基于核磁共振技术的土体冻结特征曲线试验研究  

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

作　　者：应赛 夏晓舟[1] 文桃[3] 周凤玺[4] 曹亚鹏[5] 李国玉 章青 YING Sai;XIA Xiaozhou;WEN Tao;ZHOU Fengxi;CAO Yapeng;LI Guoyu;ZHANG Qing(College of Mechanics and Materials,Hohai University,Nanjing 211100,China;Suzhou Niumag Analytical Instrument Corporation,Suzhou 215151,China;Engineering Research Center for Health Monitoring in Building Life Cycle and Disaster Prevention,Yangtze Normal University,Chongqing 408100,China;College of Civil Engineering,Lanzhou University of Technology,Lanzhou 730000,China;State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[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

出　　处：《岩土工程学报》2024年第7期1437-1444,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(12362032,11932006);重庆市教委科技项目(KJQN202101447,KJQN202201426,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)。

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wa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。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 wa 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.

关 键 词：冻结特征曲线 未冻水含量 冻结温度 核磁共振 结合水含量 

分 类 号：TU445[建筑科学—岩土工程]