Thawing and Softening of Frozen Sandstone by Microwave Irradiation
文献类型：期刊论文
| 作者 | Han, Li1; Jia, Hailiang1; Dong, Yuanhong2,3; Wei, Yao3; Tan, Xianjun4 |
| 刊名 | ROCK MECHANICS AND ROCK ENGINEERING
 |
| 出版日期 | 2023-10-04 |
| 页码 | 17 |
| 关键词 | Microwave irradiation Frozen quartz sandstone Saturation degree Thawing and softening laws Damage mechanisms |
| ISSN号 | 0723-2632 |
| DOI | 10.1007/s00603-023-03559 |
| 英文摘要 | The strength and hardness of rock are much higher at freezing temperatures than at room temperature. This results in high excavation costs and low excavation efficiency in frozen rock layers. This study proposes a novel way to thaw porous and water-bearing rock by microwave irradiation. It is applicable to a wide range of strata and is not dependent on whether the rock contains wave-absorbing minerals. Quartz sandstone specimens free from absorbing minerals and of different saturation levels were used in an investigation of thawing and softening behaviors under microwave irradiation. The rock pore structures were observed before and after irradiation. The results show that (1) frozen quartz sandstone irradiated by microwaves undergoes three stages: (i) rapid melting of pore ice, (ii) intense vaporization of meltwater, and (iii) drying. (2) Microwave irradiation significantly reduces the strength of frozen quartz sandstone. (3) The mechanisms are vaporization expansion, which causes the propagation of intergranular cracks, and thermal expansion, which induces trans-granular cracking. (4) Softening of 40-100%-saturated frozen quartz sandstone is caused by both vapor and thermal expansion, while 0-40%-saturated sandstone is mainly affected by thermal expansion. This study provides theoretical and experimental support for microwave-assisted breakage of frozen porous and water-bearing rock. Microwave irradiation is a promising auxiliary method in excavation of frozen rock.Microwave irradiation heating melts frozen sandstone completely within only 40 s.Unfrozen water in frozen sandstone is the fundamental cause of the rapid melting.Softening effect on frozen sandstone is enhanced by increasing saturation degree. |
| 资助项目 | This work was supported by the National Natural Science Foundation of China (Grant No. 42071083) and CCCC (China Communications Construction Company. Ltd) Applied Basic Research Program (2021-ZJKJ-PTJS02).[42071083] ; National Natural Science Foundation of China[2021-ZJKJ-PTJS02] ; CCCC (China Communications Construction Company) |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001077783000002 |
| 出版者 | SPRINGER WIEN |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/39637]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Jia, Hailiang |
| 作者单位 | 1.Xian Univ Sci & Technol, Coll Architecture & Civil Engn, 58 Yanta Middle Rd, Xian 710054, Shaanxi, Peoples R China 2.Xijing Univ, Coll Civil Engn, Xian, Shaanxi, Peoples R China 3.CCCC First Highway Consultants Co LTD, State Key Lab Rd Engn Safety & Hlth Cold & High Al, Xian, Shaanxi, Peoples R China 4.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan, Hubei, Peoples R China |
| 推荐引用方式 GB/T 7714 | Han, Li,Jia, Hailiang,Dong, Yuanhong,et al. Thawing and Softening of Frozen Sandstone by Microwave Irradiation[J]. ROCK MECHANICS AND ROCK ENGINEERING,2023:17. |
| APA | Han, Li,Jia, Hailiang,Dong, Yuanhong,Wei, Yao,&Tan, Xianjun.(2023).Thawing and Softening of Frozen Sandstone by Microwave Irradiation.ROCK MECHANICS AND ROCK ENGINEERING,17. |
| MLA | Han, Li,et al."Thawing and Softening of Frozen Sandstone by Microwave Irradiation".ROCK MECHANICS AND ROCK ENGINEERING (2023):17. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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