Effects of thawing-induced softening on fracture behaviors of frozen rock
文献类型：期刊论文
| 作者 | Wang, Ting2; Jia, Hailiang3; Sun, Qiang2; Tan, Xianjun1; Tang, Liyun3 |
| 刊名 | JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
 |
| 出版日期 | 2024-03-01 |
| 卷号 | 16期号:3页码:979-989 |
| 关键词 | Frozen sandstone Different thawing temperature Fracture toughness Microcrack propagation process Unfrozen water content |
| ISSN号 | 1674-7755 |
| DOI | 10.1016/j.jrmge.2023.07.016 |
| 英文摘要 | Due to the presence of ice and unfrozen water in pores of frozen rock, the rock fracture behaviors are susceptible to temperature. In this study, the potential thawing-induced softening effects on the fracture behaviors of frozen rock is evaluated by testing the tension fracture toughness ( K IC ) of frozen rock at different temperatures (i.e. - 20 degrees C, - 15 degrees C, - 12 degrees C, - 10 degrees C, - 8 degrees C, - 6 degrees C, - 4 degrees C, - 2 degrees C, and 0 degrees C). Acoustic emission (AE) and digital image correlation (DIC) methods are utilized to analyze the microcrack propagation during fracturing. The melting of pore ice is measured using nuclear magnetic resonance (NMR) method. The results indicate that: (1) The K IC of frozen rock decreases moderately between - 20 degrees C and - 4 degrees C, and rapidly between - 4 degrees C and 0 degrees C. (2) At - 20 degrees C to - 4 degrees C, the fracturing process, deduced from the DIC results at the notch tip, exhibits three stages: elastic deformation, microcrack propagation and microcrack coalescence. However, at - 4 degrees C-0 degrees C, only the latter two stages are observed. (3) At - 4 degrees C-0 degrees C, the AE activities during fracturing are less than that at - 20 degrees C to - 4 degrees C, while more small events are reported. (4) The NMR results demonstrate a reverse variation trend in pore ice content with increasing temperature, that is, a moderate decrease is followed by a sharp decrease and - 4 degrees C is exactly the critical temperature. Next, we interpret the thawing-induced softening effect by linking the evolution in microscopic structure of frozen rock with its macroscopic fracture behaviors as follow: from - 20 degrees C to - 4 degrees C, the thickening of the unfrozen water film diminishes the cementation strength between ice and rock skeleton, leading to the decrease in fracture parameters. From - 4 degrees C to 0 degrees C, the cementation effect of ice almost vanishes, and the filling effect of pore ice is reduced signi ficantly, which facilitates microcrack propagation and thus the easier fracture of frozen rocks. (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[42271148] |
| WOS研究方向 | Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:001234779200001 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/41521]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Jia, Hailiang |
| 作者单位 | 1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430064, Peoples R China 2.Xian Univ Sci & Technol, Coll Geol & Environm, Xian 710054, Peoples R China 3.Xian Univ Sci & Technol, Coll Architecture & Civil Engn, Xian 710054, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, Ting,Jia, Hailiang,Sun, Qiang,et al. Effects of thawing-induced softening on fracture behaviors of frozen rock[J]. JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,2024,16(3):979-989. |
| APA | Wang, Ting,Jia, Hailiang,Sun, Qiang,Tan, Xianjun,&Tang, Liyun.(2024).Effects of thawing-induced softening on fracture behaviors of frozen rock.JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING,16(3),979-989. |
| MLA | Wang, Ting,et al."Effects of thawing-induced softening on fracture behaviors of frozen rock".JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 16.3(2024):979-989. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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