基于核磁共振技术的弱胶结砂岩干湿循环损伤特性研究

doi:10.13722/j.cnki.jrme.2018.1412

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摘要为研究岩石在干湿循环作用下的损伤演化规律，采用核磁共振技术对不同干湿循环条件下的弱胶结砂岩进行测试，得到岩石的T2谱分布曲线、谱峰面积及孔隙度。结果表明，随着干湿循环次数的增加，岩石T2谱曲线逐渐向右移动，但移动幅度逐渐减小；T2谱面积及孔隙度随干湿循环次数的增加逐渐增大，但其增长速率不断降低。采用孔隙度定义岩石损伤度，分析孔隙度与岩石损伤度之间的量化关系，并建立不同干湿循环次数与损伤度之间的函数关系。发现干湿循环作用对岩石的损伤程度随循环次数的增大而增加，但随着循环次数的持续增加，损伤速率不断降低，干湿循环作用对岩石的损伤程度趋于定值。

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	宋勇军
	张磊涛
	任建喜
	陈佳星
	车永新
	杨慧敏
	毕冉

关键词 ：岩石力学, 干湿循环, 核磁共振, T2谱分布, 孔隙度, 损伤度

Abstract：For the purpose of researching the damage evolution law of rock under drying-wetting cycles，the nuclear magnetic resonance(NMR) technique was used to test the weak cementation sandstone under different drying-wetting cycles，and the T2 spectrum distribution，T2 spectrum area and porosity were obtained. The results show that the T2 spectrum curve of rock moves to the right with increasing the number of drying-wetting cycles while the amplitude of the movement diminishes gradually. As the number of cycles increase，T2 spectrum area and porosity rise gradually，but the rate of the growth declines continually. The degree of rock damage is defined by the porosity. The quantitative relationship of the porosity with the rock damage was analysed，and the functional relationship between the number of drying-wetting cycles and the damage degree was established. It is shown that，with increasing the number of cycles，the damage degree to the rock caused by drying-wetting cycles increases while the damage rate decreases. The damage of rock caused by drying-wetting cycles tends to be close to a limit.

Key words： rock mechanics drying-wetting cycles nuclear magnetic resonance(NMR) T2 spectrum distribution rock porosity damage degree

引用本文:

宋勇军，张磊涛，任建喜，陈佳星，车永新，杨慧敏，毕冉. 基于核磁共振技术的弱胶结砂岩干湿循环损伤特性研究[J]. 岩石力学与工程学报, 2019, 38(4): 825-831.
SONG Yongjun，ZHANG Leitao，REN Jianxi，CHEN Jiaxing，CHE Yongxin，YANG Huimin，BI Ran. Study on damage characteristics of weak cementation sandstone under drying-wetting cycles based on nuclear magnetic resonance technique. , 2019, 38(4): 825-831.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.1412 或 http://www.rockmech.org/CN/Y2019/V38/I4/825

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