岩土力学 ›› 2019, Vol. 40 ›› Issue (5): 1778-1786.doi: 10.16285/j.rsm.2018.0225

• 基础理论与实验研究 • 上一篇    下一篇

基于核磁共振技术的淤泥固化水分转化机制研究

王士权1, 2, 3，魏明俐1, 2，何星星1, 2, 3，张亭亭1, 2, 3，薛 强1, 2   

  1. 1. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，湖北 武汉 430071； 2. 中国科学院武汉岩土力学研究所 污染泥土科学与工程湖北省重点实验室，湖北 武汉 430071；3.中国科学院大学，北京 100049
  • 收稿日期:2018-02-05 出版日期:2019-05-11 发布日期:2019-06-02
  • 作者简介:王士权，男，1990年生，博士研究生，主要从事河湖淤泥安全处置及资源化利用方面的研究工作。
  • 基金资助:
    国家自然科学基金杰出青年基金（No. 51625903）；国家自然科学基金项目（No. 51609241, No. 41702349）。

Study of water transfer mechanism during sediment solidification process based on nuclear magnetic resonance technology

WANG Shi-quan1, 2, 3, WEI Ming-li1, 2, HE Xing-xing1, 2, 3, ZHANG Ting-ting1, 2, 3, XUE Qiang1, 2   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. Hubei Province Key Laboratory of Contaminated Sludge and Soil Science and Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 3. University of Chinese Academy of Sciences, Beijing, 100049, China
  • Received:2018-02-05 Online:2019-05-11 Published:2019-06-02
  • Supported by:
    This work was supported by the National Science Fund for Distinguished Young Scholars of China(51625903) and the National Nature Science Foundation of China(51609241, 41702349).

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摘要： 为了揭示淤泥固化体的微细观水分分布与工程特性的内在联系，针对水泥固化湖泊淤泥，基于柔性壁渗透、无侧限抗压及核磁共振（NMR）试验，探明淤泥固化过程中的水分转化和孔隙结构演化机制，并与固化体的渗透系数k、无侧限抗压强度 和变形模量 建立关联。试验结果表明：7 d龄期内水化反应速率快，淤泥固化体内的大量孔隙水转化成水化物中的化合水，最可几孔径减小，形成孔隙结构骨架主体，导致k值降低、 和 增大；7 d后，只有当孔隙水扩散穿透水化物膜层，水化反应才继续缓慢进行，但 和 仍大幅增长；化合水量 与lgk存在线性关系，而 - 和 - 均呈指数关系。基于微观水分参数与工程特性的量化关系模型，可充分揭示水泥固化淤泥的宏微观演化机制。

关键词: 核磁共振（NMR）, 工程特性, 水分转化, 孔隙结构

Abstract: To reveal the intrinsic correlation between the micro-meso moisture-distribution and the engineering properties of the solidified sediments, the lake sediments were solidified by cement. The mechanisms of water transfer and pore structure development in the process of sediment solidification were explored using the nuclear magnetic resonance test. The relationships of the moisture parameters with the permeability k, strength and deformation modulus of solidified specimens were investigated. The experimental results showed that the hydration rate was fast within 7 days, and the pore water in the sediment solidification transferred into hydration water. Meanwhile, the most probable pore size decreased, which caused a decrease in k and increases in and , and hence inducing the formation of the pore structure. However, after 7 days, the hydration reaction continued slowly only if the water diffused and penetrated through hydrates membrane. Significant increases in and were also observed for this case. The hydration water varied as a linear function of lgk, however, exponential relations were existed between and , and . Based on the quantified relation model between the micro moisture parameters and the engineering properties, the macro and micro evolution mechanisms of the cement solidified sediment were revealed.

Key words: nuclear magnetic resonance (NMR), engineering properties, water transfer, pore structure

中图分类号: 

  • TU 411
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