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冻融循环条件下岩石核磁共振特性的试验研究 被引量:98

EXPERIMENTAL STUDY OF NMR CHARACTERISTICS IN ROCK UNDER FREEZING AND THAWING CYCLES
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摘要 为研究岩石在冻融循环作用下微观结构的变化特征,选取寒区花岗岩为试样,在冻结温度为-40℃,融解温度为20℃条件下分别进行0,10,20,30和40次冻融循环试验,并对冻融循环后的岩样进行核磁共振(NMR)测量,得到不同冻融循环次数后岩样的横向弛豫时间T2分布及核磁共振成像图像。结果表明:花岗岩的T2分布主要为3个峰,第一个峰和第二个峰的面积之和占全部峰总面积的98%以上,表明微孔隙占绝大多数;在经历10,20,30和40不同冻融循环次数后,岩石的T2谱面积发生了明显变化,孔隙率分别增大了14.0%,0.9%,16.2%和1.6%。核磁共振图像显示冻融循环后岩样的孔隙空间分布情况。冻融循环条件下岩石核磁共振特征的变化规律,为岩石冻融损伤机制研究提供可靠的试验数据。 For knowing the variation characteristic of rock microstructure under freezing and thawing cycles, the experimental study on granite sample is conducted under different freezing and thawing cycles of 0 time, 10, 20, 30 and 40 times with the freezing temperature of --40℃ and thawing temperature of 20 ℃. The nuclear magnetic resonance(NMR) is used to test the samples after freezing and thawing cycles; and the crosswise relaxation time T2 distribution and NMR imaging are obtained. The results show that: T2 distribution of granite exhibits three peaks and the subtotal spectrum area between the first peak and second peak occupies more than 98% of the total area, which means the micro pores are in the majority. After different freezing-thawing cycles of 10, 20, 30 and 40 times, the T2 spectrum area has changed obviously; and the porosity has increased by 14%, 0.9%, 16.2% and 1.6% respectively. Also, the space distributions of pores have been visually shown by the NMR imaging. The variation law of NMR characteristics in rock under freezing-thawing cycles has provided the reliable experimental results for the research works of rock damage mechanism under freezing and thawing cycles.
出处 《岩石力学与工程学报》 EI CAS CSCD 北大核心 2012年第4期731-737,共7页 Chinese Journal of Rock Mechanics and Engineering
基金 国家自然科学基金资助项目(51074178) 高等学校博士学科点专项科研基金(20090162110036)
关键词 岩石力学 冻融循环 核磁共振 花岗岩 孔隙度 弛豫时间 rock mechanics freezing and thawing cycles nuclear magnetic resonance(NMR): granite porosity relaxation time
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