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核磁共振无损检测泥岩水分迁移过程的新方法

李东阳 周星辰 刘波 张千里 刘景宇

李东阳, 周星辰, 刘波, 张千里, 刘景宇. 核磁共振无损检测泥岩水分迁移过程的新方法[J]. 矿业科学学报, 2023, 8(5): 654-662. doi: 10.19606/j.cnki.jmst.2023.05.007
引用本文: 李东阳, 周星辰, 刘波, 张千里, 刘景宇. 核磁共振无损检测泥岩水分迁移过程的新方法[J]. 矿业科学学报, 2023, 8(5): 654-662. doi: 10.19606/j.cnki.jmst.2023.05.007
Li Dongyang, Zhou Xingchen, Liu Bo, Zhang Qianli, Liu Jingyu. A new method for nondestructive testing of mudstone moisture migration process by nuclear magnetic resonance[J]. Journal of Mining Science and Technology, 2023, 8(5): 654-662. doi: 10.19606/j.cnki.jmst.2023.05.007
Citation: Li Dongyang, Zhou Xingchen, Liu Bo, Zhang Qianli, Liu Jingyu. A new method for nondestructive testing of mudstone moisture migration process by nuclear magnetic resonance[J]. Journal of Mining Science and Technology, 2023, 8(5): 654-662. doi: 10.19606/j.cnki.jmst.2023.05.007

核磁共振无损检测泥岩水分迁移过程的新方法

doi: 10.19606/j.cnki.jmst.2023.05.007
基金项目: 

国家自然科学基金 42172319

国家自然科学基金 41771083

中国矿业大学(北京)越崎青年基金 800015Z1200

详细信息
    作者简介:

    李东阳(1980— ),男,河南南阳人,博士,副教授,主要从事城市空间工程等方面的教学与研究工作。Tel:15501025827,E-mail:lidybj@163.com

  • 中图分类号: TU452

A new method for nondestructive testing of mudstone moisture migration process by nuclear magnetic resonance

  • 摘要: 利用传统方法测试岩土体内水分迁移时,往往要将原状土破碎和重塑,这会改变岩土体的结构,影响测试结果的真实性。利用核磁共振(NMR)技术具有无损测量材料中水分的特点,提出了一种新的测试方法。首先进行标定试验,将岩土试样放置在0~0.05 T的非均匀磁场中用不同的磁场强度测试,获得NMR信号量和试样水含量间的函数关系;然后对土样进行一维入渗试验与NMR测试,记录入渗时间、入渗水质量和不同位置条件下试样的NMR信号量;最后,根据标定试验所得NMR信号量与水含量之间的函数关系,计算获得试样中水分的空间分布。采用烘干法进行验证,试验结果与理论结果最大误差为4.05 %。
  • 图  1  MicroMR02-025 V核磁共振岩心分析仪

    Figure  1.  MicroMR02-025 V NMR core analyzer

    图  2  试验过程

    Figure  2.  Experimental process

    图  3  在均匀磁场与非均匀磁场中的不同位置对试样进行测试

    Figure  3.  Test the sample at different positions in the uniform and non-uniform magnetic field

    图  4  标定试样在磁场均匀和非均匀区的信号量实测值及其拟合曲线

    Figure  4.  The measured signal amplitude of the calibration sample in the uniform and non-uniform magnetic field and its fitting curve

    图  5  不同测试位置的横向弛豫时间T2的分布

    Figure  5.  Distribution of the transverse relaxation time T2 at different test positions

    图  6  信号量N的计算原理

    Figure  6.  Calculation principle of signal amplitude N

    图  7  一维入渗试验

    Figure  7.  One-dimensional infiltration experiment

    图  8  试样在各次测试中的横向弛豫时间分布

    Figure  8.  Transverse relaxation time distribution of the sample in each test

    图  9  理论信号量与实测信号量对比

    Figure  9.  Comparison between the calculated signal amplitudes and measured amplitudes

    图  10  长条形土柱中含水率的空间分布

    Figure  10.  Spatial distribution of water content in long soil column

    图  11  不同含水率时泥岩表面形态

    Figure  11.  Mudstone surface morphology with different water content

    表  1  矿物X-射线衍射分析结果

    Table  1.   Mineral X-ray diffraction analysis

    全岩矿物相对含量/% 黏土矿物相对含量/%
    石英 斜长石 微斜长石 黏土总量 I/S It Kao C
    33 9 6 52 80 15 3 2
    注:S为蒙脱石,It为伊利石,C为绿泥石,Kao为高岭石,I/S为伊蒙混层。
    下载: 导出CSV

    表  2  参数a与含水率w之间的关系

    Table  2.   The relationship between a and w

    a 5 011 4 605 4 363 4 135
    w/% 10 18 25 31
    下载: 导出CSV

    表  3  烘干泥岩试样在各测试位置的初始信号量

    Table  3.   The initial signal amplitude of dry mudstone samples at each test position

    测试位置/mm 0 8 16 24 32 40
    初始信号量 1 461 1 456 1 405 1 191 872 546
    下载: 导出CSV

    表  4  水分迁移试验数据

    Table  4.   Test data of moisture migration

    测试时间/h 试样总质量/g 试样中水的质量/g
    0 5.988 0 0
    24 6.612 0 0.624 0
    48 7.085 3 1.097 3
    72 7.496 5 1.508 5
    120 7.816 7 1.828 7
    下载: 导出CSV

    表  5  烘干法测试结果与NMR测试结果

    Table  5.   Drying method and NMR test results

    土柱分层 质量/g 烘干后试样的质量/g 土柱中水的质量/g NMR信号换算的水质量/g 误差/%
    1 1.544 4 0.989 8 0.554 6 0.577 1 4.05
    2 1.335 4 0.998 1 0.337 3 0.346 3 2.67
    3 1.263 3 0.996 0 0.267 3 0.277 0 3.64
    4 1.252 9 1.006 2 0.246 7 0.249 3 1.05
    5 1.196 8 1.002 9 0.193 9 0.199 4 2.85
    6 1.182 0 0.995 0 0.187 0 0.179 5 -3.99
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-02-04
  • 修回日期:  2023-03-30
  • 刊出日期:  2023-10-31

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