Name
Title | ||
|---|---|---|
Laboratory Microwave (C-Band) Response of Compressive Stress With Partially Saturated Sandstone |
Abstract | ||
|---|---|---|
Many studies have confirmed that the microwave radiation of rock materials will change with compressive stress and pore water. However, how the presence of pore water in rock volume influences the stress-induced change in microwave radiation (Delta T-B) is not clear. In this study, both the air-dry and humid (partially saturated) sandstone specimens were loaded compressively and the C-band (6.9 GHz) microwave radiometer was used to investigate the change of T-B and the differences of Delta T-B. The experimental results illustrated that the presence of pore water in sandstone promotes significantly the relationship between the positive Delta T-B and the applied compressive load. On the basis of radiative transfer theory and effective dielectric constant model of multiple-phase media, we found that Delta T-B of sandstone mainly results from the compressive stress distributed on mineral grains, which is able to reduce the dielectric constant of minerals and lead to the increase of microwave radiation. For dry sandstone, the distribution of compressive stress on minerals is mainly controlled by grain contact, while for humid sandstone, the pore water plays an important role in applying uniform pressure on grain surface and reducing the dielectric constant of grains; thus, the effective dielectric constant of rock volume is sensitive to the applied loads on partially saturated specimen. This study is important for understanding the positive T-B anomalies prior to large tectonic earthquakes in condition of ground surface rock partially saturated and is valuable to uncover potential T-B anomaly related to seismic activities. |
Year | DOI | Venue |
|---|---|---|
2022 | 10.1109/TGRS.2022.3204002 | IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING |
Keywords | DocType | Volume |
Effective dielectric constant, microwave radiation, pore water, radiative transfer theory, remote sensing rock mechanics | Journal | 60 |
ISSN | Citations | PageRank |
0196-2892 | 0 | 0.34 |
References | Authors | |
0 | 6 | |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Wenfei Mao | 1 | 0 | 1.01 |
| Lixin Wu | 2 | 94 | 35.60 |
| Shanjun Liu | 3 | 0 | 0.34 |
| Zhongyin Xu | 4 | 0 | 0.34 |
| Jianwei Huang | 5 | 3643 | 260.73 |
| Xiang Gao | 6 | 0 | 0.34 |