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《Journal of Glaciology and Geocryology》 2004-06
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Reliability of Calibration Curves Measured byTDR in Frozen Soils Verified by NMR

DU Yang~(1, 2), CHEN Xiao-fei~(1, 2), ZHANG Yu-long~2, MA Wei~10, China;2. Shenyang Agricultural University, Shenyang Liaoning 110161, China)  
Measuring unfrozen water content in frozen soil by TDR is a new technique. It has many advantages. However, there is less experience in using the technique, and it is necessary to verify its reliability. The NMR is a mature technique in measurement of unfrozen water content in frozen soil. In this study, the freezing and thawing characteristic curves of umber soil with different initial water content were measured by TDR and NMR methods, and the reliability of the calibration curves of TDR method was verified. The result shows that the freezing and thawing characteristic curves measured by NMR and TDR is obviously different. At the same negative temperature, the unfrozen water content measured by TDR is higher than that by NMR, and the difference increases obviously with increase of initial water content. The results measured by NMR show that the initial water content has a little effect on the freezing and thawing characteristic curves. Whereas the results obtained by TDR show that the initial water content has obvious effect on the freezing and thawing characteristic curves, and the unfrozen water content increases apparently with increase of the initial water content. These results show that ice content and temperature have obvious effect on the dielectric property of frozen soil. So the intrinsic calibration curve of TDR for unfrozen soil should not be applied to the measurement of unfrozen water content in frozen soil directly.
【Fund】: 冻土工程国家重点试验室开放基金项目(SKLFSE200303);; 辽宁省博士后基金;; 国家自然科学基金项目(40272102)资助
【CateGory Index】: P642.14
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