基于核磁共振技术的土体冻结特征曲线试验研究

应赛; 夏晓舟; 文桃; 周凤玺; 曹亚鹏; 李国玉; 章青

doi:10.11779/CJGE20230301

基于核磁共振技术的土体冻结特征曲线试验研究 English Version

应赛^{1, 2, 3,},
夏晓舟¹,
文桃³,
周凤玺⁴,
曹亚鹏⁵,
李国玉⁵,
章青^1, ,

1.
河海大学力学与材料学院, 江苏南京 211100
2.
苏州纽迈分析仪器股份有限公司, 江苏苏州 215151
3.
长江师范学院建筑物全生命周期健康检测与灾害防治工程研究中心, 重庆 408100
4.
兰州理工大学土木工程学院, 甘肃兰州 730000
5.
中国科学院西北生态环境资源研究院冻土工程国家重点实验室, 甘肃兰州 730000

基金项目:

国家自然科学基金项目 12362032

国家自然科学基金项目 11932006

重庆市教委科技项目 KJQN202101447

重庆市教委科技项目 KJQN202201426

重庆市教委科技项目 KJQN202301401

甘肃省重点研发计划项目 23YFFA0063

甘肃省自然科学基金项目 20JR10RA472

详细信息

作者简介:
应赛(1989—)，男，博士，讲师，主要从事岩土工程方面的教学和科研工作。E-mail：yingsai35910@163.com

通讯作者:
章青, E-mail: lxzhangqing@hhu.edu.cn

中图分类号: TU445
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出版历程
- 收稿日期: 2023-04-09
- 网络出版日期: 2023-11-01
- 刊出日期: 2024-06-30

Experimental study on freezing characteristic curve of soils based on nuclear magnetic resonance technology

YING Sai^{1, 2, 3,},
XIA Xiaozhou¹,
WEN Tao³,
ZHOU Fengxi⁴,
CAO Yapeng⁵,
LI Guoyu⁵,
ZHANG Qing^1, ,

1.
College of Mechanics and Materials, Hohai University, Nanjing 211100, China
2.
Suzhou Niumag Analytical Instrument Corporation, Suzhou 215151, China
3.
Engineering Research Center for Health Monitoring in Building Life Cycle and Disaster Prevention, Yangtze Normal University, Chongqing 408100, China
4.
College of Civil Engineering, Lanzhou University of Technology, Lanzhou 730000, China
5.
State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China

摘要

摘要: 冻结特征曲线描述了土中未冻水含量随温度变化的规律，给出适用不同土质的冻结特征曲线计算模型具有重要的工程价值。利用核磁共振技术对6种土体的冻结特征曲线进行了测试，给出了描述土体冻结特征曲线的Michalowski模型参数的确定方法，分析了初始含水率和土体性质对冻结特征曲线的影响，利用Michalowski模型参数的特征对模型进行了改进。研究表明，冻结特征曲线与初始含水率无关，冻结过程中不同初始含水率土体的冻结特征曲线相同。在不考虑温度影响时，模型参数w_a近似等于土中最大结合水含量，可以作为分析和评价黏性土特性的重要指标参数。改进后的单参数Michalowski模型可实现对未冻水含量的良好预测，降低了模型的复杂性，提升了模型的实用价值，但模型的适用范围，有待验证。
- 冻结特征曲线 /
- 未冻水含量 /
- 冻结温度 /
- 核磁共振 /
- 结合水含量
Abstract: The freezing characteristic curve describes the variation of unfrozen water content with temperature in soils, and it is of engineering value to provide a model for calculating freezing characteristic curves suitable for different soil types. The freezing characteristic curves of six kinds of soils are tested by using the nuclear magnetic resonance technology, and a method for determining parameters of Michalowski model describing the freezing characteristic curves of soils is given. The influences of the initial water content and soil properties on the freezing characteristic curve are analyzed, and the model is improved by using the characteristics of Michalowski model parameters. The study shows that the freezing characteristic curve is independent of the initial water content, and that of the soils with different initial water contents is the same during the freezing process. Without considering the influences of temperature, the model parameter w_a is approximately equal to the maximum of bound water content in the soils, which can be used as an important index parameter to analyze and evaluate the characteristics of clay. The practical value is improved by the single-parameter Michalowski model as it performs well in predicting unfrozen water content with less model complexity, but the applicability of the model needs to be verified.
- freezing characteristic curve /
- unfrozen water content /
- freezing temperature /
- nuclear magnetic resonance /
- bound water content

HTML全文

图 1 Michalowski模型冻结特征曲线

Figure 1. Freezing characteristic curve of Michalowski model

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图 2 土体粒度分布曲线

Figure 2. Grain-size distribution curves of soil

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图 3 土体XRD衍射谱图

Figure 3. Spectra of XRD diffraction of soils

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图 4 不同初始含水率样品降温过程中的未冻结含水率变化曲线

Figure 4. Change curves of water content of samples with different initial water contents during cooling process

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未冻水含量 ${w_{\text{u}}}$ 与温度（T_m-T）的幂律关系

Power law relationship between unfrozen water content ${w_{\text{u}}}$ and temperature (T_m-T)

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图 6 三参数Michalowski模型的冻结特征曲线

Figure 6. Freezing characteristic curves of three-parameter Michalowski model

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图 7 模型参数与蒙脱石掺量关系曲线

Figure 7. Relationship curves between model parameters and montmorillonite content

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图 8 模型参数w_a与界限含水率指标关系曲线

Figure 8. Relationship curves between model parameter w_a and Atterberg limits

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图 9 模型参数关系曲线

Figure 9. Relationship curve between model parameters

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图 10 单参数Michalowski模型冻结特征曲线

Figure 10. Freezing characteristic curves of single-parameter Michalowski model

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图 11 利用液限计算得到的冻结特征曲线

Figure 11. Freezing characteristic curves calculated by liquid limit

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表 1 土的物理性质指标

Table 1 Physical properties of soils

土样编号	蒙脱石掺量S/%	土颗粒相对密度	塑限 ${w_{\text{P}}}$ /%	液限 ${w_{\text{L}}}$ /%	塑性指数 ${I_{\text{P}}}$
^#1	0	2.71	19.2	28.3	9
^#2	20	—	26.1	39.6	14
^#3	40	—	34.6	53.3	19
^#4	60	—	41.3	73.4	32
^#5	80	—	51.8	89.8	38
^#6	100	2.45	62.2	104.5	42

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表 2 拟合曲线参数

Table 2 Parameters of fitting curve

土体编号	斜率k	截距m	相关系数R²
^#1	-0.38	0.56	0.99
^#2	-0.28	1.01	0.97
^#3	-0.25	1.22	0.98
^#4	-0.26	1.38	0.95
^#5	-0.23	1.47	0.95
^#6	-0.24	1.58	0.98

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表 3 Michalowski模型参数表

Table 3 Parameters of Michalowski model

土体编号	w_a/%	w_b/%	a
^#1	3.58	0.99	0.18
^#2	10.09	3.99	0.15
^#3	16.32	7.19	0.15
^#4	23.75	9.53	0.13
^#5	29.58	13.48	0.13
^#6	37.38	15.94	0.12

下载: 导出CSV

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