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冰川冻土 ›› 2014, Vol. 36 ›› Issue (6): 1502-1507.doi: 10.7522/j.issn.1000-0240.2014.0180

• 寒区科学与技术 • 上一篇    下一篇

缩短核磁共振测定冻土未冻水含量实验时间的方法

李东阳1, 刘波1,2, 刘念1, 马永君1, 王莉1   

  1. 1. 中国矿业大学(北京) 力学与建筑工程学院, 北京 100083;
    2. 深部岩土力学与地下工程国家重点实验室, 北京 100083
  • 收稿日期:2014-04-23 修回日期:2014-10-09 出版日期:2014-12-25 发布日期:2015-01-20
  • 作者简介:李东阳(1980-),男,河南南阳人,讲师,2011年在中国矿业大学(北京)获博士学位,现主要从事岩土工程、矿山建设工程方面的教学与研究工作.E-mail:lidybj@163.com
  • 基金资助:
    国家自然科学基金项目(51304215; 51274209); 教育部博士点基金项目(20130023120009)资助

A method to save the determining time of unfrozen water within frozen soil by nuclear magnetic resonance

LI Dongyang1, LIU Bo1,2, LIU Nian1, MA Yongjun1, WANG Li1   

  1. 1. School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China;
    2. State Key Laboratory of Geomechanics & Deep Engineering, Beijing 100083, China
  • Received:2014-04-23 Revised:2014-10-09 Online:2014-12-25 Published:2015-01-20

摘要: 为利用核磁共振(NMR)技术更快地测试得到冻土中未冻水的含量, 首先对传统的单试样测试方法进行了分析, 探究了其实验时间过长的原因. 然后, 基于传热学中的集总参数法, 研究了小体积试样在空气中以自然对流传热为冷却方式的温度变化特征. 根据试样温度与时间的对应关系, 提出了多试样连续测试法. 最后, 以一种黏土为例, 分别利用多试样连续测试法和单试样测试法测量了土样冻结过程中NMR信号强度随温度变化的关系. 实验结果表明: 二者的测量结果非常接近, 但连续测试法耗费的时间非常少. 综合比较两种利用NMR技术所耗费的时间和实验结果的精确程度, 多试样连续测试法是可行的.

关键词: 核磁共振, 未冻水, 冻土, 集总参数法

Abstract: In this article, the conventional methods of determining unfroze water within frozen soil by nuclear magnetic resonance (NMR) were analyzed to see which one able to save determining time. According to the principle and criteria of lumped parameter method in heat transfer, the temperature variation of soil specimen cooled by convection in air was analyzed. Then a new test technique named sequential determine method is presented based on the relation between time and temperature. The relations between NMR signal intensity and temperature of a type of clay-water system are obtained respectively by sequential determining method and conventional determining method. The determining results show that the difference between the two determining methods is slight, but the determining time of the former is considerable short. Comparing the determining time and accuracy between the two determining methods found that the sequential determining method is practical.

Key words: nuclear magnetic resonance (NMR), unfrozen water, frozen soil, lumped parameter method

中图分类号: 

  • P642.14