Microstructure evolution in anisotropic tight sandstones under hydrostatic loading and unloading processes
文献类型：期刊论文
| 作者 | Li, Xiaying1,2; Shen, Haimeng1,2; Li, Qi1,2
|
| 刊名 | JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
 |
| 出版日期 | 2025-03-01 |
| 卷号 | 17期号:3页码:1528-1538 |
| 关键词 | Plastic deformation P-wave velocity Discrete element method (DEM) Cyclic loading and unloading Crack evolution |
| ISSN号 | 1674-7755 |
| DOI | 10.1016/j.jrmge.2024.02.042 |
| 英文摘要 | Preexisting cracks inside tight sandstones are one of the most important properties for controlling the mechanical and seepage behaviors. During the cyclic loading process, the rock generally exhibits obvious memorability and irreversible plastic deformation, even in the linear elastic stage. The assessment of the evolution of preexisting cracks under hydrostatic pressure loading and unloading processes is helpful in understanding the mechanism of plastic deformation. In this study, ultrasonic measurements were conducted on two tight sandstone specimens with different bedding orientations subjected to hydrostatic loading and unloading processes. The P-wave velocity was characterized by a similar response with the volumetric strain to the hydrostatic pressure and showed different strain sensitivities at different loading and unloading stages. A numerical model based on the discrete element method (DEM) was proposed to quantitatively clarify the evolution of the crack distribution under different hydrostatic pressures. The numerical model was verified by comparing the evolution of the measured P-wave velocities on two anisotropic specimens. The irreversible plastic deformation that occurred during the hydrostatic unloading stage was mainly due to the permanent closure of plastic-controlled cracks. The closure and reopening of cracks with a small aspect ratio account for the major microstructure evolution during the hydrostatic loading and unloading processes. Such evolution of microcracks is highly dependent on the stress path. The anisotropy of the crack distribution plays an important role in the magnitude and strain sensitivity of the P-wave velocity under stress conditions. The study can provide insight into the microstructure evolution during cyclic loading and unloading processes. (c) 2025 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Published 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[U2244215] ; Knowledge Innovation Program of Wuhan-Basic Research[2022010801010159] ; Major Project of Inner Mongolia Science and Technology[2021ZD0 034] |
| WOS研究方向 | Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001447953300001 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/36635]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Li, Qi |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Xiaying,Shen, Haimeng,Li, Qi. Microstructure evolution in anisotropic tight sandstones under hydrostatic loading and unloading processes[J]. JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,2025,17(3):1528-1538. |
| APA | Li, Xiaying,Shen, Haimeng,&Li, Qi.(2025).Microstructure evolution in anisotropic tight sandstones under hydrostatic loading and unloading processes.JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,17(3),1528-1538. |
| MLA | Li, Xiaying,et al."Microstructure evolution in anisotropic tight sandstones under hydrostatic loading and unloading processes".JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 17.3(2025):1528-1538. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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