Pore Distribution Characteristics of Thawed Residual Soils in Artificial Frozen-Wall Using NMRI and MIP Measurements
文献类型：期刊论文
| 作者 | An, Ran1,2; Kong, Lingwei1; Li, Chengsheng1,2 |
| 刊名 | APPLIED SCIENCES-BASEL
 |
| 出版日期 | 2020 |
| 卷号 | 10期号:2页码:13 |
| 关键词 | artificial ground freezing method residual soils nuclear magnetic resonance imaging freezing temperature pore distribution |
| DOI | 10.3390/app10020544 |
| 英文摘要 | Artificial ground freezing method is widely applied in the construction of metro tunnel and significantly impact the microstructure of soils in artificial frozen-walls. To delve into the pore distribution characteristics of thawed residual soils, Nuclear Magnetic Resonance Imaging (NMRI) measurements were performed to investigate the relaxation time (T-2) spectrums and T-2-weighted images of saturated samples after freezing at different temperatures. The pore volume distributions were determined from T-2 spectrums based on the surface relaxation coefficient (rho(2)) and the pore structures were visualized by T-2-weighted images. Subsequently, the pore size distribution curves from NMRI were compared and validated by mercury intrusion porosimetry (MIP) tests. According to the results, the peak areas of T-2 spectrums were linearly related to freezing temperatures in a positive manner. Pore volume distribution curves of thawed soils have two peaks, which are the major peaks with diameters of 0.5-20 mu m and the secondary peaks with diameters of 20-500 mu m. As the freezing temperature drops, the volumes of pores with different diameters all increased. The damage degree of microstructure in thawed soils increases as the temperature drops, according to the visualized pore structure. Besides, NMRI measurements of saturated soils are more accurate to reflect the full diameter range of pores, compared to MIP method. |
| 资助项目 | National Natural Science Foundation of China[11692320] ; National Natural Science Foundation of China[41372314] |
| WOS研究方向 | Chemistry ; Engineering ; Materials Science ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000522540400120 |
| 出版者 | MDPI |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/24027]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Kong, Lingwei |
| 作者单位 | 1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | An, Ran,Kong, Lingwei,Li, Chengsheng. Pore Distribution Characteristics of Thawed Residual Soils in Artificial Frozen-Wall Using NMRI and MIP Measurements[J]. APPLIED SCIENCES-BASEL,2020,10(2):13. |
| APA | An, Ran,Kong, Lingwei,&Li, Chengsheng.(2020).Pore Distribution Characteristics of Thawed Residual Soils in Artificial Frozen-Wall Using NMRI and MIP Measurements.APPLIED SCIENCES-BASEL,10(2),13. |
| MLA | An, Ran,et al."Pore Distribution Characteristics of Thawed Residual Soils in Artificial Frozen-Wall Using NMRI and MIP Measurements".APPLIED SCIENCES-BASEL 10.2(2020):13. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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