基于核磁共振技术的疏浚淤泥固化土孔隙水含量及分布研究

doi:10.11988/ckyyb.20150689

院报 ›› 2016, Vol. 33 ›› Issue (10): 116-120.DOI: 10.11988/ckyyb.20150689

基于核磁共振技术的疏浚淤泥固化土孔隙水含量及分布研究

程福周¹,雷学文¹,孟庆山²,陈洁^1,3

1.武汉科技大学城市建设学院,武汉 430065;
2.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试验室,武汉 430071;
3.仲恺农业工程学院城市建设学院,广州 510225

收稿日期:2015-08-17 出版日期:2016-10-20 发布日期:2016-10-17
作者简介:程福周(1989-),男,湖北黄冈人,硕士研究生,主要从事湖泊环保疏浚、淤泥固化方面的研究,(电话)15671682531(电子信箱)1459024673@qq.com。
基金资助:
湖北省自然科学基金青年杰出人才项目(2011CDA105)

Pore Water Content of Solidified Dredging Silt and Its Distribution Based on Nuclear Magnetic Resonance

CHENG Fu-zhou¹, LEI Xue-wen¹, MENG Qing-shan², CHEN Jie¹^,3

1.College of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China;
2.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics,Chinese Academy of Sciences, Wuhan 430071, China;
3.College of Urban Construction, Zhongkai Universityof Agriculture and Engineering, Guangzhou 510225,China

Received:2015-08-17 Online:2016-10-20 Published:2016-10-17

摘要/Abstract

摘要： 为研究疏浚淤泥固化土中孔隙水的含量及分布规律,利用低场质子核磁共振技术探测疏浚淤泥固化土的横向弛豫时间T₂分布曲线。结果表明各水泥掺量下淤泥固化土样品的弛豫时间分布只有一个主峰,峰面积随着养护龄期的增长和水泥掺量的增大均逐渐减小,孔隙水的含量逐渐减小,并且孔隙水的减少首先是从大孔隙水分开始的,龄期的主要作用是减小大孔隙里的水分含量,而水泥不仅有利于大孔隙水分含量的减小,也有利于小孔隙水分含量的减小;随着养护龄期的增长和水泥掺量的增大,淤泥固化土的T₂分布范围变窄,分布趋向于短弛豫时间,孔隙水逐渐分布在较小的孔隙中;加权平均T₂弛豫时间随着龄期的增长先快速下降,7 d后下降的速率逐渐减小,固化土T₂总核磁信号幅值随养护龄期的变化总体呈减小趋势,速度超过7 d后减慢,这是因为淤泥固化土内部的化学反应使得水分被消耗或转化成了矿物水。研究表明核磁共振技术能较好地呈现淤泥固化过程中孔隙水含量及分布的变化规律。

关键词: 疏浚淤泥, 固化土, 核磁共振, T₂分布, 孔隙水, 弛豫时间

Abstract: Low field proton nuclear magnetic resonance(NMR) technology is used to measure the distribution of transverse relaxation time T₂ of solidified dredging silt soil to study the content and distribution law of pore water in solidified soil. Results show that there is only one main peak in the distribution of relaxation time of solidified soil samples of different cement dosages; the peak area decreases gradually with the growth of curing age and the increase of cement dosage. Pore water content decreases gradually, and the decrease first starts from big pores. The main effect of curing age is reducing the moisture content in the big pores, whereas cement is not only beneficial for reducing the moisture content in the big pores, but also the moisture in the small pores. With the growth of curing age and the increase of cement dosage, the scope of T₂distribution of solidified soil narrows and the distribution tends to short relaxation time, and pore water is distributed in smaller pores gradually. The weighted average relaxation time T₂ declines rapidly with the growth of curing age first, and the decline rate decreases gradually after 7 days. Solidified soil’s total nuclear magnetic signal amplitude of T₂ shows an overall trend of decrease with the curing age growth, and the speed slows down after 7 days; this is because the water is consumed or converted into mineral water due to internal chemical reaction in solidified soil. Nuclear magnetic resonance(NMR) technology can well present the content and distribution law of pore water in the process of solidification.

