期刊
COLD REGIONS SCIENCE AND TECHNOLOGY
卷 155, 期 -, 页码 327-332出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.coldregions.2018.08.022
关键词
Freeze-thaw treatment; NMR technique; SHPB; Dynamic tensile strength; Brazilian test; Failure process
资金
- Special fund for basic research of Central South University [2017zzts190]
- National Science Foundation of China [51474252]
- National Natural Science Foundation of China Youth Fund [41502327]
The deterioration mechanism and dynamic tensile properties of rock subjected to the effects of freeze-thaw cycles are investigated in this study. Brazilian disc granite specimens are treated by 0, 30, 60, 90 and 120 freezethaw cycles. Freezing and thawing temperatures are - 20 degrees C and 20 degrees C respectively. The microscopic damage in the rock samples induced by freeze-thaw treatment is detected by the nuclear magnetic resonance (NMR) technique. T-2 spectrum and magnetic resonance imaging (MRI) are used to analyze the effect of freeze-thaw cycles on the pore structure of rock samples. Brazilian splitting tests are performed by a split Hopkinson pressure bar (SHPB) system to measure the dynamic tensile strength of granite and to investigate the effect of freeze-thaw cycles on the dynamic tensile strength and the dynamic mechanical behavior. A formula for dynamic tensile strength prediction considering loading rates and freeze-thaw cycles is presented to quantify the results. The dynamic failure process of specimen is observed by a high-speed camera, it was found that the rock materials were more susceptible to damage and deteriorate after freeze-thaw treatment compared with the untreated rock.
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