土-水特征曲线与核磁共振曲线的关系

土-水特征曲线在非饱和土的研究中扮演着重要的角色，其预测方法的研究具有重要的科学意义。以武汉黏性土为研究对象，在土-水特征曲线试验和核磁共振（NMR）试验的基础上，利用Fredlund-Xing模型对试验数据进行拟合分析。结合KST模型和Young-Laplace理论，建立了基质吸力与土体中孔隙水的弛豫时间（T2）之间的理论关系式，试验结果表明该理论关系式并不能简单有效的描述基质吸力与T2值之间的实际关系。基于土-水特征曲线和NMR试验结果，建议了基质吸力与T2值之间的经验关系式，在此基础之上，给出了基于NMR曲线的不同初始干密度非饱和黏性土土-水特征曲线的预测方法。

Study of relationship between soil-water characteristic curve and NMR curve

Soil-water characteristic curve (SWCC) plays an important role in the study of unsaturated soils, and the research of prediction method of SWCC has a great scientific significance. The nuclear magnetic resonance (NMR) tests and SWCC experiments of Wuhan clay samples with different dry densities were carried out; Fredlund-Xing model was used to analyze SWCC experimental data and the complete SWCCs of total matric suction range were obtained. The theoretical relationship formula between matric suction and T2 value was established combining KST model and Young-Laplace theory. Based on the SWCC and NMR experimental results, the presented theoretical formula was tested. However, the test results show that this theoretical formula cannot effectively and simply describe the relationship between matric suction and T2 value. Through conversion and comparing analysis of SWCC and NMR experimental results, an empirical formula between matric suction and T2 value was established and testified to be rational. On this basis, a method was put forward to predict the SWCCs of unsaturated clay with different initial dry densities through NMR technique