Key words: dredging silt, solidified soil, nuclear magnetic resonance, T₂distribution, pore water, relaxation time

中图分类号:

TU472.5

程福周,雷学文,孟庆山,陈洁. 基于核磁共振技术的疏浚淤泥固化土孔隙水含量及分布研究[J]. 院报, 2016, 33(10): 116-120.

CHENG Fu-zhou, LEI Xue-wen, MENG Qing-shan, CHEN Jie. Pore Water Content of Solidified Dredging Silt and Its Distribution Based on Nuclear Magnetic Resonance[J]. JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI, 2016, 33(10): 116-120.

[1]	唐逸凡, 曹小为, 李明, 崔灿, 宋林辉. 黏土中的孔压测试试验及其传递滞后机理[J]. 院报, 2024, 41(3): 110-117.
[2]	刘方, 蒋伟, 傅少君, 张国新. 水工混凝土饱水过程水分分布及冻融劣化对比[J]. 院报, 2023, 40(7): 152-157.
[3]	秦楠, 李琼, 徐博. 聚甲醛纤维高强混凝土孔隙特征及动态力学特性[J]. 院报, 2023, 40(6): 180-186.
[4]	韩启元, 徐桂中, 李明东, 翁佳兴. 间歇式真空预压处理高含水率疏浚泥模型试验[J]. 院报, 2023, 40(4): 113-118.
[5]	刘家光, 宋杨, 王清洲, 张志彬, 齐子怡. 循环荷载作用下土石混填料的蠕变模型研究[J]. 院报, 2023, 40(12): 147-153.
[6]	朱彦鹏, 王浩, 房光文, 刘东瑞, 吕玉宝. 强风化岩流态固化土压缩特性正交试验研究[J]. 院报, 2023, 40(12): 103-109,117.
[7]	黄磊, 苟青松, 韩萱, 侯泽明, 邓兴波. 基于未确知测度理论的含水层富水性评价方法[J]. 院报, 2022, 39(7): 23-28.
[8]	宋勇军, 陈佳星, 张磊涛, 任建喜, 车永新, 杨慧敏. 干湿循环作用下受荷砂岩损伤劣化特性研究[J]. 院报, 2021, 38(9): 133-140.
[9]	刘雪颖, 王永洪, 张明义, 孙绍霞, 桑松魁, 苗德滋. 粉质黏土中静力沉桩过程产生的孔压试验研究[J]. 院报, 2020, 37(8): 106-112.
[10]	张攀, 徐永福, 武孝天. 植物根系吸水对边坡稳定性的影响[J]. 院报, 2020, 37(8): 120-125.
[11]	武孝天, 李洪涛, 徐永福. 双向搅拌桩施工对桩周土体扰动分析[J]. 院报, 2020, 37(5): 127-132.
[12]	杨晶. 基于核磁共振成像的混凝土冻融损伤特征[J]. 院报, 2020, 37(4): 127-131.
[13]	张旭, 李明宝, 韦娜, 孙振国, 杨忠翰, 田东弘. 基于分形理论的饱和土孔隙水压力计算模型[J]. 院报, 2019, 36(6): 88-92.
[14]	肖洋, 彭刚, 吴聪, 乔宗耀, 马小亮. 循环孔隙水压力作用对混凝土动态抗压特性的影响[J]. 院报, 2019, 36(6): 110-115.
[15]	赵兰浩, 周超, 冯妍, 侯世超. 地震作用下孔隙水压力对边坡动力稳定性的影响[J]. 院报, 2019, 36(5): 69-74.

基于核磁共振技术的疏浚淤泥固化土孔隙水含量及分布研究

Pore Water Content of Solidified Dredging Silt and Its Distribution Based on Nuclear Magnetic Resonance

PDF

可视化

摘要/Abstract

引用本文

使用本文

相关文章 15

编辑推荐

Metrics

本文评价