土工基础

›› 2017, Vol. 31 ›› Issue (2): 217-221.

• 工程实录 • 上一篇    下一篇

基于核磁共振技术的黏性土微观孔隙测试研究

王 卉1，韦昌富2，田慧会2   

  1. （1.桂林理工大学土木与建筑工程学院，广西桂林 541004； 2.中科院武汉岩土力学研究所岩土力学与国家重点实验室，武汉 430071）
  • 收稿日期:2016-04-15 修回日期:2016-04-26 出版日期:2017-04-20 发布日期:2017-05-04
  • 作者简介:王 卉(1988-)，硕士研究生，研究方向为低场核磁共振在岩土介质中水分分布含量与分布。 通讯作者：韦昌富(1965-)，博士，研究员，研究方向为多相孔隙介质介质中理论及其应用方面。
  • 基金资助:

    广西自然科学基金重大项目（No.2011GXNSFE018004）;广西自然科学基金创新科研团队项目（2012GXNSFGA060001）

Micro Structure of the Cohesive Soil using Nuclear Magnetic Resonance Technique

WANG Hui1, WEI Changfu2, TIAN Huihui2   

  1. (1.College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004;
    2.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071)
  • Received:2016-04-15 Revised:2016-04-26 Online:2017-04-20 Published:2017-05-04

摘要： 以黏性土在相同含水率不同干密度下，和相同干密度不同初始含水率条件下，进行核磁共振试验研究。通过核磁共振实验结果，从微观的角度对土体结构进行分析，探究粘黏性土体不同状态对于土体内部微观结构的影响。实验结果表明：密度较低的饱和黏土试样具有更多的大孔隙。干密度对黏土的大孔隙结构有较大影响，而初始含水率会对饱和黏土的小孔隙结构有影响。此外，通过对核磁共振测试和压汞测试的实验结果进行比对，可以看出两种测试手段，在孔隙孔径分布的探究上具有一致性，都可以反映出黏土的微观孔隙结构。

关键词: 黏性土, 核磁共振技术, 压汞测试, 孔隙结构, 孔隙分布

Abstract: In this paper, the Nuclear Magnetic Resonance (NMR) studies were conducted on the cohesive soils samples with the same moisture content but different dry density as well as the same dry density and different moisture contents. The influence of different soil states on the microstructure of the cohesive soil are investigated. The results show that the saturated cohesive soil samples with lower density have more large sized pores. The dry density has a great influence on the largesized pore structure of the cohesive soils. The initial moisture content will affect the smallsized pore structure of the saturated clay. In addition, by comparing the results of the NMR tests with the mercury intrusion porosimetry tests, it is concluded that, two different approaches lead to the similar results. Both approaches can adequately reflect the micro pore structure of the cohesive soils.

Key words: Cohesive Soils, Nuclear Magnetic Resonance (NMR), Mercury Intrusion Porosimetry, Pore Structures, Pore Size Distribution