Lan, Hengxing |
| 作者单位 | 1.Jilin Univ, Coll Construct Engn, Changchun 130026, Jilin, Peoples R China 2.Changan Univ, Coll Geol Engn & Geomat, Xian 710054, Shanxi, Peoples R China 3.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing 100101, Peoples R China 4.Shaoxing Univ, Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Zhejiang, Peoples R China 5.Tongji Univ, Coll Civil Engn, Shanghai 200092, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liang, Qinyuan,Lan, Hengxing,Zhou, Yu,et al. Reverse Size Effect of the Unconfined Compressive Strength of Crystalline Rock: A Grain-Scale Perspective[J]. ROCK MECHANICS AND ROCK ENGINEERING,2024,N/A. |
| APA | Liang, Qinyuan.,Lan, Hengxing.,Zhou, Yu.,Li, Bo.,Sun, Weifeng.,...&Lv, Wenjun.(2024).Reverse Size Effect of the Unconfined Compressive Strength of Crystalline Rock: A Grain-Scale Perspective.ROCK MECHANICS AND ROCK ENGINEERING,N/A. |
| MLA | Liang, Qinyuan,et al."Reverse Size Effect of the Unconfined Compressive Strength of Crystalline Rock: A Grain-Scale Perspective".ROCK MECHANICS AND ROCK ENGINEERING N/A(2024). |
入库方式： OAI收割
来源：地理科学与资源研究所
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